A New Perspective on Quantum Discord Based on Quantum Measurement

Details A New Perspective on Quantum Discord Based on Quantum Measurement A New Perspective on Quantum Discord Based on Quantum Measurement

2011-12-13

arxiv.org/abs/1112.2767v1

Physics

Quantum Physics

4 pages, all comments are welcome

Scientific paper

In this paper we discuss quantum correlation in terms of quantum measurement. Besides providing knowledge on the measured system, quantum measurement always introduces disturbances and decoherence on the measured system, it also results in quantum correlations between the measured system and the measuring system. For bipartite states, these measurement effects are different for the local system and the whole system. Such differences come from the quantum correlation in the bipartite state and can be used to measure it. With proper quantitative measures introduced in [Buscemi, Hayashi and Horodecki, Phys. Rev. Lett. 100, 2210504 (2008)], we show that all the differences of the above measurement effects can be unified to give a new perspective on quantum discord which is a well known quantum correlation measure.

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