About: Unambiguous coherent state identification: Searching quantum database

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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> and \|alpha_2>, respectively. The third mode is prepared either in the state \|alpha_1> or in the state \|alpha_2>. 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 to perform 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 capable to 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. 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> and \|alpha_2>, respectively. The third mode is prepared either in the state \|alpha_1> or in the state \|alpha_2>. 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 to perform 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 capable to 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. (en)
Title	Unambiguous coherent state identification: Searching quantum database Unambiguous coherent state identification: Searching quantum database (en)
skos:prefLabel	Unambiguous coherent state identification: Searching quantum database Unambiguous coherent state identification: Searching quantum database (en)
skos:notation	RIV/00216224:14330/07:00020701!RIV10-GA0-14330___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA201/07/0603), Z(MSM0021622419)
http://linked.open...iv/cisloPeriodika	No. 2
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Přibyla, Ondřej Ziman, Mário Bužek, Vladimír Hillery, Mark
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Fakulta informatiky
http://linked.open...dnocenehoVysledku	456556
http://linked.open...ai/riv/idVysledku	RIV/00216224:14330/07:00020701
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	quantum information processing; unambiguous state identification; quantum search (en)
http://linked.open.../riv/klicoveSlovo	quantum information processing quantum search unambiguous state identification
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[6AF04AF0CB1D]
http://linked.open...i/riv/nazevZdroje	Physical Review A
http://linked.open...in/vavai/riv/obor	IN
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Quantum multipartite computation, communication and security
http://linked.open...UplatneniVysledku	2007
http://linked.open...v/svazekPeriodika	Vol. 76
http://linked.open...iv/tvurceVysledku	Bužek, Vladimír Sedlák, Michal Ziman, Mário Hillery, Mark Přibyla, Ondřej
http://linked.open...ain/vavai/riv/wos	000249154900046
http://linked.open...n/vavai/riv/zamer	Highly Parallel and Distributed Computing Systems
issn	1050-2947
number of pages	12 (xsd:int)
http://localhost/t...ganizacniJednotka	14330
is http://linked.open...avai/riv/vysledek of	Unambiguous coherent state identification: Searching quantum database Unambiguous coherent state identification: Searching quantum database Unambiguous coherent state identification: Searching quantum database

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