A1 Refereed original research article in a scientific journal

Quantum-memory-enhanced dissipative entanglement creation in nonequilibrium steady states




AuthorsHeineken Daniel, Beyer Konstantin, Luoma Kimmo, Strunz Walter T.

PublisherAmerican Physical Society

Publication year2021

JournalPhysical Review A

Journal name in sourcePhysical Review A

Article number052426

Volume104

Issue5

eISSN2469-9934

DOIhttps://doi.org/10.1103/PhysRevA.104.052426

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/68463122


Abstract

This article investigates dissipative preparation of entangled nonequilibrium steady states (NESS). We construct a collision model where the open system consists of two qubits which are coupled to heat reservoirs with different temperatures. The baths are modeled by sequences of qubits interacting with the open system. The model can be studied in different dynamical regimes: with and without environmental memory effects. We report that only a certain bath temperature range allows for entangled NESS. Furthermore, we obtain minimal and maximal critical values for the heat current through the system. Surprisingly, quantum memory effects play a crucial role in the long-time limit. First, memory effects broaden the parameter region where quantum correlated NESS may be dissipatively prepared and, second, they increase the attainable concurrence. Most remarkably, we find a heat current range that does not only allow, but even guarantees that the NESS is entangled. Thus, the heat current can witness entanglement of nonequilibrium steady states.


Downloadable publication

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.





Last updated on 2024-26-11 at 21:55