期刊
PHYSICAL REVIEW A
卷 82, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.82.032318
关键词
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资金
- National Natural Science Foundation of China [10775076, 10874098, 10974020]
- National Basic Research Program of China [2006CB921106, 2009CB929402]
- China Postdoctoral Science Foundation [20090460365]
- Specialized Research Fund for the Doctoral Program of Education Ministry of China [20060003048]
It is impossible to unambiguously distinguish the four Bell states in polarization, resorting to linear optical elements only. Recently, the hyperentangled Bell state, the simultaneous entanglement in more than one degree of freedom, has been used to assist in the complete Bell-state analysis of the four Bell states. However, if the additional degree of freedom is qubitlike, one can only distinguish 7 from the group of 16 states. Here we present a way to distinguish the hyperentangled Bell states completely with the help of cross-Kerr nonlinearity. Also, we discuss its application in the quantum teleportation of a particle in an unknown state in two different degrees of freedom and in the entanglement swapping of hyperentangled states. These applications will increase the channel capacity of long-distance quantum communication.
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