User:Guy vandegrift/Timeline of quantum mechanics

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Purpose of this document[edit]

This entire document is referenced in this permalink to Timeline of quantum mechanics, which is a permalink to the wikipedia article as of 1/9/2016. Unless otherwise stated, all statements made here are referenced in that document.

One issue is how long would it take to create a draft that could be submitted for review to Wikiversity. This draft need not correct the redlinks because that could be done after the document was accepted.

11:17, 9 January 2016 (UTC) Start work. 11:55, 9 January 2016 (UTC) Stop for a while.


This timeline of quantum mechanics shows the key steps, precursors and contributors to the development of quantum mechanics, quantum field theories and quantum chemistry.[1][2]

19th century[edit]

Image of Becquerel's photographic plate which has been fogged by exposure to radiation from a uranium salt. The shadow of a metal Maltese Cross placed between the plate and the uranium salt is clearly visible.
  • 1859 – Kirchhoff introduces the concept of a blackbody and proves that its emission spectrum depends only on its temperature.
  • 1860–1900 – Ludwig Eduard Boltzmann, James Clerk Maxwell and others develop the theory of statistical mechanics. Boltzmann argues that entropy is a measure of disorder, and also produces the first circle diagram representation, or atomic model of a molecule in terms of the overlapping terms α and β, later (in 1928) called molecular orbitals.
  • 1887 – Heinrich Hertz discovers the photoelectric effect.
  • 1888 – Hertz demonstrates experimentally that electromagnetic waves exist, as predicted by Maxwell.
  • 1888 – Johannes Rydberg modifies the Balmer formula to include all spectral series of lines for the hydrogen atom, producing the Rydberg formula which is employed later by Niels Bohr and others to verify Bohr's first quantum model of the atom.
  • 1895 – Wilhelm Conrad Röntgen discovers X-rays in experiments with electron beams in plasma.
  • 1896 – Antoine Henri Becquerel accidentally discovers radioactivity while investigating the work of Wilhelm Conrad Röntgen; he finds that uranium salts emit radiation that resembled Röntgen's X-rays in their penetrating power. In one experiment, Becquerel wraps a sample of a phosphorescent substance, potassium uranyl sulfate, in photographic plates surrounded by very thick black paper in preparation for an experiment with bright sunlight; then, to his surprise, the photographic plates are already exposed before the experiment starts, showing a projected image of his sample.
  • 1896 – Pieter Zeeman first observes the Zeeman splitting effect by passing the light emitted by hydrogen through a magnetic field.
  • 1896–1898 Marie Curie investigates uranium salt samples using a very sensitive electrometer device that was invented 15 years before by her husband and his brother Jacques Curie to measure electrical charge. She discovers that rays emitted by the uranium salt samples make the surrounding air electrically conductive. After a systematic search she finds that compounds such as uranium, emitted "Becquerel rays".
  • 1897 – Ivan Borgman demonstrates that X-rays and radioactive materials induce thermoluminescence.
  • 1899 to 1903 – While studying radioactivity Ernest Rutherford coins the terms alpha and beta rays in 1899 to describe the two distinct types of radiation emitted by thorium and uranium salts. Ernest Rutherford is joined by Frederick Soddy and together they discover nuclear transmutation when they find in 1902 that radioactive thorium is converting itself into radium through a process of nuclear decay. With his nuclear atom model of 1911 Rutherford leads the exploration of nuclear physics and becomes known as the "father of nuclear physics".

20th century[edit]


Einstein, in 1905, when he wrote the Annus Mirabilis papers
  • 1900 – To explain black-body radiation (1862), Max Planck suggests that electromagnetic energy could only be emitted in quantized form, i.e. the energy could only be a multiple of an elementary unit E = hν, where h is Planck's constant and ν is the frequency of the radiation.
  • 1902 – To explain the w:octet rule (1893), Gilbert N. Lewis develops the "w:cubical atom" theory in which electrons in the form of dots are positioned at the corner of a cube. Proposes that "covalent bonds: result when two atoms are held together by multiple pairs of electrons located between the two atoms.
  • 1904 – Richard Abegg notes the pattern that the numerical difference between the maximum positive valence, such as +6 for H2SO4, and the maximum negative valence, such as −2 for H2S, of an element tends to be eight (Abegg's rule).
  • 1905 – Albert Einstein explains the photoelectric effect, i.e. that shining light on certain materials can function to eject electrons from the material. Following Planck's quantum hypothesis (1900), he proposes that light itself consists of individual quantum particles (photons).
  • 1905 – Einstein explains the effects of Brownian motion as caused by the kinetic energy (i.e., movement) of atoms, which was subsequently, experimentally verified by Jean Baptiste Perrin, thereby settling the century-long dispute about the validity of John Dalton's atomic theory.
  • 1905 – Einstein publishes his Special Theory of Relativity.
  • 1905 – Einstein theoretically derives the equivalence of matter and energy.
  • 1907 to 1917 – To test his planetary model of 1904, Rutherford sent a beam of positively charged alpha particles onto a gold foil and noticed that some bounced back, thus showing that an atom has a small-sized positively charged atomic nucleus at its center. However, he received in 1908 the Nobel Prize in Chemistry for his study of radioactive substances, not for his planetary model of the atom; he is also widely credited with first "splitting the atom" in 1917. In 1911 Ernest Rutherford explained the Geiger–Marsden experiment using the concept of the Rutherford cross section.
  • 1909 – Geoffrey Ingram Taylor demonstrates that interference patterns of light were generated even when the light energy introduced consisted of only one photon. This discovery of the wave–particle duality of matter and energy is fundamental to the later development of quantum field theory.
  • 1909 and 1916 – Einstein shows that, if Planck's law of black-body radiation is accepted, the energy quanta must also carry momentum p = h / λ.


