Coherent generation of time-bin entangled photon pairs using the biexciton cascade and cavity-assisted piecewise adiabatic passage
Coherent generation of time-bin entangled photon pairs using the biexciton cascade and cavity-assisted piecewise adiabatic passage
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DOI：
10.1103/physrevb.83.245301
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发表时间：
2011-06-03
影响因子：
3.7
通讯作者：
Hughes, S.
中科院分区：
文献类型：
--
作者：
Pathak, P. K.;Hughes, S.
提出了一种利用腔辅助分段绝热传输在单量子点中实现时间仓纠缠光子对的确定性固态源的方案。量子点嵌入半导体微腔中，两个时间上分离的输入脉冲的相干叠加与腔模的相互作用导致了一个分段绝热通道，通过双激子-激子级联产生了一个时间仓纠缠光子对.我们表明，所产生的状态的纠缠可以测量使用三重符合检测，我们量化的纠缠程度，通过干涉的可见性。我们还讨论了纯退相对产生的光子对纠缠度的影响。在三重符合测量中使用实验可实现的参数预测了大于1/根2的明显的干涉可见度值，表明所产生的光子可以适用于诸如贝尔不等式违反和量子密码学的应用。
We present a scheme to realize a deterministic solid-state source of time-bin entangled photon pairs using cavity-assisted piecewise adiabatic passage in a single quantum dot. The quantum dot is embedded inside a semiconductor microcavity, and the interaction of a coherent superposition of two temporally separated input pulses and the cavity mode leads to a piecewise adiabatic passage, which produces a time-bin entangled photon pair through the biexciton-exciton cascade. We show that the entanglement of the generated state can be measured using triple coincidence detection, and we quantify the degree of entanglement through the visibility of the interference. We also discuss the influence of pure dephasing on the entanglement of the generated photon pair. Pronounced interference visibility values of greater than 1/root 2 are predicted in triple coincidence measurement using experimentally achievable parameters, demonstrating that the generated photons could be suitable for applications such as Bell's inequality violation and quantum cryptography.