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Chinese Physics Letters

Establishment of Entanglement for Two Atoms Trapped in Two Distant Bad Cavities

卢道明, 郑仕标

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

一个计划在二个远坏洞为二 atomstrapped 为纠缠的状态的产生被介绍。计划能与比洞腐烂率小的 couplingstrength 与坏洞工作，它从实验的观点是重要的。Inthe 计划原子没有处于激动的状态并且这样被占据的概率 theatomic 自发的排放被压制，它增加成功的概率。fidelityof 而且，纠缠的状态没被察觉效率影响计划同时做 notrequire 极化左的光子和极化权利的光子的察觉。

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一个计划在二个远坏洞为二 atomstrapped 为纠缠的状态的产生被介绍。计划能与比洞腐烂率小的 couplingstrength 与坏洞工作，它从实验的观点是重要的。Inthe 计划原子没有处于激动的状态并且这样被占据的概率 theatomic 自发的排放被压制，它增加成功的概率。fidelityof 而且，纠缠的状态没被察觉效率影响计划同时做 notrequire 极化左的光子和极化权利的光子的察觉。
考虑将w态中的两个二能级原子分别注人用光纤连接的耦合腔A和B中，并且原子与腔场发生共振相互作用的情况。采用Negativity熵来描述两子系统间的纠缠，研究了原子一腔一光纤复合系统中腔场间的纠缠特性。利用数值计算方法，通过对是否进行腔外原子的选择性测量情况下腔场与腔场间的纠缠的比较，讨论了对腔外原子的选择性测量和原子与腔场间的耦合系数变化对纠缠特性的影响。研究结果表明，对腔外原子的选择性测量可增强腔场与腔场间的纠缠，另一方面，随原子与腔场间的耦合系数增大腔场间纠缠增强。
A scheme is presented for generation of entangled states for two atoms trapped in two distant bad cavities. The scheme can work with bad cavities with the coupling strength smaller than the cavity decay rate, which is important from the viewpoint of experiment. In the scheme the atoms have no probability of being populated in the excited state and thus the atomic spontaneous emission is suppressed, which increases the probability of success. The fidelity of the entangled state is not affected by the detection efficiency. Furthermore, the scheme does not require the detection of the left-polarized photon and right-polarized photon at the same time.
We describe a series of experiments showing how a single trapped ion, which interacts with its own resonance fluorescence via a distant mirror, exhibits cavity-QED effects such as modified spontaneous emission, level shifts, and even mechanical forces. The same interaction is used to establish feedback on the ion's quantum motion, providing additional cooling and phase stabilisation of its vibration in the trap. Based on these methods and results we present an experiment dedicated at creating entanglement between two distant ions by projective measurements.