A schematic diagram of the apparatus for Millikan's refined oil drop experiment.
  • 1911 – Lise Meitner and Otto Hahn perform an experiment that shows that the energies of electrons emitted by beta decay had a continuous rather than discrete spectrum. This is in apparent contradiction to the law of conservation of energy, as it appeared that energy was lost in the beta decay process. A second problem is that the spin of the Nitrogen-14 atom was 1, in contradiction to the Rutherford prediction of ½. These anomalies are later explained by the discoveries of the neutrino and the neutron.
  • 1911 – Ștefan Procopiu performs experiments in which he determines the correct value of electron's magnetic dipole moment. In 1913 he is also able to calculate a theoretical value of the w:Bohr magneton based on Planck's quantum theory.
  • 1912 – Victor Hess discovers the existence of cosmic radiation.
  • 1912 – Henri Poincaré publishes an influential mathematical argument in support of the essential nature of energy quanta.
  • 1913 – Robert Andrews Millikan publishes the results of his "oil drop" experiment, in which he precisely determines the electric charge of the electron. This makes it possible to calculate the Avogadro constant and thereby to determine the atomic weight of atoms.
  • 1913 – Ștefan Procopiu publishes a theoretical paper with the correct value of the electron's magnetic dipole moment μB.
  • 1913 – Niels Bohr obtains theoretically the value of the electron's magnetic dipole moment μB as a consequence of his atom model
  • 1913 – Johannes Stark and Antonino Lo Surdo independently discover the shifting and splitting of the spectral lines of atoms and molecules due to the presence of the light source in an external static electric field.
  • 1913 – To explain the Rydberg formula (1888), which correctly modeled the light emission spectra of atomic hydrogen, Bohr hypothesizes that negatively charged electrons revolve around a positively charged nucleus at certain fixed "quantum" distances and that each of these "spherical orbits" has a specific energy associated with it such that electron movements between orbits requires "quantum" emissions or absorptions of energy.
  • 1914 – James Franck and Gustav Hertz report their experiment on electron collisions with mercury atoms, which provides a new test of Bohr's quantized model of atomic energy levels.
  • 1915 – Einstein first presents to the Prussian Academy of Science what are now known as the Einstein field equations. These equations specify how the geometry of space and time is influenced by whatever matter is present, and form the core of Einstein's General Theory of Relativity. Although this theory is not directly applicable to quantum mechanics, theorists of quantum gravity seek to reconcile them.
  • 1916 – Paul Epstein and Karl Schwarzschild, working independently, derive equations for the linear and quadratic Stark effect in hydrogen.
  • 1916 – To account for the Zeeman effect (1896), i.e. that atomic absorption or emission spectral lines change when the light source is subjected to a magnetic field, Arnold Sommerfeld suggests there might be "elliptical orbits" in atoms in addition to spherical orbits.
  • 1918 – Sir Ernest Rutherford notices that, when alpha particles are shot into nitrogen gas, his scintillation detectors shows the signatures of hydrogen nuclei. Rutherford determines that the only place this hydrogen could have come from was the nitrogen, and therefore nitrogen must contain hydrogen nuclei. He thus suggests that the hydrogen nucleus, which is known to have an atomic number of 1, is an elementary particle, which he decides must be the protons hypothesized by Eugen Goldstein.
  • 1919 – Building on the work of Lewis (1916), Irving Langmuir coins the term "covalence" and postulates that coordinate covalent bonds occur when two electrons of a pair of atoms come from both atoms and are equally shared by them, thus explaining the fundamental nature of chemical bonding and molecular chemistry.


A plaque at the University of Frankfurt commemorating the Stern–Gerlach experiment.


