Generalized measures of quantum correlations for mixed states

The exponential speedup achieved in certain quantum algorithms based on mixed states with negligible entanglement has renewed the interest on alternative measures of quantum correlations. Here we discuss a general measure of quantum correlations for composite systems based on generalized entropic fu...

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Detalles Bibliográficos
Autores principales:	Rossignoli, Raúl Dante, Canosa, Norma Beatriz, Ciliberti, Leonardo Francisco
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2011
Materias:	Ciencias Exactas Física quantum correlations quantum entanglement generalized entropic forms
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/142122
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-142122
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Exactas Física quantum correlations quantum entanglement generalized entropic forms
spellingShingle	Ciencias Exactas Física quantum correlations quantum entanglement generalized entropic forms Rossignoli, Raúl Dante Canosa, Norma Beatriz Ciliberti, Leonardo Francisco Generalized measures of quantum correlations for mixed states
topic_facet	Ciencias Exactas Física quantum correlations quantum entanglement generalized entropic forms
description	The exponential speedup achieved in certain quantum algorithms based on mixed states with negligible entanglement has renewed the interest on alternative measures of quantum correlations. Here we discuss a general measure of quantum correlations for composite systems based on generalized entropic functions, defined as the minimum information loss due to a local measurement. For pure states, the present measure becomes an entanglement entropy, i.e., it reduces to the generalized entropy of the reduced state. However, for mixed states it can be nonzero in separable states, vanishing just for states diagonal in a general product basis, like the quantum discord. Quadratic measures of quantum correlations can be derived as particular cases of the present formalism. The minimum information loss due to a joint local measurement is also considered. The evaluation of these measures in a simple yet relevant case is also discussed.
format	Articulo Articulo
author	Rossignoli, Raúl Dante Canosa, Norma Beatriz Ciliberti, Leonardo Francisco
author_facet	Rossignoli, Raúl Dante Canosa, Norma Beatriz Ciliberti, Leonardo Francisco
author_sort	Rossignoli, Raúl Dante
title	Generalized measures of quantum correlations for mixed states
title_short	Generalized measures of quantum correlations for mixed states
title_full	Generalized measures of quantum correlations for mixed states
title_fullStr	Generalized measures of quantum correlations for mixed states
title_full_unstemmed	Generalized measures of quantum correlations for mixed states
title_sort	generalized measures of quantum correlations for mixed states
publishDate	2011
url	http://sedici.unlp.edu.ar/handle/10915/142122
work_keys_str_mv	AT rossignolirauldante generalizedmeasuresofquantumcorrelationsformixedstates AT canosanormabeatriz generalizedmeasuresofquantumcorrelationsformixedstates AT cilibertileonardofrancisco generalizedmeasuresofquantumcorrelationsformixedstates
bdutipo_str	Repositorios
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Generalized measures of quantum correlations for mixed states

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