About: Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states

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About: Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://pra.aps.org/pdf/PRA/v88/i5/e052104
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. (en)
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 (en)
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 (en)
skos:notation	RIV/61989592:15310/13:33146337!RIV14-GA0-15310___
http://linked.open...avai/predkladatel	Přírodovědecká fakulta
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/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)
http://linked.open...iv/cisloPeriodika	5
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Lemr, Karel Bartkiewicz, Karol
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	Univerzita Palackého v Olomouci / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	69793
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/13:33146337
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	photonic two-qubit, quantum communication, quantum information, superfidelity, subfidelity (en)
http://linked.open.../riv/klicoveSlovo	quantum information photonic two-qubit quantum communication subfidelity superfidelity
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[95A4F6379B6A]
http://linked.open...i/riv/nazevZdroje	Physical Review A
http://linked.open...in/vavai/riv/obor	BH
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Podpora vytváření excelentních výzkumných týmů a intersektorální mobility na Univerzitě Palackého v Olomouci II. Regional Centre of Advanced Technologies and Materials Research team development of the Regional Centre of Advanced Technologies and Materials Lineárně-optické kvantové hradlo pro podmíněnou změnu fáze a jeho využití Integration of Regional Centre of Advanced Technologies and Materials into International Networks of Nanotechnological and Optical Research.
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	88
http://linked.open...iv/tvurceVysledku	Lemr, Karel Bartkiewicz, Karol Miranowicz, Adam
http://linked.open...ain/vavai/riv/wos	000326815800001
issn	1050-2947
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevA.88.052104
http://localhost/t...ganizacniJednotka	15310

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