Electron microscope constructed by Ernst Ruska in 1933.
  • 1930 – Dirac hypothesizes the existence of the positron.[1]
  • 1930 – Dirac's textbook Principles of Quantum Mechanics is published, becoming a standard reference book that is still used today.
  • 1930 – Erich Hückel introduces the Hückel molecular orbital method, which expands on orbital theory to determine the energies of orbitals of pi electrons in conjugated hydrocarbon systems.
  • 1930 – Fritz London explains van der Waals forces as due to the interacting fluctuating dipole moments between molecules
  • 1930 – Pauli suggests in a famous letter that, in addition to electrons and protons, atoms also contain an extremely light neutral particle which he calls the "neutron." He suggests that this "neutron" is also emitted during beta decay and has simply not yet been observed. Later it is determined that this particle is actually the almost massless neutrino.[1]
  • 1931 – John Lennard-Jones proposes the Lennard-Jones interatomic potential
  • 1931 – Walther Bothe and Herbert Becker find that if the very energetic alpha particles emitted from polonium fall on certain light elements, specifically beryllium, boron, or lithium, an unusually penetrating radiation is produced. At first this radiation is thought to be gamma radiation, although it is more penetrating than any gamma rays known, and the details of experimental results are very difficult to interpret on this basis. Some scientists begin to hypothesize the possible existence of another fundamental particle.
  • 1931 – Erich Hückel redefines the property of aromaticity in a quantum mechanical context by introducing the 4n+2 rule, or Hückel's rule, which predicts whether an organic planar ring molecule will have aromatic properties.
  • 1931 – Ernst Ruska creates the first electron microscope.[1]
  • 1931 – Ernest Lawrence creates the first cyclotron and founds the Radiation Laboratory, later the Lawrence Berkeley National Laboratory; in 1939 he awarded the Nobel Prize in Physics for his work on the cyclotron.
  • 1932 – Irène Joliot-Curie and Frédéric Joliot show that if the unknown radiation generated by alpha particles falls on paraffin or any other hydrogen-containing compound, it ejects protons of very high energy. This is not in itself inconsistent with the proposed gamma ray nature of the new radiation, but detailed quantitative analysis of the data become increasingly difficult to reconcile with such a hypothesis.
  • 1932 – James Chadwick performs a series of experiments showing that the gamma ray hypothesis for the unknown radiation produced by alpha particles is untenable, and that the new particles must be the neutrons hypothesized by Fermi.[1]
  • 1932 – Werner Heisenberg applies perturbation theory to the two-electron problem to show how resonance arising from electron exchange can explain exchange forces.
  • 1932 – Mark Oliphant: Building upon the nuclear transmutation experiments of Ernest Rutherford done a few years earlier, observes fusion of light nuclei (hydrogen isotopes). The steps of the main cycle of nuclear fusion in stars are subsequently worked out by Hans Bethe over the next decade.
  • 1932 – Carl D. Anderson experimentally proves the existence of the positron.[1]
  • 1933 – Following Chadwick's experiments, Fermi renames Pauli's "neutron" to neutrino to distinguish it from Chadwick's theory of the much more massive neutron.
  • 1933 – Leó Szilárd first theorizes the concept of a nuclear chain reaction. He files a patent for his idea of a simple nuclear reactor the following year.
  • 1934 – Fermi publishes a very successful model of beta decay in which neutrinos are produced.
  • 1934 – Fermi studies the effects of bombarding uranium isotopes with neutrons.
  • 1934 – N. N. Semyonov develops the total quantitative chain chemical reaction theory, later the basis of various high technologies using the incineration of gas mixtures. The idea is also used for the description of the nuclear reaction.
  • 1934 – Irène Joliot-Curie and Frédéric Joliot-Curie discover artificial radioactivity and are jointly awarded the 1935 Nobel Prize in Chemistry[8]
  • 1935 – Einstein, Boris Podolsky, and Nathan Rosen describe the EPR paradox which challenges the completeness of quantum mechanics as it was theorized up to that time. Assuming that local realism is valid, they demonstrated that there would need to be hidden parameters to explain how measuring the quantum state of one particle could influence the quantum state of another particle without apparent contact between them.[9]
  • 1935 - Schrödinger develops the Schrödinger's cat thought experiment. It illustrates what he saw as the problems of the Copenhagen interpretation of quantum mechanics if subatomic particles can be in two contradictory quantum states at once.
  • 1935 – Hideki Yukawa formulates his hypothesis of the Yukawa potential and predicts the existence of the pion, stating that such a potential arises from the exchange of a massive scalar field, as it would be found in the field of the pion. Prior to Yukawa's paper, it was believed that the scalar fields of the fundamental forces necessitated massless particles.
  • 1936 – Alexandru Proca publishes prior to Hideki Yukawa his relativistic quantum field equations for a massive vector meson of spin-1 as a basis for nuclear forces.
  • 1936 – Garrett Birkhoff and John von Neumann introduce Quantum Logic[10] in an attempt to reconcile the apparent inconsistency of classical, Boolean logic with the Heisenberg Uncertainty Principle of quantum mechanics as applied, for example, to the measurement of complementary (noncommuting) observables in quantum mechanics, such as position and momentum;[11] current approaches to quantum logic involve noncommutative and non-associative many-valued logic.[12][13]
  • 1936 – Carl D. Anderson discovers muons while he is studying cosmic radiation.
  • 1937 – Carl Anderson experimentally proves the existence of the pion.
  • 1937 – Hermann Arthur Jahn and Edward Teller prove, using group theory, that non-linear degenerate molecules are unstable.[14] The Jahn-Teller theorem essentially states that any non-linear molecule with a degenerate electronic ground state will undergo a geometrical distortion that removes that degeneracy, because the distortion lowers the overall energy of the complex. The latter process is called the Jahn-Teller effect; this effect was recently considered also in relation to the superconductivity mechanism in YBCO and other high temperature superconductors. The details of the Jahn-Teller effect are presented with several examples and EPR data in the basic textbook by Abragam and Bleaney (1970).
  • 1938 – Charles Coulson makes the first accurate calculation of a molecular orbital wavefunction with the hydrogen molecule.
  • 1938 – Otto Hahn and his assistant Fritz Strassmann send a manuscript to Naturwissenschaften reporting they have detected the element barium after bombarding uranium with neutrons. Hahn calls this new phenomenon a 'bursting' of the uranium nucleus. Simultaneously, Hahn communicate these results to Lise Meitner. Meitner, and her nephew Otto Robert Frisch, correctly interpret these results as being a nuclear fission. Frisch confirms this experimentally on 13 January 1939.
  • 1939 – Leó Szilárd and Fermi discover neutron multiplication in uranium, proving that a chain reaction is indeed possible.


