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Correlations in quantum states and the local creation of quantum discord | | Manuel Gessner
; Elsi-Mari Laine
; Heinz-Peter Breuer
; Jyrki Piilo
; | | Date: |
9 Feb 2012 | | Abstract: | Quantum discord is usually referred to as a measure for quantum correlations.
In the search of the fundamental resource to gain a quantum advantage in
quantum information applications, quantum discord is considered a promising
candidate. In this paper we present an alternative view on quantum correlations
in terms of the rank of the correlation matrix as introduced in [Phys. Rev.
Lett. 105, 190502 (2010)]. According to our analysis, information about the
quantum discord does not necessarily determine the amount of quantum
correlations but rather the quantumness of the state. Nonzero quantum discord
is only a necessary but not a sufficient condition for correlations above the
classically achievable limit. This becomes clear when we consider states of
nonzero discord which can be created from zero discord states only by a single
local operation. We further show that the set of these states has measure zero. | | Source: | arXiv, 1202.1959 | | Services: | Forum | Review | PDF | Favorites | |
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