Entanglement distillation for three-particleWclass states
Zhuo‐Liang Cao, Ming Yang · Journal of Physics B Atomic Molecular and Optical Physics · 2003
In this paper, we propose two general entanglement distillation protocols which can concentrate the state (non-maximally entangled pure W state). The general protocols are mainly based on the unitary transformation on the auxiliary particle and one of the three entangled particles, and in the second protocol, the entanglement distillation includes two meanings, namely, extracting the concentrated tripartite entangled W state and obtaining the maximally entangled bipartite state from the 'garbage' state, which gives no contribution to the distillation of the state. We can make use of the 'garbage' in the distillation process, and make the entanglement waste in the quantum communication as small as possible. A feasible physical scheme is suggested based on the cavity QED.