Wednesday, July 3, 2013

1307.0338 (Chao-Qian Pang et al.)

Sequential State Discrimination and its Requirement of Quantum

Chao-Qian Pang, Fu-Lin Zhang, Li-Fang Xu, Mai-Lin Liang, Jing-Ling Chen
We study the procedure for sequential unambiguous state discrimination. A qubit is prepared in one of two possible states, and measured by two observers Bob and Charlie in order. A necessary condition for the state to be unambiguous discriminated by Charlie is the absence of entanglement between the principle qubit and Bob's auxiliary system. In general, this procedure for both Bob and Charlie to conclusive recognize between two nonorthogonal states relies on the availability of quantum discord which is precisely the quantum dissonance when the entanglement is absent. In the state in Bob's measurement, the left discord is positive correlated with the information extracted by Bob, and the right discord enhances the information leave to Charlie Their product achieves its maximum when occurs the optimal probability for both Bob and Charlie to identify the state.
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