About: Witnessing negativity of Wigner function by estimating fidelities of catlike states from homodyne measurements

Facets (new session)
Description
Metadata
Settings
- owl:sameAs
- Inference Rule:

About: Witnessing negativity of Wigner function by estimating fidelities of catlike states from homodyne measurements Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We derive sampling functions for estimation of quantum-state fidelity with Schrodinger-cat-like states, which are defined as superpositions of two coherent states with opposite amplitudes. We also provide sampling functions for fidelity with squeezed Fock states that can approximate the catlike states and can be generated from Gaussian squeezed states by conditional photon subtraction. The fidelities can be determined by averaging the sampling functions over quadrature statistics measured by homodyne detection. The sampling functions are designed such that they can compensate for losses and inefficient homodyning provided that the overall efficiency exceeds a certain threshold. The fidelity with an odd coherent state and the fidelity with a squeezed odd Fock state provide convenient witnesses of negativity of the Wigner function of the measured state. The negativity of the Wigner function at the origin of phase space is certified if any of these fidelities exceeds 0.5. Finally, we discuss the possibility of reducing the statistical uncertainty of the fidelity estimates by a suitable choice of the dependence of the number of quadrature samples on the relative phase shift between the local oscillator and the signal beam. We derive sampling functions for estimation of quantum-state fidelity with Schrodinger-cat-like states, which are defined as superpositions of two coherent states with opposite amplitudes. We also provide sampling functions for fidelity with squeezed Fock states that can approximate the catlike states and can be generated from Gaussian squeezed states by conditional photon subtraction. The fidelities can be determined by averaging the sampling functions over quadrature statistics measured by homodyne detection. The sampling functions are designed such that they can compensate for losses and inefficient homodyning provided that the overall efficiency exceeds a certain threshold. The fidelity with an odd coherent state and the fidelity with a squeezed odd Fock state provide convenient witnesses of negativity of the Wigner function of the measured state. The negativity of the Wigner function at the origin of phase space is certified if any of these fidelities exceeds 0.5. Finally, we discuss the possibility of reducing the statistical uncertainty of the fidelity estimates by a suitable choice of the dependence of the number of quadrature samples on the relative phase shift between the local oscillator and the signal beam. (en)
Title	Witnessing negativity of Wigner function by estimating fidelities of catlike states from homodyne measurements Witnessing negativity of Wigner function by estimating fidelities of catlike states from homodyne measurements (en)
skos:prefLabel	Witnessing negativity of Wigner function by estimating fidelities of catlike states from homodyne measurements Witnessing negativity of Wigner function by estimating fidelities of catlike states from homodyne measurements (en)
skos:notation	RIV/61989592:15310/13:33144347!RIV14-GA0-15310___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GAP205/12/0577)
http://linked.open...iv/cisloPeriodika	6
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Fiurášek, Jaromír Ježek, Miroslav
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	117428
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/13:33144347
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	phase; information; quadrature distributions; density-matrix (en)
http://linked.open.../riv/klicoveSlovo	phase quadrature distributions information density-matrix
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[FD1D7E7525AD]
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	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Reliable highly nonlinear quantum information processing of light
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	87
http://linked.open...iv/tvurceVysledku	Fiurášek, Jaromír Ježek, Miroslav
http://linked.open...ain/vavai/riv/wos	000320764300005
issn	1050-2947
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevA.87.062115
http://localhost/t...ganizacniJednotka	15310

Faceted Search & Find service v1.16.118 as of Jun 21 2024

Alternative Linked Data Documents: ODE Content Formats:

RDF

ODATA

Microdata

About

OpenLink Virtuoso version 07.20.3240 as of Jun 21 2024, on Linux (x86_64-pc-linux-gnu), Single-Server Edition (126 GB total memory, 48 GB memory in use)
Data on this page belongs to its respective rights holders.
Virtuoso Faceted Browser Copyright © 2009-2024 OpenLink Software