期刊
QUANTUM INFORMATION PROCESSING
卷 12, 期 11, 页码 3511-3525出版社
SPRINGER
DOI: 10.1007/s11128-013-0613-x
关键词
Ancilla-free phase-covariant teleclong; Remote information concentration; Three-qubit asymmetric entangled W state; Nonmaximally entangled W state; Projective measurement; POVM
In this paper, we investigate generalized remote information concentration as the reverse process of ancilla-free phase-covariant telecloning (AFPCT) which is different from the reverse process of optimal universal telecloning. It is shown that the quantum information via 1 -> 2 AEPCT procedure can be remotely concentrated back to a single qubit with a certain probability by utilizing (non-)maximally entangled W states as quantum channels. Our protocols are the generalization of Wang's scheme (Open JMicrophys 3: 18-21. doi:10.4236/ojm.2013.31004,2013). And von Neumann measure and positive operator-valued measurement are performed in the maximal and non-maximal cases respectively. Relatively the former, the dimension of measurement space in the latter is greatly reduced. It makes the physical realization easier and suitable.
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