Enhanced steady-state coherence via repeated system-bath interactions

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhanced steady-state coherence via repeated system-bath interactions

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Enhanced steady-state coherence via repeated system-bath interactions

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

PHYSICAL REVIEW A

ISSN

2469-9926

e-ISSN

—

Svazek periodika

104

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

"062209-1"-"062209-17"

Kód UT WoS článku

000735423000001

EID výsledku v databázi Scopus

2-s2.0-85122195172