A Feynman diagram showing the radiation of a gluon when an electron and positron are annihilated.



]] particle at the bottom had not yet been observed at the time, but a particle closely matching these predictions was discovered[27] by a particle accelerator group at Brookhaven, proving Gell-Mann's theory.
  • 1961 – Clauss Jönsson performs Young's double-slit experiment (1909) for the first time with particles other than photons by using electrons and with similar results, confirming that massive particles also behaved according to the wave–particle duality that is a fundamental principle of quantum field theory.
  • 1961 – Anatole Abragam publishes the fundamental textbook on the quantum theory of Nuclear Magnetic Resonance entitled The Principles of Nuclear Magnetism;[28]
  • 1961 – Sheldon Lee Glashow extends the electroweak interaction modelss developed by Julian Schwinger by including a short range neutral current, the Z_o. The resulting symmetry structure that Glashow proposes, SU(2) X U(1), forms the basis of the accepted theory of the electroweak interactions.
  • 1962 – Leon M. Lederman, Melvin Schwartz and Jack Steinberger show that more than one type of neutrino exists by detecting interactions of the muon neutrino (already hypothesised with the name "neutretto")
  • 1962 – Murray Gell-Mann and Yuval Ne'eman independently classify the hadrons according to a system that Gell-Mann called the Eightfold Way, and which ultimately led to the quark model (1964) of hadron composition.
  • 1962 – Jeffrey Goldstone, Yoichiro Nambu, Abdus Salam, and Steven Weinberg develop what is now known as Goldstone's Theorem: if there is a continuous symmetry transformation under which the Lagrangian is invariant, then either the vacuum state is also invariant under the transformation, or there must be spinless particles of zero mass, thereafter called Nambu-Goldstone bosons.
  • 1962 to 1973 – Brian David Josephson, predicts correctly the quantum tunneling effect involving superconducting currents while he is a PhD student under the supervision of Professor Brian Pippard at the Royal Society Mond Laboratory in Cambridge, UK; subsequently, in 1964, he applies his theory to coupled superconductors. The effect is later demonstrated experimentally at Bell Labs in the USA. For his important quantum discovery he is awarded the Nobel Prize in Physics in 1973.[29]
  • 1963 – Eugene P. Wigner lays the foundation for the theory of symmetries in quantum mechanics as well as for basic research into the structure of the atomic nucleus; makes important "contributions to the theory of the atomic nucleus and the elementary particles, particularly through the discovery and application of fundamental symmetry principles"; he shares half of his Nobel prize in Physics with Maria Goeppert-Mayer and J. Hans D. Jensen.
  • 1963 – Maria Goeppert Mayer and J. Hans D. Jensen share with Eugene P. Wigner half of the Nobel Prize in Physics in 1963 "for their discoveries concerning nuclear shell structure theory".[30]
  • 1963 – Nicola Cabibbo develops the mathematical matrix by which the first two (and ultimately three) generations of quarks can be predicted.
  • 1964 – Murray Gell-Mann and George Zweig independently propose the quark model of hadrons, predicting the arbitrarily named up, down, and strange quarks. Gell-Mann is credited with coining the term quark, which he found in James Joyce's book Finnegans Wake.
  • 1964 – François Englert, Robert Brout, Peter Higgs, Gerald Guralnik, C. R. Hagen, and Tom Kibble postulate that a fundamental quantum field, now called the Higgs field, permeates space and, by way of the Higgs mechanism, provides mass to all the elementary subatomic particles that interact with it. While the Higgs field is postulated to confer mass on quarks and leptons, it represents only a tiny portion of the masses of other subatomic particles, such as protons and neutrons. In these, gluons that bind quarks together confer most of the particle mass. The result is obtained independently by three groups: François Englert and Robert Brout; Peter Higgs, working from the ideas of Philip Anderson; and Gerald Guralnik, C. R. Hagen, and Tom Kibble.[31][32][33][34][35][36][37]
  • 1964 – Sheldon Lee Glashow and James Bjorken predict the existence of the charm quark. The addition is proposed because it allows for a better description of the weak interaction (the mechanism that allows quarks and other particles to decay), equalizes the number of known quarks with the number of known leptons, and implies a mass formula that correctly reproduced the masses of the known mesons.
  • 1964 – John Stewart Bell puts forth Bell's theorem, which used testable inequality relations to show the flaws in the earlier Einstein–Podolsky–Rosen paradox and prove that no physical theory of local hidden variables can ever reproduce all of the predictions of quantum mechanics. This inaugurated the study of quantum entanglement, the phenomenon in which separate particles share the same quantum state despite being at a distance from each other.
  • 1964 – Nikolai G. Basov and Aleksandr M. Prokhorov share the Nobel Prize in Physics in 1964 for, respectively, semiconductor lasers and Quantum Electronics; they also share the prize with Charles Hard Townes, the inventor of the ammonium maser.
  • 1967 – Steven Weinberg and Abdus Salam publish a paper in which he describes Yang–Mills theory using the SU(2) X U(1) supersymmetry group, thereby yielding a mass for the W particle of the weak interaction via spontaneous symmetry breaking.
  • 1968 – Stanford University: Deep inelastic scattering experiments at the Stanford Linear Accelerator Center (SLAC) show that the proton contains much smaller, point-like objects and is therefore not an elementary particle. Physicists at the time are reluctant to identify these objects with quarks, instead calling them partons — a term coined by Richard Feynman. The objects that are observed at SLAC will later be identified as up and down quarks. Nevertheless, "parton" remains in use as a collective term for the constituents of hadrons (quarks, antiquarks, and gluons). The existence of the strange quark is indirectly validated by the SLAC's scattering experiments: not only is it a necessary component of Gell-Mann and Zweig's three-quark model, but it provides an explanation for the kaon (K) and pion (π) hadrons discovered in cosmic rays in 1947.
  • 1969 to 1977 – Sir Nevill Mott and Philip Warren Anderson publish quantum theories for electrons in non-crystalline solids, such as glasses and amorphous semiconductors; receive in 1977 a Nobel prize in Physics for their investigations into the electronic structure of magnetic and disordered systems, which allow for the development of electronic switching and memory devices in computers. The prize is shared with John Hasbrouck Van Vleck for his contributions to the understanding of the behavior of electrons in magnetic solids; he established the fundamentals of the quantum mechanical theory of magnetism and the crystal field theory (chemical bonding in metal complexes) and is regarded as the Father of modern Magnetism.
  • 1969 and 1970 – Theodor V. Ionescu, Radu Pârvan and I.C. Baianu observe and report quantum amplified stimulation of electromagnetic radiation in hot deuterium plasmas in a longitudinal magnetic field; publish a quantum theory of the amplified coherent emission of radiowaves and microwaves by focused electron beams coupled to ions in hot plasmas.
  • 1970 – Glashow, John Iliopoulos and Luciano Maiani predict the charmed quark that is subsequently found experimentally and share a Nobel prize for their theoretical prediction.


