Reconstruction of bipartite states via unambiguous state discrimination and mutually unbiased measurement

Reconstruction of bipartite states via unambiguous state discrimination and mutually unbiased measurement
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通过明确的国家歧视和相互公正的衡量来重建两党国家

DOI:
10.1007/s11128-014-0857-0
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发表时间:
2015
影响因子:
2.5
通讯作者:
Cao, Zhuo-Liang
Cao, Zhuo-Liang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Han, Lian-Fang;Yang, Ming;Fang, Shu-Dong;Cao, Zhuo-Liang

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We propose a scheme for reconstructing an unknown two-particle mixed state by means of unambiguous state discrimination. In this protocol, an ancillary particle is introduced for distinguishing four nonorthogonal states. The discrimination process is performed by a bipartite unitary operation on the two-particle system and the ancilla followed by a von Neumann measurement on the ancilla. Then the original two-particle system is measured in mutually unbiased bases. Consequently, the two-particle mixed state can be reconstructed. Furthermore, the total number of measurements in this protocol is less than that of the standard quantum tomography, thus the quantum resources is saved. Additionally, the nonorthogonal states discrimination and mutually unbiased measurement can be experimentally achieved, therefore our protocol may be realized with the current technology.
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