Witnessing the quantum discord of all the unknown states

Details Witnessing the quantum discord of all the unknown states Witnessing the quantum discord of all the unknown states

2011-02-23

arxiv.org/abs/1102.4710v1

Physics

Quantum Physics

3 pages and 1 figure. Comments are welcome

Scientific paper

Like entanglement, quantum discord quantifies the quantum correlations. Unlike entanglement, whose detection is extremely difficult, the quantum discord of an arbitrary bipartite state allows itself to be detected perfectly by a single observable, the quantum discord witness. In particular, we report a single observable whose expectation value provides a necessary and sufficient condition for the vanishing quantum discord of an arbitrary bipartite unknown state with four copies. A quantum circuit is designed to measure the quantum discord witness by using only local qubit-measurements.

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