Enhanced steady-state coherence via repeated system-bath interactions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F21%3A73609522" target="_blank" >RIV/61989592:15310/21:73609522 - isvavai.cz</a>

Result on the web

<a href="https://journals.aps.org/pra/pdf/10.1103/PhysRevA.104.062209" target="_blank" >https://journals.aps.org/pra/pdf/10.1103/PhysRevA.104.062209</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.104.062209" target="_blank" >10.1103/PhysRevA.104.062209</a>

Result language

angličtina

Original language name

Enhanced steady-state coherence via repeated system-bath interactions

Original language description

The appearance of steady-state coherence (SSC) from system-bath interactions proves that quantum effects can appear without an external drive. Such SSC could become a resource to demonstrate a quantum advantage in the applications. We predict the generation of SSC if the target system repeatedly interacts with independent and noncorrelated bath elements. To describe their behavior, we use the collision model approach of systembath interactions, where the system interacts with one bath element (initially in an incoherent state) at a time, asymptotically (in the fast-collision regime) mimicking a macroscopic Markovian bath coupled to the target system. Therefore, the SSC qualitatively appears to be the same as if the continuous Markovian bath were used. We confirm that the presence of composite system-bath interactions under the rotating-wave approximation is the necessary condition for the generation of SSC using thermal resources in collision models. Remarkably, we show that SSC substantially increases if the target system interacts collectively with more than one bath element at a time. A few bath elements collectively interacting with the target system is sufficient to increase SSC at nonzero temperatures at the cost of a tolerable lowering of the final state purity. From the thermodynamic perspective, the SSC generation in our collision models is inevitably linked to a nonzero power input (and thus heat dissipated to the bath) necessary to reach the steady state, although such energetic cost can be lower compared to cases relying on SSC nongenerating interactions.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

PHYSICAL REVIEW A

ISSN

2469-9926

e-ISSN

—

Volume of the periodical

104

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

17

Pages from-to

"062209-1"-"062209-17"

UT code for WoS article

000735423000001

EID of the result in the Scopus database

2-s2.0-85122195172