A 1974 photograph of an event in a bubble chamber at Brookhaven National Laboratory. Each track is left by a charged particle, one of which is a baryon containing the charm quark.[38]


  • 1980 to 1982 – Alain Aspect verify experimentally the quantum entanglement hypothesis; his Bell test experiments provide strong evidence that a quantum event at one location can affect an event at another location without any obvious mechanism for communication between the two locations.[46][47]
  • 1982 to 1997 – Tokamak Fusion Test Reactor (TFTR) at PPPL, Princeton, USA: Operated since 1982, produces 10.7MW of controlled fusion power for only 0.21s in 1994 by using T-D nuclear fusion in a tokamak reactor with "a toroidal 6T magnetic field for plasma confinement, a 3MA plasma current and an electron density of 1.0×1020 m−3 of 13.5 keV" [48]
  • 1983 – Carlo Rubbia and Simon van der Meer, at the Super Proton Synchrotron, see unambiguous signals of W particles in January. The actual experiments are called UA1 (led by Rubbia) and UA2 (led by Peter Jenni), and are the collaborative effort of many people. Simon van der Meer is the driving force on the use of the accelerator. UA1 and UA2 find the Z particle a few months later, in May 1983.
  • 1983 to 2011 – The largest and most powerful experimental nuclear fusion tokamak reactor in the world, Joint European Torus (JET) begins operation at Culham Facility in UK; operates with T-D plasma pulses and has a reported gain factor Q of 0.7 in 2009, with an input of 40MW for plasma heating, and a 2800-ton iron magnet for confinement;[49] in 1997 in a tritium-deuterium experiment JET produces 16 MW of fusion power, a total of 22 MJ of fusion, energy and a steady fusion power of 4 MW which is maintained for 4 seconds.[50]
  • 1985 to 2010 – The JT-60 (Japan Torus) begins operation in 1985 with an experimental D-D nuclear fusion tokamak similar to the JET; in 2010 JT-60 holds the record for the highest value of the fusion triple product achieved: 1.77×1028
    = 1.53×1021
    .;[51] JT-60 claims it would have an equivalent energy gain factor, Q of 1.25 if it were operated with a T-D plasma instead of the D-D plasma, and on May 9, 2006 attains a fusion hold time of 28.6 s in full operation; moreover, a high-power microwave gyrotron construction is completed that is capable of 1.5MW output for 1s,[52] thus meeting the conditions for the planned ITER, large-scale nuclear fusion reactor. JT-60 is disassembled in 2010 to be upgraded to a more powerful nuclear fusion reactor—the JT-60SA—by using niobium-titanium superconducting coils for the magnet confining the ultra-hot D-D plasma.
  • 1986 – Johannes Georg Bednorz and Karl Alexander Müller produce unambiguous experimental proof of high temperature superconductivity involving Jahn-Teller polarons in orthorhombic La2CuO4, YBCO and other perovskite-type oxides; promptly receive a Nobel prize in 1987 and deliver their Nobel lecture on December 8, 1987.[53]
  • 1986 – Vladimir Gershonovich Drinfeld introduces the concept of quantum groups as Hopf algebras in his seminal address on quantum theory at the International Congress of Mathematicians, and also connects them to the study of the Yang–Baxter equation, which is a necessary condition for the solvability of statistical mechanics models; he also generalizes Hopf algebras to quasi-Hopf algebras, and introduces the study of Drinfeld twists, which can be used to factorize the R-matrix corresponding to the solution of the Yang–Baxter equation associated with a quasitriangular Hopf algebra.
  • 1988 to 1998 – Mihai Gavrilă discovers in 1988 the new quantum phenomenon of atomic dichotomy in hydrogen and subsequently publishes a book on the atomic structure and decay in high-frequency fields of hydrogen atoms placed in ultra-intense laser fields.[54][55][56][57][58][59][60]
  • 1991 – Richard R. Ernst develops two-dimensional nuclear magnetic resonance spectroscopy (2D-FT NMRS) for small molecules in solution and is awarded the Nobel Prize in Chemistry in 1991 "for his contributions to the development of the methodology of high resolution nuclear magnetic resonance (NMR) spectroscopy."[61]
  • 1977 to 1995 – The top quark is finally observed by a team at Fermilab after an 18-year search. It has a mass much greater than had been previously expected — almost as great as a gold atom.
  • 1995 – Eric Cornell, Carl Wieman and Wolfgang Ketterle and co-workers at JILA create the first "pure" Bose–Einstein condensate. They do this by cooling a dilute vapor consisting of approximately two thousand rubidium-87 atoms to below 170 nK using a combination of laser cooling and magnetic evaporative cooling. About four months later, an independent effort led by Wolfgang Ketterle at MIT creates a condensate made of sodium-23. Ketterle's condensate has about a hundred times more atoms, allowing him to obtain several important results such as the observation of quantum mechanical interference between two different condensates.
  • 1998 – The Super-Kamiokande (Japan) detector facility reports experimental evidence for neutrino oscillations, implying that at least one neutrino has mass.
  • 1999 to 2013 – NSTX—The National Spherical Torus Experiment at PPPL, Princeton, USA launches a nuclear fusion project on February 12, 1999 for "an innovative magnetic fusion device that was constructed by the Princeton Plasma Physics Laboratory (PPPL) in collaboration with the Oak Ridge National Laboratory, Columbia University, and the University of Washington at Seattle"; NSTX is being used to study the physics principles of spherically shaped plasmas.[62]

