Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F13%3A33146337" target="_blank" >RIV/61989592:15310/13:33146337 - isvavai.cz</a>
Result on the web
<a href="http://pra.aps.org/pdf/PRA/v88/i5/e052104" target="_blank" >http://pra.aps.org/pdf/PRA/v88/i5/e052104</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.88.052104" target="_blank" >10.1103/PhysRevA.88.052104</a>
Alternative languages
Result language
angličtina
Original language name
Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states
Original language description
The Uhlmann-Jozsa fidelity (or, equivalently, the Bures distance) is a basic concept of quantum communication and quantum information, which however is very difficult to measure efficiently without recourse to quantum tomography. Here we propose a directexperimental method to estimate the fidelity between two unknown two-qubit mixed states via the measurement of the upper and lower bounds of the fidelity, which are referred to as the superfidelity and subfidelity, respectively. Our method enables a direct measurement of the first- and second-order overlaps between two arbitrary two-qubit states. In particular, the method can be applied to measure the purity (or linear entropy) of a single two-qubit mixed state in a direct experiment. We also propose and critically compare several experimental strategies for measuring the sub- and superfidelities of polarization states of photons in various linear-optical setups.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BH - Optics, masers and lasers
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review A
ISSN
1050-2947
e-ISSN
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Volume of the periodical
88
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
"052104-1"-"052104-8"
UT code for WoS article
000326815800001
EID of the result in the Scopus database
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