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Journal of Science of Teachers' College and University

Entanglement distillation for atomic states by local operation

Zhimin Liu

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

A physical scheme for atomic entangled states distillation is proposed via atom-cavity field interaction.Which is generalized to non-maximally entangled multi-atom states distillation.It is found from calculation outcome that the distillation probabilities of all kinds of entangled atomic states are the same, 2b 2.The advantage of the scheme is entangled distillation is realized through only introducing an auxiliary cavity and making a local operation.The scheme is simple and feasible in experiment.

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A physical scheme for atomic entangled states distillation is proposed via atom-cavity field interaction.Which is generalized to non-maximally entangled multi-atom states distillation.It is found from calculation outcome that the distillation probabilities of all kinds of entangled atomic states are the same, 2b 2.The advantage of the scheme is entangled distillation is realized through only introducing an auxiliary cavity and making a local operation.The scheme is simple and feasible in experiment.
In this paper, a physical scheme for remotely preparing a diatomic entangled state via a two-atom entangled state and a triatomical entangled W state is presented by applying the cavity quantum electrodynamics technique. The original state can be transmitted to either one of the receivers by introducing a auxiliary cavity. Two different kinds of atom-cavity interactions are utilized at the sender's and the receiver's site, respectively. The total success probability for each receiver is obtained, which will be equal in certain condition.
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.