Quantum discord and geometry for a class of two-qubit states

Details Quantum discord and geometry for a class of two-qubit states Quantum discord and geometry for a class of two-qubit states

2011-04-11

arxiv.org/abs/1104.1843v1

Physical Review A 83, 022321(2011)

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevA.83.022321

We study the level surfaces of quantum discord for a class of two-qubit states with parallel nonzero Bloch vectors. The dynamic behavior of quantum discord under decoherence is investigated. It is shown that a class of X states has sudden transition between classical and quantum correlations under decoherence. Our results include the ones in M. D. Lang and C. M. Caves [Phys. Rev. Lett. 105, 150501 (2010)] as a special case and show new pictures and structures of quantum discord.

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