Quantum Zeno effect and nonclassicality in a PT-symmetric system of coupled cavities

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73595377" target="_blank" >RIV/61989592:15310/19:73595377 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/pra/pdf/10.1103/PhysRevA.99.023820" target="_blank" >https://journals.aps.org/pra/pdf/10.1103/PhysRevA.99.023820</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.99.023820" target="_blank" >10.1103/PhysRevA.99.023820</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantum Zeno effect and nonclassicality in a PT-symmetric system of coupled cavities

Popis výsledku v původním jazyce

The interplay between the nonclassical features and the parity-time (PT) symmetry (or its breaking) is studied here by considering a PT-symmetric system consisting of two cavities with gain and loss. The conditions for PT invariance are obtained for this system. The behavior of the average photon number corresponding to the gain and loss modes for different initial states (e.g., vacuum, NOON, coherent, and thermal states) has also been obtained. With the help of the number operators, quantum Zeno and anti-Zeno effects are studied, and the observed behavior is compared in PT-symmetric (PTS) and PT-symmetry-broken (PTSB) regimes. It has been observed that the relative phase of the input coherent fields plays a key role in the occurrence of these effects. Further, some nonclassicality features are witnessed using criteria based on the number operator(s). Specifically, intermodal antibunching, sum, and difference squeezing are investigated for specific input states. It is found that the various nonclassical features, including the observed quantum Zeno and anti-Zeno effects, are suppressed when one goes from the PTS to PTSB regime. In other words, the dominance of the loss or gain rate in the field modes over the coupling strength between them diminishes the nonclassical features of the system.

Název v anglickém jazyce

Quantum Zeno effect and nonclassicality in a PT-symmetric system of coupled cavities

Popis výsledku anglicky

The interplay between the nonclassical features and the parity-time (PT) symmetry (or its breaking) is studied here by considering a PT-symmetric system consisting of two cavities with gain and loss. The conditions for PT invariance are obtained for this system. The behavior of the average photon number corresponding to the gain and loss modes for different initial states (e.g., vacuum, NOON, coherent, and thermal states) has also been obtained. With the help of the number operators, quantum Zeno and anti-Zeno effects are studied, and the observed behavior is compared in PT-symmetric (PTS) and PT-symmetry-broken (PTSB) regimes. It has been observed that the relative phase of the input coherent fields plays a key role in the occurrence of these effects. Further, some nonclassicality features are witnessed using criteria based on the number operator(s). Specifically, intermodal antibunching, sum, and difference squeezing are investigated for specific input states. It is found that the various nonclassical features, including the observed quantum Zeno and anti-Zeno effects, are suppressed when one goes from the PTS to PTSB regime. In other words, the dominance of the loss or gain rate in the field modes over the coupling strength between them diminishes the nonclassical features of the system.

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

<a href="/cs/project/LO1305" target="_blank" >LO1305: Rozvoj centra pokročilých technologií a materiálů</a><br>

Návaznosti

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

Rok uplatnění

2019

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

99

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

"023820-1"-"023820-9"

Kód UT WoS článku

000458361300016

EID výsledku v databázi Scopus

2-s2.0-85061532103