Protecting remote atomic entanglement against spontaneous emission by separated photonic pulses
Protecting remote atomic entanglement against spontaneous emission by separated photonic pulses
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DOI：
10.1088/1054-660x/25/7/075203
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发表时间：
2015-06
期刊：
影响因子：
1.2
通讯作者：
Xiao-Lan Zong;Chao-Qun Du;Ming Yang;Gang Zhang;Qing Yang;Z. Cao
中科院分区：
文献类型：
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作者：
Xiao-Lan Zong;Chao-Qun Du;Ming Yang;Gang Zhang;Qing Yang;Z. Cao
我们研究了两个空间分离的原子在两个独立光腔中的纠缠动力学。基于原子与分离的光子脉冲之间的腔辅助相互作用，提出了一种在原子与光子脉冲之间实现受控相位翻转门（CPF门）的方案，以保护原子间的量子纠缠不受自发辐射引起的衰减.我们需要做的是将水平偏振的光子连续地射到腔镜上，再对原子进行一系列的阿达玛运算，这里不需要测量。结果表明，这种方法可以有效地保护两个原子之间的量子纠缠。我们也将我们的方案推广到弱耦合和低Q腔的情况。当前方案的简单性可能保证其实验实现。
We study the entanglement dynamics between two spatially separated atoms trapped in two separate optical cavities. Based on cavity-assisted interactions between the atoms and separated photonic pulses, we propose a scheme for the implemention of a controlled-phase-flip gate (CPF gate) between each of the atoms and the photonic pulse to protect the remote atomic quantum entanglement against the decaying caused by spontaneous emission. What we need to do is to shoot the horizontally polarized photons onto the cavity mirror successively, plus a train of Hadamard operations on the atoms, and no measurement is needed here. It is shown that the quantum entanglement of the two remote atoms can be protected effectively in this way. We also extend our scheme to the case of weak coupling and low Q cavity cases. The simplicity of the current scheme may warrant its experimental realization.