Scheme for purifying a general mixed entangled state and its linear optical implementation
Dong Dong, Yan‐Lei Zhang, Chang‐Ling Zou, Xu‐Bo Zou, Guang-Can Guo · Chinese Physics B · 2015
We propose a scheme for purification of a general mixed entangled state. In this scheme, we start from a large number of general mixed entangled states and end up, after local operation and classical communication, with a smaller number of Bell diagonal states with higher entanglement. In particular, the scheme can purify one maximally entangled state from two entangled pairs prepared in a class of mixed entangled state. Furthermore we propose a linear optical implementation of the present scheme with polarization beam splitters and photon detectors.