21st century[edit]

Graphene is a planar atomic-scale honeycomb lattice made of carbon atoms which exhibits unusual and interesting quantum properties.

See also[edit]



  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 Peacock 2008, pp. 175–183
  2. Ben-Menahem 2009
  3. Lewis, G.N. (1926). "The conservation of photons". Nature 118 (2981): 874–875. doi:10.1038/118874a0. 
  4. P. S. Epstein, The Stark Effect from the Point of View of Schroedinger's Quantum Theory, Physical Review, vol 28, pp. 695-710 (1926)
  5. John von Neumann. 1932. The Mathematical Foundations of Quantum Mechanics., Princeton University Press: Princeton, New Jersey, reprinted in 1955, 1971 and 1983 editions
  6. Peter, F.; Weyl, H. (1927). "Die Vollständigkeit der primitiven Darstellungen einer geschlossenen kontinuierlichen Gruppe". Math. Ann. 97: 737–755. doi:10.1007/BF01447892. 
  7. Brauer, Richard; Weyl, Hermann (1935). "Spinors in n dimensions". American Journal of Mathematics (The Johns Hopkins University Press) 57 (2): 425–449. doi:10.2307/2371218. 
  8. Frédéric Joliot-Curie (December 12, 1935). "Chemical evidence of the transmutation of elements" (PDF). Nobel Lecture. Retrieved April 2012. Check date values in: |accessdate= (help)
  9. Einstein A, Podolsky B, Rosen N; Podolsky; Rosen (1935). "Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?". Phys. Rev. 47 (10): 777–780. doi:10.1103/PhysRev.47.777. 
  10. Birkhoff, Garrett and von Neumann, J. (1936). "The Logic of Quantum Mechanics". Annals of Mathematics 37 (4): 823–843. doi:10.2307/1968621. 
  11. Roland Omnès (8 March 1999). Understanding Quantum Mechanics. Princeton University Press. ISBN 978-0-691-00435-8. Retrieved 17 May 2012.
  12. Dalla Chiara, M. L.; Giuntini, R. (1994). "Unsharp quantum logics". Foundations of Physics 24 (8): 1161–1177. doi:10.1007/BF02057862. 
  13. Georgescu, G. (2006). "N-valued Logics and Łukasiewicz-Moisil Algebras". Axiomathes 16 (1–2): 123. doi:10.1007/s10516-005-4145-6. 
  14. H. Jahn and E. Teller (1937). "Stability of Polyatomic Molecules in Degenerate Electronic States. I. Orbital Degeneracy". Proceedings of the Royal Society A 161 (905): 220–235. doi:10.1098/rspa.1937.0142. 
  15. Dyson, F. (1949). "The S Matrix in Quantum Electrodynamics". Phys. Rev. 75 (11): 1736. doi:10.1103/PhysRev.75.1736. 
  16. Stix, Gary (October 1999). "Infamy and honor at the Atomic Café: Edward Teller has no regrets about his contentious career". Scientific American: 42–43. Retrieved April 2012. 
  17. Hans A. Bethe (May 28, 1952). MEMORANDUM ON THE HISTORY OF THERMONUCLEAR PROGRAM (Report). Reconstructed version from only partially declassified documents, with certain words deliberately deleted.
  18. Bloch, F.; Hansen, W.; Packard, Martin (1946). "Nuclear Induction". Physical Review 69 (3–4): 127. doi:10.1103/PhysRev.69.127. 
  19. Bloch, F.; Jeffries, C. (1950). "A Direct Determination of the Magnetic Moment of the Proton in Nuclear Magnetons". Physical Review 80 (2): 305. doi:10.1103/PhysRev.80.305. 
  20. Bloch, F. (1946). "Nuclear Induction". Physical Review 70 (7–8): 460. doi:10.1103/PhysRev.70.460. 
  21. Gutowsky, H. S.; Kistiakowsky, G. B.; Pake, G. E.; Purcell, E. M. (1949). "Structural Investigations by Means of Nuclear Magnetism. I. Rigid Crystal Lattices". The Journal of Chemical Physics 17 (10): 972. doi:10.1063/1.1747097. 
  22. Gardner, J.; Purcell, E. (1949). "A Precise Determination of the Proton Magnetic Moment in Bohr Magnetons". Physical Review 76 (8): 1262. doi:10.1103/PhysRev.76.1262.2. 
  23. Carver, T. R.; Slichter, C. P. (1953). "Polarization of Nuclear Spins in Metals". Physical Review 92 (1): 212–213. doi:10.1103/PhysRev.92.212.2. 
  24. Hugh Everett Theory of the Universal Wavefunction, Thesis, Princeton University, (1956, 1973), pp 1–140
