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理论物理通讯：英文版

Scheme for Entanglement Generation of Two Atoms in Two Bad Cavities

Zhang, Lihua , Cao, Zhuo-Liang

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

我们在场为由使用极化的光子的干扰的二原子的纠缠的状态的产生的一个计划。计划不要求在原子状态和 photonic 状态之间的完全的印射，它也不要求在原子和洞之间的最大的纠纷的建立。并且联合力量的原子洞比洞腐烂率小。这极大地在洞质量上放松要求。计划为 non-post-selection 结果，计划的所有步在当前的技术以内。

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我们在场为由使用极化的光子的干扰的二原子的纠缠的状态的产生的一个计划。计划不要求在原子状态和 photonic 状态之间的完全的印射，它也不要求在原子和洞之间的最大的纠纷的建立。并且联合力量的原子洞比洞腐烂率小。这极大地在洞质量上放松要求。计划为 non-post-selection 结果，计划的所有步在当前的技术以内。
We present a scheme for generation of two-atomic entangled state by using the interference of polarized photons. The scheme does not require complete mapping between the atomic state and the photonic state, nor does it require the establishment of maximal entanglement between the atom and the cavity. And the atom-cavity coupling strength is smaller than the cavity decay rate. This greatly relaxes the requirement on the cavity quality. The scheme is for non-post-selection results and all the steps of the scheme are within the current technologies.
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 propose an optical cavity-QED scheme for the deterministic generation of polarization entangled photon pairs that operates with high fidelity even in the bad cavity limit. The scheme is based on the interaction of an excited four-level atom with two empty optical cavity modes via an adiabatic passage process. Monte-Carlo wave function simulations are used to evaluate the fidelity of the cavity-QED source and its entanglement capability in the presence of decoherence. In the bad cavity limit, fidelities close to one are predicted for state-of-the-art experimental parameter values.
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。