Jednoznačná identifikace koherentních stavů: Prohledávání kvantové databáze

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14330%2F07%3A00020701" target="_blank" >RIV/00216224:14330/07:00020701 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Unambiguous coherent state identification: Searching quantum database

Popis výsledku v původním jazyce

We consider an unambiguous identification of an unknown coherent state with one of two unknown coherent reference states. Specifically, we consider two modes of an electromagnetic field prepared in unknown coherent states |alpha_1&gt; and |alpha_2&gt;, respectively. The third mode is prepared either in the state |alpha_1&gt; or in the state |alpha_2&gt;. The task is to identify (unambiguously) which of the two modes are in the same state. We present a scheme consisting of three beamsplitters capable toperform this task. Although we do not prove the optimality, we show that the performance of the proposed setup is better than the generalization of the optimal measurement known for a finite-dimensional case. We show that a single beamsplitter is capableto perform an unambiguous quantum state comparison for coherent states optimally. Finally we propose an experimental setup consisting of 2N-1 beamsplitters for unambiguous identification among N unknown coherent states. This setup can be

Název v anglickém jazyce

Unambiguous coherent state identification: Searching quantum database

Popis výsledku anglicky

We consider an unambiguous identification of an unknown coherent state with one of two unknown coherent reference states. Specifically, we consider two modes of an electromagnetic field prepared in unknown coherent states |alpha_1&gt; and |alpha_2&gt;, respectively. The third mode is prepared either in the state |alpha_1&gt; or in the state |alpha_2&gt;. The task is to identify (unambiguously) which of the two modes are in the same state. We present a scheme consisting of three beamsplitters capable toperform this task. Although we do not prove the optimality, we show that the performance of the proposed setup is better than the generalization of the optimal measurement known for a finite-dimensional case. We show that a single beamsplitter is capableto perform an unambiguous quantum state comparison for coherent states optimally. Finally we propose an experimental setup consisting of 2N-1 beamsplitters for unambiguous identification among N unknown coherent states. This setup can be

Druh

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

CEP obor

IN - Informatika

OECD FORD obor

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Projekt

<a href="/cs/project/GA201%2F07%2F0603" target="_blank" >GA201/07/0603: Výpočty, komunikace a bezpečnost kvantových distribuovaných systémů</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2007

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

Vol. 76

Číslo periodika v rámci svazku

No. 2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

"A022326"

Kód UT WoS článku

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EID výsledku v databázi Scopus

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