  25. Everett, Hugh (1957). "Relative State Formulation of Quantum Mechanics". Reviews of Modern Physics 29 (3): 454–462. doi:10.1103/RevModPhys.29.454. 
  26. Jacek W. Hennel, Jacek Klinowski (2005). "Magic Angle Spinning: A Historical Perspective". In Jacek Klinowski. New techniques in solid-state NMR. Topics in Current Chemistry. 246. Springer. pp. 1–14. doi:10.1007/b98646. ISBN 3-540-22168-9.  (Template:Google books)
  27. V.E. Barnes et al.; Connolly, P.; Crennell, D.; Culwick, B.; Delaney, W.; Fowler, W.; Hagerty, P.; Hart, E. et al. (1964). "Observation of a Hyperon with Strangeness Number Three". Physical Review Letters 12 (8): 204. doi:10.1103/PhysRevLett.12.204. 
  28. Anatole Abragam (1961). The Principles of Nuclear Magnetism. Oxford: Clarendon Press. OCLC 242700.
  29. Brian David Josephson (December 12, 1973). "The Discovery of Tunnelling Supercurrents" (PDF). Nobel Lecture. Retrieved April 2012. Check date values in: |accessdate= (help)
  30. Maria Goeppert Mayer (December 12, 1963). "The shell model" (PDF). Nobel Lecture. Retrieved April 2012. Check date values in: |accessdate= (help)
  31. F. Englert, R. Brout; Brout (1964). "Broken Symmetry and the Mass of Gauge Vector Mesons". Physical Review Letters 13 (9): 321–323. doi:10.1103/PhysRevLett.13.321. 
  32. P.W. Higgs (1964). "Broken Symmetries and the Masses of Gauge Bosons". Physical Review Letters 13 (16): 508–509. doi:10.1103/PhysRevLett.13.508. 
  33. G.S. Guralnik, C.R. Hagen, T.W.B. Kibble; Hagen; Kibble (1964). "Global Conservation Laws and Massless Particles". Physical Review Letters 13 (20): 585–587. doi:10.1103/PhysRevLett.13.585. 
  34. G.S. Guralnik (2009). "The History of the Guralnik, Hagen and Kibble development of the Theory of Spontaneous Symmetry Breaking and Gauge Particles". International Journal of Modern Physics A 24 (14): 2601–2627. doi:10.1142/S0217751X09045431. 
  35. T.W.B. Kibble (2009). "Englert–Brout–Higgs–Guralnik–Hagen–Kibble mechanism". Scholarpedia 4 (1): 6441. doi:10.4249/scholarpedia.6441. 
  36. M. Blume, S. Brown, Y. Millev (2008). "Letters from the past, a PRL retrospective (1964)". Physical Review Letters. Retrieved 2010-01-30.CS1 maint: Multiple names: authors list (link)
  37. "J. J. Sakurai Prize Winners". American Physical Society. 2010. Retrieved 2010-01-30.
  38. "Discovery of the Charmed Baryon". Brookhaven History. Brookhaven National Laboratory.
  39. Wilczek, Frank (1999). "Quantum field theory". Reviews of Modern Physics 71 (2): S85. doi:10.1103/RevModPhys.71.S85. 
  40. Mansfield, P; Grannell, P K (1973). "NMR 'diffraction' in solids?". Journal of Physics C: Solid State Physics 6 (22): L422. doi:10.1088/0022-3719/6/22/007. 
  41. Garroway, A N; Grannell, P K; Mansfield, P (1974). "Image formation in NMR by a selective irradiative process". Journal of Physics C: Solid State Physics 7 (24): L457. doi:10.1088/0022-3719/7/24/006. 
  42. Mansfield, P.; Maudsley, A. A. (1977). "Medical imaging by NMR". British Journal of Radiology 50 (591): 188–94. doi:10.1259/0007-1285-50-591-188. PMID 849520. 
  43. Mansfield, P (1977). "Multi-planar image formation using NMR spin echoes". Journal of Physics C: Solid State Physics 10 (3): L55. doi:10.1088/0022-3719/10/3/004. 
  44. Ilya Prigogine (8 December 1977). "Time, Structure and Fluctuations" (PDF). Nobel lecture. Retrieved April 2012. Check date values in: |accessdate= (help)
  45. Rubinson, K.A.; Rubinson, Kenneth A.; Patterson, John (1979). "Ferromagnetic resonance and spin wave excite journals in metallic glasses". J. Phys. Chem. Solids 40 (12): 941–950. doi:10.1016/0022-3697(79)90122-7. 
  46. Aspect, Alain; Grangier, Philippe; Roger, Gérard (1982). "Experimental Realization of Einstein-Podolsky-Rosen-Bohm Gedankenexperiment: A New Violation of Bell's Inequalities". Physical Review Letters 49 (2): 91. doi:10.1103/PhysRevLett.49.91. 
