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arXiv quant-ph/0610188quant-ph
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利用共振非对称原子-腔耦合产生两原子最大纠缠混合态

Generation of maximally entangled mixed states of two atoms via on-resonance asymmetric atom-cavity couplings

Shang-Bin Li

摘要:

提出了一种制备两原子与单模光腔场非对称共振耦合的最大纠缠混合态的方案。通过适当控制两原子间的耦合强度比,演化的约化密度矩阵可以近似地到达最大纠缠混合态和最大Bell破坏混合态的部分前沿.在单粒子激发和非对称耦合的情况下,当且仅当耦合强度比介于$\frac{\sqrt{3}}{3}$和$\sqrt{3}$之间时,交换对称性破缺,而这种交换对称性破缺不能通过检测最大Bell破坏来验证.

英文摘要:

A scheme for generating the maximally entangled mixed state of two atoms on-resonance asymmetrically coupled to a single mode optical cavity field is presented. The part frontier of both maximally entangled mixed states and maximal Bell violating mixed states can be approximately reached by the evolving reduced density matrix of two atoms if the ratio of coupling strengths of two atoms is appropriately controlled. It is also shown that exchange symmetry of global maximal concurrence is broken if and only if coupling strength ratio lies between $\frac{\sqrt{3}}{3}$ and $\sqrt{3}$ for the case of one-particle excitation and asymmetric coupling, while this partial symmetry-breaking can not be verified by detecting maximal Bell violation.

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