关键词: 非局域Bell-态测量, 最大纠缠对, 部分纠缠对, 酉变换, 提纯

Abstract: A perfect protocol is put forward for implementation of nonlocal Bell-state measurement by using pre-shared maximally entangled pair and Local Operations as well as Classical Communication（LOCC）, then it is generalized by using partially entangled channel instead of maximally entangled channel, and shows that the nonlocal Bell-state measurement can be performed probabilistically by introducing a unitary transformation, and the generalized scheme can be regarded as a purification scheme. Subsequently, this paper discusses the required resources for these protocols and reveals the experimental feasibility of the schemes with the current technologies. In addition, the protocols can be used to generate some new maximally quantum entangled states.

Key words: nonlocal Bell-state measurement, maximally entangled pair, partially entangled pair, unitary transformation, purification