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双量子比特系统中纠缠的暗周期和恢复

Dark periods and revivals of entanglement in a two qubit system

Z. Ficek, R. Tanas

摘要:

在最近的一篇论文中,Yu和Eberly [Phys. Rev. Lett. { \bf 93},140404(2004)]已经表明,两个最初纠缠并且之后不相互作用的量子比特可以在有限时间内变得完全解纠缠。我们研究了集体耦合到多模真空场的两个量子比特之间的瞬态纠缠,发现了一个不寻常的特征,即不可逆的自发衰变可以导致已经被破坏的纠缠的复活。结果表明,这种特性与原子间的偶极-偶极相干相互作用无关,但与原子间是否存在集体阻尼有关。我们表明,通过自发发射的系统复活纠缠的能力依赖于存在非常不同的时间尺度的演化的群体的集体状态和它们之间的相干性。

英文摘要:

In a recent paper Yu and Eberly [Phys. Rev. Lett. {\bf 93}, 140404 (2004)] have shown that two initially entangled and afterwards not interacting qubits can become completely disentangled in a finite time. We study transient entanglement between two qubits coupled collectively to a multimode vacuum field and find an unusual feature that the irreversible spontaneous decay can lead to a revival of the entanglement that has already been destroyed. The results show that this feature is independent of the coherent dipole-dipole interaction between the atoms but it depends critically on whether or not the collective damping is present. We show that the ability of the system to revival entanglement via spontaneous emission relies on the presence of very different timescales for the evolution of the populations of the collective states and coherence between them.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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