|  Photons | 
In General
  > s.a. electromagnetism; history of quantum physics;
  light; photon phenomenology [propagation and effects];
  Wavelets.
  * History:
    Introduced by Planck; Used by Einstein to explain the photoelectric
    effect; Called "light quantum" by Einstein and then others until Gilbert
    N Lewis introduced the name "photon" in a 1926 letter to Nature
    (although it was for a different concept).
  * Evidence: Compton effect;
    Photoelectric effect (although photons are not necessary if one uses the
    quantum theory of electrons); More direct evidence is the fact that atoms
    recoil when emitting radiation, and they are required for accurate descriptions
    of certain processes involving fluctuations in the electromagnetic field.
  * Mass bounds:
    1975, mphoton <
    6 × 10−16 eV/c2,
    from Jupiter's B field; 1989, mphoton <
    6 × 10−16 eV/c2
    ≈ 4 × 10−51 kg, from Earth's B;
    1994, mphoton <
    3 × 10−27 eV/c2
    [?]; 1998, mphoton <
    7 × 10−17 eV/c2,
    from the Cavendish balance; Bounds are also obtained from timing of GRB pulses;
    2012, mphoton <
    4 × 10−20 eV/c2
    from black-hole superradiance instability.
  @ General references: Kragh a1401 [origin of the name];
    Rodrigues a1701 [and the Maxwell equations];
    Scully & Sargent PT(72)mar [hist, concept].
  @ Mass, observation:
    Goldhaber & Nieto RMP(71),
    RMP(10)-a0809;
    Montanet et PDG PRD(94);
    Schaefer PRL(99)ap/98
    + pn(98)mar [GRBs];
    Neyenhuis et al PRL(07)
      [proposed interferometer experiment sensitive down to 9 × 10−50 g];
    Accioly et al PLA(10) [VLBI];
    Hojman & Koch a1209;
    Qian SCPMA(12)-a1406 [using strong gravitational lensing data];
    Wu et al ApJL(16)-a1602,
    Bonetti et al PLB(16)-a1602,
    PLB(17)-a1701 [constraints from fast radio bursts];
    Zhang et al JHEA-a1607 [using GRBs];
    Wei et al RAA(17)-a1608 [radio pulsars in LMC and SMC];
    Yang & Zhang ApJ(17)-a1701 [from pulsar spindown].
  @ Mass, theory: Prokopec et al PRL(02) [generation in inflation];
    Accioly & Paszko PRD(04) [bound from light deflection];
    Pal PhyTea(05)phy/06 [history];
    Sidharth FPL(06);
    Cafaro et al AHEP(07)ht [and magnetic monopoles];
    Spavieri & Gillies G&C(10)-a1005 [electromagnetic momentum and speed of light in moving media];
    Fonseca & Vargas-Paredes BJP(10)-a1005;
    Accioly et al CQG(10),
    PRD(10)-a1012 [bounds];
    Pani et al PRL(12)-a1209 [bound from instabilities around rotating black holes];
    Diamantini et al JPA(14) [induced by vortex gauge interactions];
    > s.a. emergent gravity; modified electromagnetism;
      photon phenomenology [effective mass].
  @ Other properties: Altschul PRL(07)
    + pw(07)jul,
    APP(08)-a0711 [upper bound of 10−32e or less
      on electric charge, 10−24e·cm on magnetic moment];
    Devenish NPPS(08) [structure functions, overview];
    Hankins et al AJP(13)jun [experiment on charge upper bound];
    Heeck PRL(13)
    + news pw(13)jul [lifetime bound];
    Mielniczuk et al a1702 [anomalous magnetic moment];
    > s.a. gravitating matter [gravitational field].
  @ Classical description: Barut PLA(90) [model];
    Marshall & Santos qp/97;
    Simon et al qp/97 [photon-number distribution];
    > s.a. gas.
