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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F13%3A33146337%21RIV14-GA0-15310___
rdf:type
n8:Vysledek skos:Concept
rdfs:seeAlso
http://pra.aps.org/pdf/PRA/v88/i5/e052104
dcterms: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 direct experimental 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. 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 direct experimental 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.
dcterms:title
Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states
skos:prefLabel
Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states
skos:notation
RIV/61989592:15310/13:33146337!RIV14-GA0-15310___
n8:predkladatel
n20:orjk%3A15310
n3:aktivita
n17:P
n3:aktivity
P(ED2.1.00/03.0058), P(EE2.3.20.0017), P(EE2.3.20.0058), P(EE2.3.30.0041), P(GP13-31000P)
n3:cisloPeriodika
5
n3:dodaniDat
n6:2014
n3:domaciTvurceVysledku
Bartkiewicz, Karol n14:2344076
n3:druhVysledku
n16:J
n3:duvernostUdaju
n21:S
n3:entitaPredkladatele
n4:predkladatel
n3:idSjednocenehoVysledku
69793
n3:idVysledku
RIV/61989592:15310/13:33146337
n3:jazykVysledku
n11:eng
n3:klicovaSlova
photonic two-qubit, quantum communication, quantum information, superfidelity, subfidelity
n3:klicoveSlovo
n12:quantum%20information n12:superfidelity n12:quantum%20communication n12:photonic%20two-qubit n12:subfidelity
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[95A4F6379B6A]
n3:nazevZdroje
Physical Review A
n3:obor
n10:BH
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
3
n3:projekt
n5:EE2.3.30.0041 n5:EE2.3.20.0058 n5:ED2.1.00%2F03.0058 n5:GP13-31000P n5:EE2.3.20.0017
n3:rokUplatneniVysledku
n6:2013
n3:svazekPeriodika
88
n3:tvurceVysledku
Lemr, Karel Miranowicz, Adam Bartkiewicz, Karol
n3:wos
000326815800001
s:issn
1050-2947
s:numberOfPages
8
n13:doi
10.1103/PhysRevA.88.052104
n18:organizacniJednotka
15310