|  Examples of Entangled Systems and States | 
Types of States
  > s.a. composite systems; entanglement [including status].
  @ Types of entanglement: Krenn & Zeilinger PRA(96) [non-objective];
    Popp et al PRA(05)qp/04 [localizable];
    Buniy & Kephart JPA(12)-a1012,
    JPA(12) [algebraic classification].
  @ For superpositions: Gour PRA(07)-a0707 [tight lower and upper bounds].
  @ For mixed states: Giannetto in(95) [entanglement requires a density matrix];
    Mintert & Buchleitner PRL(07);
    Bhardwaj & Ravishankar qp/07;
    Qi & Hou a1010 [from density-matrix entries];
    Eltschka & Siewert PRL(12)-a1304 [3-qubit states];
    Hsiang & Hu JHEP(15)-a1503 [at high temperatures].
  @ And coherent states: Wang & Sanders PRA(02)qp/01 [multipartite];
    Clausen et al PRA(02)qp;
    Barnum et al PRA(03)qp/02;
    > s.a. coherent states.
  @ Gaussian states: 
    Adesso PRL(06)qp [N-mode, pure];
    Anders qp/06-dipl [bipartite];
    Adesso PhD-qp/07;
    Adesso & Illuminati PRA(08)-a0805;
    Buono et al JOSA(10)-a1006 [bipartite];
    Chaitanya et al a1501 [multi-mode Gaussian states];
    Fukuda & König JMP(19)-a1903.
  @ Gaussian states, entanglement of formation:
    Ivan & Simon a0808;
    Marian & Marian PRL(08)-a0809;
    Nicacio & de Oliveira PRA(14)-a1310.
  @ Other types of states: Stenholm FP(09) [pure states];
    Namiki JPSJ(10)-a0906 [non-Gaussian];
    Hajdusek & Vedral NJP(10)-a0911 [cluster states].
Simple Systems
  > s.a. brownian motion; cellular
  automaton; lattice theories; networks;
  phenomenology of entanglement [dynamics, effects, observation].
  @ Qubits: Wootters PRL(98)qp/97 [2];
    van Enk PRA(05)qp [|0\(\rangle\)|1\(\rangle\) + |1\(\rangle\)|0\(\rangle\)];
    Avron & Kenneth AP(09) [2];
    Cui et al JPA(09) [2 coupled, in a common environment];
    Gour & Wallach JMP(10)-a1006 [4];
    Aulbach et al LNCC(10)-a1010,
    Aulbach a1103-conf [n, symmetric entanglement classes];
    El-Orany a1106,
    a1204 [2, spin-correlation matrix];
    de Vicente et al PRL(12)-a1106 [3, operational measures];
    Tian et al AP(13)-a1301 [2 and 3, one accelerated];
    Borsten JPCS(14)-a1311 [3, using Jordan algebras];
    Holweck et al JMP(14) [4];
    Banerjee et al a1504
      [n, maximal entanglement concentration];
    Rangamani & Rota JPA(15)-a1505 [detailed analysis of entanglement structures];
    Datta et al EPJD(18)-a1705 [3, pure states];
    Samuel et al AP(18)-a1801 [2];
    Chen & Jiang a1901 [hierarchy of entanglement criteria];
    Yang et al CTP(19)-a1906 [monogamy and polygamy inequalities of multiqubit entanglement];
    > s.a. phenomenology; quantum computing.
  @ Chains, graph states: Wootters CM(02)qp/00;
    Hein et al PRA(04);
    Han & Duan a0708-wd;
    Van den Nest et al PRA(08);
    Cabello et al PRA(09)-a0904 [invariants for 8 qubits];
    Collins et al JPA(10)-a1003 [random graph states];
    Ivanchenko a1106 [qutrit chain in a magnetic field];
    Wu et al PRA(14)-a1403 [randomized graph states];
    > s.a. Quantiki page.
  @ Single-particle systems: Can et al qp/04/JOB;
    Terra Cunha et al PRS(07)qp/06 [atom];
    Dasenbrook et al NJP(16)-a1511 [electron];
    > s.a. neutrino oscillations.
  @ Two-particle systems: Curilef et al EJP(06) [in a double well, speed of evolution];
    Castro-Ruiz & Nahmad-Achar PRA(12)-a1210 [spin-1, and Lorentz transformations];
    Man'ko & Markovich JRLR(15)-a1406 [spin-1/2];
    Mihaescu & Isar RJP-a1512 [two bosonic modes in a thermal environment];
    Karczewski & Kurzyński PRA(16)-a1608 [distinguishable];
    Kuś et al a1811 [large angular momenta].
