Measurements, quantum discord, and parity in spin-1 systems

We consider the evaluation of the quantum discord and other related measures of quantum correlations in a system formed by a spin-1 and a complementary spin system. A characterization of general projective measurements in such system in terms of spin averages is thereby introduced, which allows one...

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Detalles Bibliográficos
Autores principales: Rossignoli, Raúl Dante, Matera, Juan Mauricio, Canosa, Norma Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Física
Ciencias Exactas
Quantum discord
Quantum correlations
Spin
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/96150
https://ri.conicet.gov.ar/11336/74656
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-96150
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Ciencias Exactas
Quantum discord
Quantum correlations
Spin
spellingShingle Física
Ciencias Exactas
Quantum discord
Quantum correlations
Spin
Rossignoli, Raúl Dante
Matera, Juan Mauricio
Canosa, Norma Beatriz
Measurements, quantum discord, and parity in spin-1 systems
topic_facet Física
Ciencias Exactas
Quantum discord
Quantum correlations
Spin
description We consider the evaluation of the quantum discord and other related measures of quantum correlations in a system formed by a spin-1 and a complementary spin system. A characterization of general projective measurements in such system in terms of spin averages is thereby introduced, which allows one to easily visualize their deviation from standard spin measurements. It is shown that the measurement optimizing these measures corresponds in general to a nonspin measurement. The important case of states that commute with the total S<sub>z</sub> spin-parity is discussed in detail, and the general stationary measurements for such states (parity preserving measurements) are identified. Numerical and analytical results for the quantum discord, the geometric discord, and the one way information deficit in the relevant case of a mixture of two aligned spin-1 states are also presented.
format Articulo
Articulo
author Rossignoli, Raúl Dante
Matera, Juan Mauricio
Canosa, Norma Beatriz
author_facet Rossignoli, Raúl Dante
Matera, Juan Mauricio
Canosa, Norma Beatriz
author_sort Rossignoli, Raúl Dante
title Measurements, quantum discord, and parity in spin-1 systems
title_short Measurements, quantum discord, and parity in spin-1 systems
title_full Measurements, quantum discord, and parity in spin-1 systems
title_fullStr Measurements, quantum discord, and parity in spin-1 systems
title_full_unstemmed Measurements, quantum discord, and parity in spin-1 systems
title_sort measurements, quantum discord, and parity in spin-1 systems
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/96150
https://ri.conicet.gov.ar/11336/74656
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AT materajuanmauricio measurementsquantumdiscordandparityinspin1systems
AT canosanormabeatriz measurementsquantumdiscordandparityinspin1systems
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