Abstract

We present a simple protocol to purify bipartite entanglement in spin-1/2 particles by utilizing only natural spin-spin interactions and S_z-measurements on single spins. It is shown that only one switching on (and off) of a multi-spin interaction, as well as single spin operations, is sufficient for purify entanglement. This approach significantly reduces the number of controls that would induce errors compared with conventional purification protocols and it could be useful for quantum information processing in solid-state-based systems.

© 2008 Optical Society of America