  47. Aspect, Alain; Dalibard, Jean; Roger, Gérard (1982). "Experimental Test of Bell's Inequalities Using Time- Varying Analyzers". Physical Review Letters 49 (25): 1804. doi:10.1103/PhysRevLett.49.1804. 
  48. TFTR Machine Parameters. (1996-05-10). Retrieved on 2012-05-17.
  49. JET's Main Features-EFDA JET. Retrieved on 2012-05-17.
  50. European JET website. (PDF) . Retrieved on 2012-05-17.
  51. Japan Atomic Energy Agency. Naka Fusion Institute
  52. Fusion Plasma Research (FPR), JASEA, Naka Fusion Institute. Retrieved on 2012-05-17.
  53. Müller, KA; Bednorz, JG (1987). "The discovery of a class of high-temperature superconductors". Science 237 (4819): 1133–9. doi:10.1126/science.237.4819.1133. PMID 17801637. 
  54. Pont, M.; Walet, N.R.; Gavrila, M.; McCurdy, C.W. (1988). "Dichotomy of the Hydrogen Atom in Superintense, High-Frequency Laser Fields". Physical Review Letters 61 (8): 939–942. doi:10.1103/PhysRevLett.61.939. PMID 10039473. 
  55. Pont, M.; Walet, N.; Gavrila, M. (1990). "Radiative distortion of the hydrogen atom in superintense, high-frequency fields of linear polarization". Physical Review A 41 (1): 477–494. doi:10.1103/PhysRevA.41.477. PMID 9902891. 
  56. Mihai Gavrila: Atomic Structure and Decay in High-Frequency Fields, in Atoms in Intense Laser Fields, ed. M. Gavrila, Academic Press, San Diego, 1992, pp. 435–510. ISBN 0-12-003901-X
  57. Muller, H.; Gavrila, M. (1993). "Light-Induced Excited States in H". Physical Review Letters 71 (11): 1693–1696. doi:10.1103/PhysRevLett.71.1693. PMID 10054474. 
  58. Wells, J.C.; Simbotin, I.; Gavrila, M. (1998). "Physical Reality of Light-Induced Atomic States". Physical Review Letters 80 (16): 3479–3482. doi:10.1103/PhysRevLett.80.3479. 
  59. Ernst, E; van Duijn, M. Gavrila; Muller, H.G. (1996). "Multiply Charged Negative Ions of Hydrogen Induced by Superintense Laser Fields". Physical Review Letters 77 (18): 3759–3762. doi:10.1103/PhysRevLett.77.3759. PMID 10062301. 
  60. Shertzer, J.; Chandler, A.; Gavrila, M. (1994). "H2+ in Superintense Laser Fields: Alignment and Spectral Restructuring". Physical Review Letters 73 (15): 2039–2042. doi:10.1103/PhysRevLett.73.2039. PMID 10056956. 
  61. Richard R. Ernst (December 9, 1992). "Nuclear Magnetic Resonance Fourier Transform (2D-FT) Spectroscopy" (PDF). Nobel Lecture. Retrieved April 2012. Check date values in: |accessdate= (help)
  62. PPPL, Princeton, USA. (1999-02-12). Retrieved on 2012-05-17.
  63. "Lene Hau". Retrieved 2013-01-30.
  64. Leonid Vainerman (2003). Locally Compact Quantum Groups and Groupoids: Proceedings of the Meeting of Theoretical Physicists and Mathematicians, Strasbourg, February 21–23, 2002. Walter de Gruyter. pp. 247–. ISBN 978-3-11-020005-8. Retrieved 17 May 2012.
  65. LTX EXperiment Achieves First Plasma (at PPPL). Retrieved on 2012-05-17.
  66. Aspect, A. (2007). "To be or not to be local". Nature 446 (7138): 866–867. doi:10.1038/446866a. PMID 17443174. 
  67. "Coherent Population". Defense Procurement News. 2010-06-22. Retrieved 2013-01-30.
  68. Markoff, John (29 May 2014). "Scientists Report Finding Reliable Way to Teleport Data". New York Times. Retrieved 29 May 2014.
  69. Pfaff, W. (29 May 2014). "Unconditional quantum teleportation between distant solid-state quantum bits". Science (journal). doi:10.1126/science.1253512. Retrieved 29 May 2014. 


  • Peacock, Kent A. (2008). The quantum revolution : a historical perspective. Westport, Conn.: Greenwood Press. ISBN 9780313334481. 
  • Ben-Menahem, A. (2009). "Historical timeline of quantum mechanics 1925–1989". Historical encyclopedia of natural and mathematical sciences (1st ed.). Berlin: Springer. pp. 4342–4349. ISBN 9783540688310.