IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Generalized measures of quantum correlations for mixed states
Autor/es:
R. ROSSIGNOLI; N. CANOSA; L. CILIBERTI
Lugar:
Paraty
Reunión:
Workshop; III Quantum Information School and workshop - Paraty 2011; 2011
Institución organizadora:
CNPq
Resumen:
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 for mixed states. In this contribution we discuss a general measure of non-classical correlations for bipartite systems based on generalized entropic functions, defined as the minimum information loss due to a local measurement. In the case of pure states it reduces to the generalized entanglement entropy, i.e., to the generalized entropy of the reduced state. However, in the case of mixed states it can be nonzero in separable states, vanishing just for states diagonal in a general product basis, like the quantum discord. Simple quadratic measures of quantum correlations arise as a particular case of the present formalism. The minimum information loss due to a joint local measurement is also considered. The evaluation of these measures in some relevant cases will also be discussed, together with comparison with the corresponding entanglement monotones.
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