Entanglement sensitivity to signal attenuation and amplification

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14330%2F14%3A00073889" target="_blank" >RIV/00216224:14330/14:00073889 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevA.90.010301" target="_blank" >http://dx.doi.org/10.1103/PhysRevA.90.010301</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.90.010301" target="_blank" >10.1103/PhysRevA.90.010301</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Entanglement sensitivity to signal attenuation and amplification

Popis výsledku v původním jazyce

We analyze general laws of continuous-variable entanglement dynamics during the deterministic attenuation and amplification of the physical signal carrying the entanglement. These processes are inevitably accompanied by noises, so we find fundamental limitations on noise intensities that destroy entanglement of Gaussian and non-Gaussian input states. The phase-insensitive amplification Phi1(x)Phi2(x)...(x)PhiN with the power gain ki&gt;2 (approx 3 dB, i=1,...,N) is shown to destroy entanglement of any N-mode Gaussian state even in the case of quantum-limited performance. In contrast, we demonstrate non-Gaussian states with the energy of a few photons such that their entanglement survives within a wide range of noises beyond quantum-limited performancefor any degree of attenuation or gain. We detect entanglement preservation properties of the channel Phi1(x)Phi2, where each mode is deterministically attenuated or amplified.

Název v anglickém jazyce

Entanglement sensitivity to signal attenuation and amplification

Popis výsledku anglicky

We analyze general laws of continuous-variable entanglement dynamics during the deterministic attenuation and amplification of the physical signal carrying the entanglement. These processes are inevitably accompanied by noises, so we find fundamental limitations on noise intensities that destroy entanglement of Gaussian and non-Gaussian input states. The phase-insensitive amplification Phi1(x)Phi2(x)...(x)PhiN with the power gain ki&gt;2 (approx 3 dB, i=1,...,N) is shown to destroy entanglement of any N-mode Gaussian state even in the case of quantum-limited performance. In contrast, we demonstrate non-Gaussian states with the energy of a few photons such that their entanglement survives within a wide range of noises beyond quantum-limited performancefor any degree of attenuation or gain. We detect entanglement preservation properties of the channel Phi1(x)Phi2, where each mode is deterministically attenuated or amplified.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BE - Teoretická fyzika

OECD FORD obor

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Projekt

<a href="/cs/project/GAP202%2F12%2F1142" target="_blank" >GAP202/12/1142: Slabé zdroje entanglementu a náhodnosti</a><br>

Návaznosti

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

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Physical Review A

ISSN

1050-2947

e-ISSN

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Svazek periodika

90

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

1-5

Kód UT WoS článku

000338649000001

EID výsledku v databázi Scopus

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