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Entanglement and diagonal entropies after a quench with no pair structure
ID Bertini, Bruno (Avtor), ID Tartaglia, Elena (Avtor), ID Calabrese, Pasquale (Avtor)

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Izvleček
A typical working condition in the study of quantum quenches is that the initial state produces a distribution of quasiparticle excitations with an opposite-momentum-pair structure. In this work we investigate the dynamical and stationary properties of the entanglement entropy after a quench from initial states which do not have such structure: instead of pairs of excitations they generate $\nu$-plets of correlated excitations with $\nu$ > 2. Our study is carried out focusing on a system of non-interacting fermions on the lattice. We study the time evolution of the entanglement entropy showing that the standard semiclassical formula is not applicable. We propose a suitable generalisation which correctly describes the entanglement entropy evolution and perfectly matches numerical data. We finally consider the relation between the thermodynamic entropy of the stationary state and the diagonal entropy, showing that when there is no pair structure their ratio depends on the details of the initial state and lies generically between 1/2 and 1.

Jezik:Angleški jezik
Ključne besede:quantum statistical mechanics, integrable systems, quantum entanglement
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FMF - Fakulteta za matematiko in fiziko
Različica publikacije:Recenzirani rokopis
Leto izida:2018
Št. strani:31 str.
Številčenje:Vol. 2018, art. no. 063104
PID:20.500.12556/RUL-105237 Povezava se odpre v novem oknu
UDK:536.93
ISSN pri članku:1742-5468
DOI:10.1088/1742-5468/aac73f Povezava se odpre v novem oknu
COBISS.SI-ID:3264868 Povezava se odpre v novem oknu
Datum objave v RUL:13.11.2018
Število ogledov:1316
Število prenosov:541
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Gradivo je del revije

Naslov:Journal of statistical mechanics
Skrajšan naslov:J. stat. mech.
Založnik:IOP Publishing
ISSN:1742-5468
COBISS.SI-ID:21517607 Povezava se odpre v novem oknu

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:kvantna statistična mehanika, integrabilni sistemi, kvantna prepletenost

Projekti

Financer:EC - European Commission
Program financ.:H2020
Številka projekta:694544
Naslov:Open many-body non-equilibrium systems
Akronim:OMNES

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