Analysis of continuous-variable quantum teleportation enhanced by measurement-based noiseless quantum amplification

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F24%3A73621945" target="_blank" >RIV/61989592:15310/24:73621945 - isvavai.cz</a>

Výsledek na webu

<a href="https://opg.optica.org/oe/fulltext.cfm?uri=oe-32-2-2527&id=545493" target="_blank" >https://opg.optica.org/oe/fulltext.cfm?uri=oe-32-2-2527&id=545493</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1364/OE.506757" target="_blank" >10.1364/OE.506757</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Analysis of continuous-variable quantum teleportation enhanced by measurement-based noiseless quantum amplification

Popis výsledku v původním jazyce

Continuous-variable quantum teleportation enables deterministic teleportation of quantum states of optical modes. However, the state transfer is imperfect and limited by the amount of squeezing in the shared two-mode entangled state. Recently, it has been proposed and experimentally demonstrated that the performance of continuous-variable teleportation can be conditionally improved using a measurement-based noiseless quantum amplification [J. Zhao et al., Nat. Commun. 14, 4745 (2023) [CrossRef] ]. An inverse Gaussian filter with sufficiently high cut-off is applied to outcomes of the continuous-variable Bell measurement, which can increase the fidelity of state teleportation and the cost of making the protocol probabilistic. Here we provide a detailed theoretical analysis of this protocol and discuss its effects and limitations. We focus on teleportation of classes of Gaussian states with fixed covariance matrix and variable displacement. The measurement-based noiseless amplification conditionally improves the precision of estimation of the coherent displacement of the teleported state from the outcomes of continuous-variable Bell measurement. Therefore, more information about the teleported state is revealed and unity-gain teleportation becomes possible with a lower added thermal noise as compared to deterministic teleportation.

Název v anglickém jazyce

Analysis of continuous-variable quantum teleportation enhanced by measurement-based noiseless quantum amplification

Popis výsledku anglicky

Continuous-variable quantum teleportation enables deterministic teleportation of quantum states of optical modes. However, the state transfer is imperfect and limited by the amount of squeezing in the shared two-mode entangled state. Recently, it has been proposed and experimentally demonstrated that the performance of continuous-variable teleportation can be conditionally improved using a measurement-based noiseless quantum amplification [J. Zhao et al., Nat. Commun. 14, 4745 (2023) [CrossRef] ]. An inverse Gaussian filter with sufficiently high cut-off is applied to outcomes of the continuous-variable Bell measurement, which can increase the fidelity of state teleportation and the cost of making the protocol probabilistic. Here we provide a detailed theoretical analysis of this protocol and discuss its effects and limitations. We focus on teleportation of classes of Gaussian states with fixed covariance matrix and variable displacement. The measurement-based noiseless amplification conditionally improves the precision of estimation of the coherent displacement of the teleported state from the outcomes of continuous-variable Bell measurement. Therefore, more information about the teleported state is revealed and unity-gain teleportation becomes possible with a lower added thermal noise as compared to deterministic teleportation.

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/GA21-23120S" target="_blank" >GA21-23120S: Kvantové filtry pro přípravu optických kvantových stavů a operací</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

OPTICS EXPRESS

ISSN

1094-4087

e-ISSN

—

Svazek periodika

32

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

2527-2538

Kód UT WoS článku

001174875400006

EID výsledku v databázi Scopus

2-s2.0-85182524240