  @ Atoms: Tommasini et al AJP(98)oct-qp/97,
    Zhu et al PhyA(05) [\(e\)-\(p\) in H];
    Turchette et al PRL(98)
    + pn(98)nov;
    Sackett et al Nat(00)mar [ions];
    Lombardi & Matzkin PRA(06)qp [molecules];
    Moehring et al Nat(07)sep
    + pw(07)sep [1 m apart];
    Vacanti & Beige NJP(09)-a0903 [preparation];
    Jost et al Nat(09)jun-a0901
    + news BBC(09)jun [motions of pairs of atoms];
    Sancho & Plaja JPB(09) [unstable atoms, modified emission properties];
    Rossatto & Villas-Boas PRA(13)-a1307 [two atoms in a cavity];
    news sn(17)mr [millions of atoms].
  @ Atom + photon: Inoue et al PRA(06)qp;
    de Riedmatten et al PRL(06)qp;
    Rosenfeld et al PRL(08).
  @ 3-way: Schlienz & Mahler PLA(96)
      [three 2-level systems, maximally entangled];
    Coffman et al PRA(00)qp/99 [distributed];
    Carteret et al FP(99);
    Fivel FP(99); & GHZ,
    Seevinck & Uffink PRA(02) [3 particles];
    Eisert & Gross qp/05-ch;
    Low et al qp/06
      [collisional decoherence and rarity of entanglement];
    Yu & Song PRA(06)qp [tripartite, criterion];
    Boixo & Monras PRL(08)-a0706 [operational interpretation];
    Sabín & García-Alcaine EPJD(08)-a0707 [3 qubits];
    Facchi et al PRA(09)-a0908 [maximally entangled];
    Park & Lee IJTP(12)-a1012 [separable states and  entanglement distribution];
    Buscemi & Bordone PRA(11) [tripartite, for bosons or fermions].
  @ Multipartite: Iwai JPA(07) [multi-qubit];
    Huber et al PRL(10);
    Band & Osherov a1010;
    Grabowski et al JPA(11)-a1012 [in terms of representation theory of symmetry groups];
    Schwemmer et al PRL(15)-a1410 [without multipartite correlations];
    Miklin et al PRA(16)-a1506 [as an emergent phenomenon];
    Patrascu JHEP(17)-a1707 [and topology];
    Bryan et al Quant(19)-a1801 [locally maximally entangled states].
  @ Spin systems: Schliemann PRA(03) [SU(2)-invariant];
    Calsamiglia et al qp/05 [spin gas];
    Novaes AP(05) [two interacting spins in constant B];
    Campos Venuti et al PRL(06)qp [long-range];
    Tribedi & Bose PRA(06)qp [spin clusters];
    Verhulst & Naudts JPA(07) [microcanonical ensemble];
    Saguia et al PRA(07)qp [random spin chains];
    Botero & Reznik a0708 [scaling and universality at criticality];
    Latorre & Riera JPA(09)-a0906 [rev];
    Dudin et al PRL(09) [photon + optical-lattice spin wave];
    Ng & Bose JPA(10) [stability];
    Galve et al EPJST(10)-a1004 [far from equilibrium];
    Zheng et al PRA(10)-a1005 [between blocks of spins];
    Zenchuk a1005 [homogeneous spin-1/2 chains];
    Simmons et al Nat(11)feb-a1010 [solid-state spin ensemble];
    Esfahani JPA(10)-a1010 [spin-1/2 particles in a gravitational field];
    Cattaruzza et al PLA(14)-a1308 [supersymmetric quantum mechanics];
    Torlai et al JSM(14)-a1311 [dynamics of the entanglement spectrum];
    Cui & Mintert NJP(15)-a1407 [disordered spin chains];
    Pappalardi et al PRB(18)-a1806 [long-range spin chains];
    > s.a. ising model; spin models [Heisenberg models].
  @ Other simple systems: Sassoli de Bianchi AP(13)-a1301 [two dice];
    > s.a. particle statistics [identical particles];
      quantum systems.
Other Systems > s.a. entanglement in quantum field theory
  [including cosmology, spacetime]; topology and physics [non-trivial topologies].
  * Photons: A standard way to
    obtain entanglement is through double emission of photons by an excited atom;
    > s.a. optics [classical]; photon phenomenology.
  @ Oscillators: Paz & Roncaglia PRL(08)-a0801,
    PRA(09)-a0809,
    Isar PS(11)-a1102,
    Queisser et al a1111 [two in a common environment];
    Miao et al PRA(10) [and continuous field];
    Merdaci & Jellal PLA-a1909 [three coupled harmonic oscillators].
  @ Photons: Poh et al PRL(15)
    + news as(15)nov [close to the Tsirelson bound];
    Hiesmayr et al PRL(16) [4];
    Wang et al PRL(16) [10];
    Rab et al nComm(17)-a1702 [wave-particle entanglement of two photons];
    news cosmos(17)oct [satellites around earth];
    news pt(18)nov [trio of entangled qutrits].
