Entanglement distillation for three-particle W class states

Details Entanglement distillation for three-particle W class states Entanglement distillation for three-particle W class states

2003-10-20

arxiv.org/abs/quant-ph/0310118v1

Journal of Physics B: Atomic, Molecular & Optical Physics, volume 36, issue 21, pages 4245 - 4253, 2003

Physics

Quantum Physics

15 pages 2 figures

Scientific paper

10.1088/0953-4075/36/21/005

In this paper, we propose two general entanglement distillation protocols, which can concentrate the non-maximally entangled pure W class 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 non-maximally entangled pure W class state. We can make use of the garbage in the distillation process, and make the entanglement waste in quantum communication as small as possible. A feasible physical scheme is suggested based on the cavity QED.

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