  > Related particles:
    see Notoph; Paraphoton;
    photon phenomenology [dark photon].
Photon States > s.a. maxwell's equations.
  @ Wave function: Inagaki PRA(98);
    Zalesny IJTP(04) [Białynicki-Birula wave function];
    Białynicki-Birula qp/05-in [rev];
    Raymer & Smith qp/06-conf;
    Lapaire & Sipe qp/06 [and interference];
    Tamburini & Vicino PRA(08)-a0807 [covariant, and QED];
    Bradler a0910 [Lorentz-invariant wave packets];
    Mohr AP(10);
    Babaei & Mostafazadeh JMP(17)-a1608 [Hilbert space];
    Kiessling & Tahvildar-Zadeh JMP(18)-a1801 [Dirac-type equation];
    Wawrzycki APPB(16)-a1810;
    Białynicki-Birula & Białynicka-Birula a1912.
  @ Wigner function: 
    Bertet et al PRL(02) [measurement, single-photon state];
    Przanowski et al FdP(21)-a2006.
  @ Single photon states: Pfleegor & Mandel PR(67) [from 2 lasers];
    Adlard et al PRL(97);
    Lvovsky et al PRL(01)qp;
    Grangier & Abram pw(03)feb;
    Oxborrow & Sinclair CP(05) [sources];
    news pn(08)mar [shortest one, 65 fs];
    Ipp et al PRL(09) [yoctosecond, GeV-scale pulses];
    Stobińska et al AQC-a1002 [interaction with single atom];
    Sangouard & Zbinden JMO(12)-a1202 [uses];
    Afzenius et al PT(15)dec
      [using atoms to store the quantum state of a photon];
    Kobakhidze a1604 [wave function, in Krein space];
    Driessen a1707 [non-locality and non-temporality];
    Baskal et al a1711-conf [spin states and helicities];
    Hoffmann a1804 [probability amplitudes];
    Hoffmann a2005 [no point-localized states].
  @ N-photon states:
    Bertet et al PRL(02) [2-photon];
    Brown et al PRA(03)qp/02;
    Czachor PLA(03)qp/02;
    Ou PRA(06)qp [temporal distribution];
    Hawton qp/06 [1- and 2-photon states];
    Gleyzes et al Nat(07)qp/06 [observing quantum jumps];
    Wu et al PLA(12)
      [coherent superposition of localized and delocalized phases];
    Ilyin OP(15)-a1406 [photon statistics and bunching effect; generalized binomial distribution];
    Leff AJP(15)apr
      [particle-number fluctuations and compressibility];
    > s.a. fock space.
  @ Photon-added and subtracted states: 
    Walschaers et al PRA(17)-a1708 [phenomenology];
    Malpani et al AdP(19)-a1904 [quantum phase properties].
  @ Other states: Wiseman & Vaccaro PRA(02)qp/99,
    PRA(02)qp/01 [stationary laser states];
    Asbóth et al PRL(05)qp/04;
    Bendjaballah PRA(06);
    Zavatta et al PRA(08)-a0803 [cavity-enhanced generation];
    VanValkenburgh JMP(09) [semiclassical];
    Park et al NJP(10)
      [experimental scheme to verify the photon commutation relations];
    Pathak & Banerji PLA(14)-a1307 [non-classicality and decoherence of binomial states];
    Coelho et al PRA(15)-a1502 [Gaussian character];
    > s.a. QED; Squeezed States.
Other Quantum Aspects > s.a. QED and modified QED;
  particle statistics; photon phenomenology;
  quantum optics; types of coherent states.
  * de Broglie relation: The relationship between
    momentum and wavelength or wave vector, p = ħk.
  * Twisted light: A technique used
    to increase the amount of information carried per photon; It involves encoding
    2.05 bits per photon by using the orbital angular momentum of light instead of
    the more commonly used polarization, which only allows one bit per photon.