  @ Other bosons:  Paskauskas & You PRA(01)qp [2 bosons];
    Sarkar FP(10)-a0907 [neutral kaons, CPT, and spacetime foam];
    Wang et al JPA(06)qp,
      Dalton et al a1506 [identical bosons];
    Barros et al a1912 [role of particle indistinguishability].
  @ Fermions: Schliemann et al PRB(01);
    Zanardi PRA(02)qp/01;
    Kaplan FNL(05)qp;
    Finster JPA(10)-a0911 [and fermionic projector];
    Grover PRL(13)-a1307 [interacting, in Monte Carlo simulations];
    Ladyman et al SHPMP(13) [and non-factorizability];
    Benatti et al PRA(14)-a1403;
    Valdés-Hernández et al PRA(15)-a1501 [systems of identical fermions undergoing decoherence];
    Sokoli & Kümmerer a1507 [identical particles];
    Gigena & Rossignoli PRA-a1509;
    Benatti & Floreanini JPA(16)-a1605 [in algebraic quantum mechanics];
    Cornfeld et al PRA(19)-a1808 [experimental setups];
    Shi et al a1906 [in accelerated frames].
  @ Open systems: Hartmann et al NJP(07);
    Isar PS(09)-a0812-conf.
  @ Macroscopic systems: Julsgaard et al Nat(01)qp
    + pn(01)sep [gas, long-lived];
    Shimizu & Morimae PRL(05)qp;
    news pw(13)oct [tiny mechanical drum and microwave field];
    Ghobadi et al PRL(14)-a1401
    + news PhysOrg(14)apr,
    Wang et al PRA(15)-a1412 [micro-macro entangled states (and quantum gravity)];
    Schnabel PRA(15)
    + news pw(15)aug [two 100-g mirror proposal];
    Tiranov et al PRL(16)-a1510 [micro-macro entanglement between a photon and many atoms];
    news cosmos(18)apr;
    Marletto et al JPcomm(18)
      [Coles et al Small(17)]
      + news livesci(18)nov [between living bacteria].
  @ Condensed-matter systems: Brukner et al PRA(06)qp/04 [antiferromagnetic spin chains];
    Dowling et al PRA(06)qp;
    Skrøvseth PhD(06)qp;
    Osterloch Hab(07)-a0810;
    Cramer et al PRL(11)-a1009 [and measurement];
    news pw(11)dec [two diamonds 15 cm apart];
    Fogarty et al PRA(13)-a1208 [two defects embedded in a crystalline structure];
    Schuch a1306-ln [rev, esp tensor network states];
    Forgues et al PRL(15) [quantum conductor at low temperatures];
    Laflorencie PRP(16)-a1512 [rev];
    > s.a. entanglement entropy [spin chains].
  @ Many-body systems: Amico et al RMP(08)qp/07;
    Clark et al FP(10);
    Cirac a1205-proc [quantum-information perspective];
    Abanin & Demler PRL(12),
    Daley et al PRL(12) [experiments, measurement];
    Eisert a1308-ln [and tensor network states];
    Bardarson et al PRL(12),
    Nanduri et al PRB(14)-a1404 [entanglement spreading];
    Boette et al PRB(15)-a1410 [mean-field description];
    Cianciaruso et al a1412 [and quantum correlations];
    Ho & Abanin PRB(17)-a1508;
    He et al sRep-a1508 [multiphoton];
    Pichler et al PRX(16) [cold atoms, measurement protocol];
    Alba et al JSM(19)-a1807 [random inhomogeneous systems, area-law violations];
    Bertini et al PRX(19) [chaotic quantum systems].
  @ Systems that never interacted: Guerra & Carvalho JMO(06)qp/05 [atoms];
    Sabín et al PRL(12)-a1202
    + news PhysOrg(12)jul [qubits, past-future entanglement].
  @ Other systems: Nienhuis JPA(01) [decay];
    Braun PRA(05) [heat-bath-induced entanglement];
    Harshman QIC(07)qp/06 [continuous-discrete];
    Adesso & Illuminati JPA(07)qp [continuous-variable systems];
    Bastidas et al PRA(10)-a0910 [driven, and parametric resonance];
    Lee & Vidal PRA(13)-a1306 [topologically ordered systems, entanglement negativity];
    Bellomo & Antezza NJP(13)-a1310 [systems out of thermal equilibrium].
 main page
  – abbreviations
  – journals – comments
  – other sites – acknowledgements
  send feedback and suggestions to bombelli at olemiss.edu – modified 23 jan 2021