|  Relationship between Quantum and Classical Mechanics | 
In General > s.a. origin of quantum mechanics;
  quantum probabilities; quantum
  statistical mechanics [relationship with  classical]; semiclassical states.
  * Dirac's view: Classical
    mechanics is formulated using commutative quantities (c-numbers) while
    quantum mechanics requires non-commutative ones (q-numbers).
  * Formalism: Two formalisms
    that treat classical and quantum theory similarly are the phase-space
    formulation of quantum theory (possibly based on the Wigner function) and
    the Koopman-von Neumann operator approach to classical mechanics.
  * Scales: Quantum effects
    are hard to see in the macroworld, but the reason is more related with the
    way quantum systems interact with one another than with size per se.
  * Non-classical aspects: Negativity
    (the necessity of negative values in  quasiprobability representations of quantum
    states such as the Wigner representation) and contextuality; In multipartite
    systems entanglement plays a central role, but other measures of non-classicality
    in single systems can be converted into entanglement;
    > s.a. degree of classicality.
  * Issues: The study of the
    relationship between classical and quantum regimes of a theory, how the
    correspondence principle really works; The main questions are, Which states of the
    quantum theory have a classical interpretation? What predictions does the quantum
    theory make for the classical observables on them, and their fluctuations?
  * Remark: In an abstract
    mathematical sense, quantum mechanics adds a metric on phase space to the
    symplectic structure used in classical mechanics.
  @ Reviews, books: Park 90;
    Gutzwiller AJP(98)apr [interplay, RL];
    Landsman qp/05-ch;
    Arndt & Zeilinger pw(05)mar;
    Bokulich 08; Vedral SA(11)jun;
    Heller 18.
  @ General references:
    Taylor PhD(84)-a1806;
    Woo AJP(86)oct;
    Landsberg FP(88);
    't Hooft JSP(88);
    Hemion IJTP(90);
    Sibelius FP(89);
    Floyd IJMPA(00)qp/99 [trajectory representation];
    Bergeron JMP(01)qp;
    Ghose FP(02)qp/01,
    & Samal FP(02)qp/01;
    Page FP(09)qp/02;
    Bartlett & Rowe JPA(03)qp/02;
    Mittelstaedt IJTP(05)qp/02 [and quantum logic];
    Neumaier IJMPB(03)qp [axiomatic];
    Loris & Sasaki PLA(04)qp/03 [simple theorems];
    Krüger qp/04
      [quantum mechanics does not imply classical mechanics];
    Panković et al qp/04 [as phase transition];
    Curtis & Ellis EJP(06) [perturbations and probabilities];
    Dreyer JPCS(07)qp/06 [classicality];
    Khrennikov qp/06 [mathematical];
    Nikolić AIP(07)-a0707;
    Spekkens PRL(08)-a0711 [negativity and contextuality];
    de Gosson a0808,
    de Gosson & Hiley FP(11)-a1001 [common features];
    Caruso et al AP(11) [formal equivalence];
    Kisil a1204 [critique of Dirac's point of view];
    Klauder JPA(12)-a1204 [coexistence, enhanced quantization];
    't Hooft a1308-conf;
    Stoica a1402 [principle of quantumness];
    Wolfe a1409-PhD [using entanglement,
      non-locality and contextuality to distinguish quantum theory from classical mechanics and other probabilistic theories];
    de Gosson RVMP(15)-a1501 [and the metaplectic representation];
    Rosaler Topoi-a1511 ['formal' vs 'empirical' approaches];
    Zinkernagel a1603-in
      [can all systems be treated quantum-mechanically?];
    Zinkernagel SHPMP(16)-a1603 [the classical/quantum divide];
    Renkel a1701 [building a bridge].
  @ In terms of information:
    Hung a1407 [using Fisher information];
    Carcassi & Aidala IJQI-a2001 [information entropy].
  @ Classical mechanics from quantum mechanics: Bracken qp/02 [as deformation of quantum mechanics];
    Isidro et al IJGMP(09)-a0808,
    IJMPA(09)-a0808 [Ricci flow];
    Carcassi a0902 [as many-particle limit];
    Hájíček FP(09),
    JPCS(12)  [maximum-entropy packets];
    Blood a1009;
    Terekhovich a1210 [from the path integral formulation];
    Oliveira PhyA(14) [transition induced by continuous measurements];
    Hájíček JPCS(15)-a1412;
    Kastner a1707-talk [the role of distinguishability];
    Bóna a1911;
    Bru & de Siqueira Pedra a2009 [self-consistency equations].
  @ Quantum mechanics from classical mechanics:
    Heslot PRD(85);
    Ghose qp/00;
    Blasone et al PRA(05)qp/04,
    AP(05)
      [path-integral approach for 't Hooft's derivation];
    Bracken qp/06-conf [semiquantum mechanics];
    Khrennikov TMP(07)
      [quantum mechanics as approximation to classical statistical mechanics];
    Bender et al JPA(08) [quantum-like behavior of systems with complex energy];
    Wetterich a0809 [four-state system];
    Raftery et al PRX(14)-a1312 [dissipation-induced, experimental observation];
    't Hooft a2005 [Hamiltonian, with interactions].
  @ Unified descriptions: Koide et al JPCS(15)-a1412 [generalized variational principle];
    Kryukov JMP-a1912 [common Hilbert space framework];
    Nölle a2008;
    Klauder a2010.
  @ Quantum theory not from quantization:
    Isidro qp/01;
    Galapon JMP(04)qp/02.
Specific Aspects and Interpretations
  > s.a. Koopman-von Neumann formalism;
  quantum formalism [ambiguities] and foundations.
  @ Alternative / interpolating theories:  Tammaro FP(12) [non-classical, non-quantum theory];
    Massar & Patra PRA(14)-a1403 [polygon theories];
    Spekkens a1409
      [quasi-quantization and epistemic restrictions on statistical distributions];
    Fabris et al IJMPA(15)-a1509-proc [introducing quantum effects in classical theories];
    > s.a. atomic physics [classical atomic models]; classical
      mechanics [non-quantum systems]; quantum probability theory.
  @ And decoherent histories: Halliwell PRL(99)qp,
    qp/99-proc;
    Gell-Mann & Hartle PRA(14)-a1312 [adaptive coarse grainings].
  @ In Bohm / pilot-wave interpretation: Shifren et al PLA(00) [effective potential];
    Allori et al JOB(02)qp/01;
    Allori & Zanghì FP(09)qp/01-in;
    Poirier JCP(04)-a0802;
    Bowman FP(05);
    Trahan & Poirier JCP(06)-a0802,
    JCP(06)-a0802;
    Poirier & Parlant JPC(07)-a0803;
    Matzkin & Nurock SHPMP(08) [mismatch];
    Poirier JChemP(08)-a0803;
    Struyve IJMPA(20)-a1507;
    Romano a1603-in.
  @ Related topics: Greenberg et al PRL(95) [invariant tori and matrix mechanics];
    Wilkie & Brumer PRA(97),
    PRA(97) [Liouville dynamics];
    Muga et al PLA(98) [observables];
    Carcassi a1203 [homogeneous bodies and reducibility].
  > Related topics: see decoherence;
    classical limit [including correspondence principle];
    contextuality; Correspondence Principle;
    Ehrenfest Dynamics; Ehrenfest Time;
    locality [localization, localized states]; macroscopic
    systems [including coupled/hybrid classical and quantum systems]; quantum chaos;
    quantum gravity [neither classical nor quantized theory]; quantum
    statistical mechanics; Weyl Quantization.
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