Efficient single-photon frequency conversion using a Sagnac interferometer
Efficient single-photon frequency conversion using a Sagnac interferometer
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DOI：
10.1117/12.2004805
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
M. Bradford;Jung-Tsung Shen
中科院分区：
文献类型：
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作者：
M. Bradford;Jung-Tsung Shen
我们提出了一个量子纳米光子方案，以实现有效的单光子频率转换。这种机制对于集成纳米光子学是必不可少的，因为它可以提供对目前没有单光子源的频率范围的访问。此外，这样的设备可以用作光子频移键控量子信息方案的基础。提出的方案使用Sagnac干涉仪利用三能级量子点中两个跃迁路径之间的量子干涉。在该方案中，输入光子在λ型量子点上诱导完全的布居态转移，导致输出光子的频率偏移。Sagnac干涉仪用于将输入光子置于在量子点处干涉的反向传播状态的叠加中，提供必要的量子干涉以使该过程有效。我们已经开发了一个实空间的理论方法和一个计算有效的伪谱数值方法invigtigate完整的时空动力学的散射过程。它示出的频率转换过程的效率接近统一的理想情况下，即使在现实的耗散的存在下，是大于80%。
We present a quantum nanophotonic scheme to achieve efficient single-photon frequency conversion. This mechanism is essential for integrated nanophotonics, as it can provide access to frequency regimes in which no single-photon sources are currently available. Moreover, such a device could be used as the basis of a photonic frequency-shift-keyed quantum information scheme. The proposed scheme uses a Sagnac interferometer to exploit quantum interference between two transition pathways in a three-level quantum dot. In the proposed scheme, an input photon induces a complete population state transfer on the Lambda-type quantum dot, causing a frequency shift in the outgoing photon. The Sagnac interferometer is used to put the input photon into a superposition of counterpropagating states which interfere at the quantum dot, providing the necessary quantum interference to make the process efficient. We have developed a real-space theoretical approach and a computationally efficient pseudospectral numerical method to invegtigate the full spatiotemporal dynamics of the scattering process. It is shown that the efficiency of the frequency-conversion process approaches unity in the ideal case, and is greater than 80% even in the presence of realistic dissipation.