  @ General references: Einstein AdP(05)
      [Rigden pw(05)apr];
    Scully & Sargent PT(72)mar;
    Clauser PRD(74) [experiment];
    Walls Nat(79)aug [evidence];
    Strnad AJP(86)jul;
    news Nat(96)apr,
    Sci(96)apr;
    Leonhardt 97;
    Kolobov RMP(99);
    Loudon 00;
    Paris PLA(01) [verification];
    Greenberger et al in(07)-a0712 [Planck, photon statistics, etc];
    Mayer a1207 [special relativity and E = hf];
    Degiorgio AJP(13)oct [correlations];
    Honegger & Rieckers 15 [3 vv];
    Parisio a1905 [deformed de Broglie relation].
  @ Against photons as physical objects: Marshall qp/02,
    Rashkovskiy QS:MF(16)-a1507 [electromagnetic waves are classical].
  @ Detection: Keyes & Kingston PT(72)mar;
    Silberhorn CP(07);
    Hawton PRA(13)-a1304 [by inertial and accelerated detectors];
    Reiserer et al Sci(13)nov-a1311 [non-destructive];
    Lebedev a1401 [and photon localization];
    Biswas & van Enk a2007 [full Hamiltonian description].
  @ Descriptions: Leonhardt 97 [states];
    Dvoeglazov in(97)phy [various],
    PS(01) [compositeness?];
    Kastner EJTP-a1312 [relationship between virtual and real photons];
    Li & Zhang a1803 [intrinsic degree of freedom];
    > s.a. particle models.
  @ Past of photons:
    Danan et al PRL(13)
    + Lundeen Phy(13)
      [past of photons passing through an interferometer];
    Sokolovski a1607,
    comment Vaidman a1703,
    reply a1704.
  @ Anderson localization: Wiersma et al Nat(97)dec
    + pn(98)jan;
    Malfliet PLA(00) [continuum version];
    Kaiser JMO(09)-a1003.
  @ Other localization:
    Tan et al PRL(91) [non-locality];
    Chiao et al SA(93)aug;
    Hardy PRL(94);
    Dotson FP(95);
    Home & Agarwal PLA(95);
    Brooke & Schroeck JMP(96) [covariant phase space localization operator];
    Keller PRP(05);
    Hawton PS(12)-a1109 [in spacetime];
    Ojima & Saigo a1507;
    > s.a. quantum locality.
  @ And information theory: focus Phy(12) [encoding and detecting information in the shape of the wave function];
    Rohde et al PRA(13) [information capacity];
    news pw(15)mar [twisted light];
    > s.a. quantum information.
  @ Spin and angular momentum: Tamburini et al a1201 [upper and lower physical limits to the determination of the orbital angular momentum];
    Sun a1407,
    Leader PLB(16)-a1510 [orbital and spin part of the angular momentum operator];
    Yang et al a2004 [expressions for operators];
    Aghapour et al a2012.
  @ Other quantum mechanics: Peres AJP(84)jul,
    FP(84);
    Paul RMP(86);
    Hawton PRA(99),
    & Baylis PRA(01) [position operator];
    Li a1601 [role of transversality condition];
    Hawton PRA(19)-a1902 [covariant quantum theory];
    Dobrski et al a2104 [position operator].
  @ QED, photon propagator: Esposito mp/05-conf;
    Lowdon PRD(17)-a1702 [non-perturbative structure].
  @ Photons with half-integer spin:
    news pw(16)may;
    Parthasarathy & Viswanathan a1605 [as q-fermions].
  @ Related topics: Ghose et al PLA(01) [Bohmian trajectories];
    Ligare & Oliveri AJP(02)jan [visualization];
    Hawton PRA(08) [Lorentz-invariant photon number density];
    Dubin et al nPhys(10)-a1002 [quantum-to-classical transition];
    Pesci a1108 [minimum wavelength];
    > s.a. bose-einstein condensation; graviton.
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