caa a22 4500 445858850 CHVBK 20180317145436.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10946-011-9236-9 doi (NATIONALLICENCE)springer-10.1007/s10946-011-9236-9 Generalized measures of quantum correlations for mixed states [Elektronische Daten] [R. Rossignoli, N. Canosa, L. Ciliberti] 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. Springer Science+Business Media, Inc., 2011 quantum correlations nationallicence quantum entanglement nationallicence generalized entropic forms nationallicence Rossignoli R. Departamento de Física - IFLP, Universidad Nacional de La Plata, C.C.67, CP:1900, Buenos Aires, La Plata, Argentina aut Canosa N. Departamento de Física - IFLP, Universidad Nacional de La Plata, C.C.67, CP:1900, Buenos Aires, La Plata, Argentina aut Ciliberti L. Departamento de Física - IFLP, Universidad Nacional de La Plata, C.C.67, CP:1900, Buenos Aires, La Plata, Argentina aut Journal of Russian Laser Research Springer US; http://www.springer-ny.com 32/5(2011-09-01), 467-475 1071-2836 32:5<467 2011 32 10946 https://doi.org/10.1007/s10946-011-9236-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10946-011-9236-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rossignoli R. Departamento de Física - IFLP, Universidad Nacional de La Plata, C.C.67, CP:1900, Buenos Aires, La Plata, Argentina aut NATIONALLICENCE 700 1- Canosa N. Departamento de Física - IFLP, Universidad Nacional de La Plata, C.C.67, CP:1900, Buenos Aires, La Plata, Argentina aut NATIONALLICENCE 700 1- Ciliberti L. Departamento de Física - IFLP, Universidad Nacional de La Plata, C.C.67, CP:1900, Buenos Aires, La Plata, Argentina aut NATIONALLICENCE 773 0- Journal of Russian Laser Research Springer US; http://www.springer-ny.com 32/5(2011-09-01), 467-475 1071-2836 32:5<467 2011 32 10946 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer