Probability-based comparison of quantum states

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14330%2F12%3A00080562" target="_blank" >RIV/00216224:14330/12:00080562 - isvavai.cz</a>

Výsledek na webu

<a href="http://link.aps.org/doi/10.1103/PhysRevA.85.062301" target="_blank" >http://link.aps.org/doi/10.1103/PhysRevA.85.062301</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.85.062301" target="_blank" >10.1103/PhysRevA.85.062301</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Probability-based comparison of quantum states

Popis výsledku v původním jazyce

We address the following state comparison problem: is it possible to design an experiment enabling us to unambiguously decide (based on the observed outcome statistics) on the sameness or difference of two unknown state preparations without revealing complete information about the states? We find that the claim ?the same? can never be concluded without any doubts unless the information is complete. Moreover, we prove that a universal comparison (that perfectly distinguishes all states) also requires complete information about the states. Nevertheless, for some measurements, the probability distribution of outcomes still allows one to make an unambiguous conclusion regarding the difference between the states even in the case of incomplete information. We analyze an efficiency of such a comparison of qudit states when it is based on the swap measurement.

Název v anglickém jazyce

Probability-based comparison of quantum states

Popis výsledku anglicky

We address the following state comparison problem: is it possible to design an experiment enabling us to unambiguously decide (based on the observed outcome statistics) on the sameness or difference of two unknown state preparations without revealing complete information about the states? We find that the claim ?the same? can never be concluded without any doubts unless the information is complete. Moreover, we prove that a universal comparison (that perfectly distinguishes all states) also requires complete information about the states. Nevertheless, for some measurements, the probability distribution of outcomes still allows one to make an unambiguous conclusion regarding the difference between the states even in the case of incomplete information. We analyze an efficiency of such a comparison of qudit states when it is based on the swap measurement.

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)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2012

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

—

Svazek periodika

85

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

062301

Kód UT WoS článku

000304692200002

EID výsledku v databázi Scopus

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