|  Entanglement Entropy for Various Types of Systems | 
Systems on Different Types of Backgrounds
  > s.a. quantum entropy [spacetime form].
  @ Different dimensionalities:
    Casini & Huerta NPB(07) [2+1 dimensions];
    Hubeny & Rangamani JHEP(08)-a0711 [1+1 dimensions, disjoint intervals];
    Braunstein & Das JHEP(13)-a1110 [Rényi entropy, in all dimensions];
    Godet & Marteau a1908 [gravitation from the first law of entanglement].
  @ Fields in black-hole backgrounds:
    't Hooft NPB(85);
    Bombelli et al PRD(86);
    Srednicki PRL(93)ht;
    Holzhey et al NPB(94);
    Donnelly PRD(08)-a0802 [in lqg];
    > s.a. black holes and information.
  @ Fields in other curved spacetimes: Berger & Buniy JHEP(08)-a0801 [scalar field in arbitrary curved spacetime];
    Bak PLB(13);
    Saravani et al CQG(14)-a1311,
    Mallayya et al PRD(14) [scalar field in 1+1 dimensions];
    Hollands et al JMP(18)-a1711 [widely separated regions].
    @ In cosmology: Engelhardt & Horowitz JHEP(13)-a1303 [gauge theory near cosmological singularities];
    Bianchi et al IJMPD(15)-a1512-GRF [in the primordial universe];
    Khlebnikov & Sheoran a1907 [scalar field in a transition from de Sitter to flat space].
  @ Matter-gravity entanglement: Kay ht/98,
    CQG(98)ht [and decoherence].
  > Related topics: see
    cosmological acceleration; gravitational
    entropy; fields on causal set backgrounds.
Different Types of Fields and States
  > s.a. entanglement entropy; Polymer Quantization.
  @ General references: Varadarajan GRG(16)-a1602 [free quantum field in a coherent state, and gravity];
    Radičević a1606 [and duality];
    Ardenghi IJMPA(18)-a1802 [between real and virtual excitations].
  @ Scalar fields: Lohmayer et al PLB(10) [massless, in a sphere in flat spacetime];
    Hertzberg JPA(13)-a1209;
    Rabideau JHEP(15)-a1502 [non-local, weakly coupled];
    Bianchi et al PRD(15)-a1507 [squeezed vacua on a lattice].
  @ Fermion fields:
    Larsen & Wilczek AP(95);
    Lévay et al PRA(05)qp;
    Gioev & Klich PRL(06)qp/05 [various dimensions, scaling and Widom conjecture];
    Wolf PRL(06)qp/05,
    Barthel et al PRL(06) [scaling];
    Cramer et al PRL(07)qp/06;
    Swingle PRL(10)-a0908 [and the Fermi surface];
    Helling & Spitzer FdP(10)-a1002-proc [area-law violation];
    Shaghoulian JHEP(12)-a1112 [theories with a Fermi surface];
    Herzog & Nishioka JHEP(13)-a1301 [massive fermion on a torus];
    Ossipov PRL(14)-a1404 [and Anderson's orthogonality catastrophe];
    Pastur & Slavin PRL(14)-a1408 [disordered free fermions];
    Leschke et al JPA(16)-a1501 [free Fermi gas];
    Gavrilik & Mishchenko a1504 [composite fermions, vs composite bosons];
    Fries & Reyes a1906 [chiral fermions on the circle];
    > s.a. dirac quantum field theory.
  @ Spin models: Its & Korepin JSP(09)-a0906 [XY spin chain];
    Alba et al JSM(09)-a0909 [XY and XXZ spin chains];
    Fagotti & Calabrese JSM(10)-a1003 [disjoint blocks in XY chains];
    Vitagliano et al NJP(10)-a1003 [violation of area-law scaling];
    Kallin et al PRB(11)-a1107 [square-lattice Heisenberg model];
    Pichler et al NJP(13)-a1302 [spinful fermionic atoms in an optical lattice, thermal vs entanglement entropy];
    Movassagh & Shor PNAS(16)-a1408 [violation of area-law scaling];
    Brehm & Brunner a1505 [2D Ising model].
  @ QED: Donnelly & Wall PRD(16)-a1506 [electromagnetic field];
    Berges et al JHEP(18)-a1712 [2D Schwinger model, Gaussian states];
    Pretko JHEP(18)-a1801.
  @ Gauge fields: Donnelly PRD(12)-a1109 [lattice gauge theory];
    Casini et al PRD(14)-a1312;
    Casini & Huerta PRD(14)-a1406 [Maxwell fields, 2D lattice];
    Donnelly CQG(14)-a1406 [non-abelian lattice gauge theories];
    Ghosh et al JHEP(15)-a1501,
    Aoki et al a1502 [lattice gauge theory];
    Soni & Trivedi JHEP(16)-a1510;
    Agarwal et al PRD(17)-a1701 [using gauge-invariant variables];
    Moitra et al a1811 [classical and quantum terms, and duality].
  @ Higher-spin fields: Datta et al PRD(14)-a1405;
    Hijano & Kraus JHEP(14)-a1406 [and the first law];
    Long JHEP(14)-a1408.
  @ Quantum gravity:
    Ma a1609;
    Arzano & Calcagni EPJC(17)-a1704 [and spectral dimension];
    Feller & Livine CQG(18)-a1710 [in lqg];
    Pagani & Reuter JHEP(18)-a1804 [finite in asymptotically safe quantum gravity];
    Speranza a1808-PhD.
  @ Coupled oscillators: 
    Han et al cm/97;
    Nakagawa a1601.
  @ Other systems: Cramer et al PRA(06)qp/05 [bosonic lattices, scaling];
    Solodukhin PLB(10)-a1008 [round spheres];
    Puttarprom et al a1302 [particle coupled to a lattice];
    Lello et al JHEP(13)-a1304 [in particle decay];
    Jafarizadeh et al JSM(15)-a1407,
    a1407 [quantum networks];
    Narayanan et al PRD(19)-a1803 [2D disordered system];
    Castellani a2009 [entangled quantum histories];
    > s.a. superfluidity.
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