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Communications in Theoretical Physics

Scheme for Robust Storage of Multi-particle Entanglement with a Cavity QED System

Changyong Chen, Shaohua Li, Kelin Gao

Published Oct 1, 2006• 0 citations
Publisher

Abstract

We propose a scheme for robustly storing multi-atom entangled states involving Bell states, three-particle W -state, n -particle W -like-states, generalized multi-particle W -states, n -particle GHZ-states, and partially entangled states in cavity QED. Our scheme can preserve the internal structure of the entangled states above, with only generation of a global phase corresponding to each of entangled states during the storage of them. One single-mode cavity and n identical two-level atoms are required. Our scheme may be realized in the present technology. The idea may be also utilized to store multi-trapped-ion entangled states in linear ion trap.

DOI
10.1088/0253-6102/46/4/011

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We propose a scheme for robustly storing multi-atom entangled states involving Bell states, three-particle W -state, n -particle W -like-states, generalized multi-particle W -states, n -particle GHZ-states, and partially entangled states in cavity QED. Our scheme can preserve the internal structure of the entangled states above, with only generation of a global phase corresponding to each of entangled states during the storage of them. One single-mode cavity and n identical two-level atoms are required. Our scheme may be realized in the present technology. The idea may be also utilized to store multi-trapped-ion entangled states in linear ion trap.
我们建议为要用体力地存储多原子的一个计划纠缠了在洞证完包含贝尔状态，三粒子的 W 状态， n 粒子 W-like-states，概括 multi-particleW-states， n 粒子 GHZ 状态，和部分纠缠的状态的状态。我们的计划能保存上面的纠缠的状态的 interned 结构，与仅仅相应于每在他们的存储期间的纠缠的状态的一个全球阶段的产生。一个单个模式的洞和 n 相同二水平的原子被要求。我们的计划可以在现在的技术被认识到。这个想法可以也被利用存储在线性离子的纠缠的状态套住的 multi-trapped-ion。
A scheme is presented for generating entangled states for two atoms in a cavity. In the scheme two atoms simultaneously interact with a cavity mode with a small detuning. The operation time is very short and thus the decoherence can be effectively suppressed. Furthermore, the scheme is valid no matter whether the two atoms have the same coupling strengths or not. The scheme can be used to generate multi-atom W states without the requirement of individual addressing of the atoms, which is also experimentally important. The scheme can also be generalized to produce entangled states in an ion trap without individually addressing the ions.
We propose a scheme for realizing quantum entanglement swapping between the atoms in cavity QED. With only virtual excitation of the cavity during the interaction between the atoms and cavity, the scheme is insensitive to the cavity mode states and the cavity decay. The ideas can also be utilized for realizing entanglement swapping between the atomic levels in a single atom and the atomic levels in the Bell states and between the atomic levels in the Bell states and the atomic levels in the W states.
Dense coding of multi-atom entangled states in cavity QED is studied. If the quantum channel is generalized GHZ states, dense coding can be directly realized in a simply way. As for the partially entangled pure states, we propose a feasible protocol for entanglement concentration, and the efficiency of information transmitted is calculated. The schemes are insensitive to the cavity decay and the field state, due to the fact that the interaction here is a large-detuned one between atoms and the cavity.