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arXiv 1412.0809physics.optics
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硅纳米线的量子和经典双光子谱相关测量

Bi-photon spectral correlation measurements from a silicon nanowire in the quantum and classical regimes

Iman Jizan, L. G. Helt, Chunle Xiong, Matthew J. Collins, Duk-Yong Choi, Chang Joon Chae, Marco Liscidini, M. J. Steel, Benjamin J. Eggleton, Alex S. Clark

摘要:

在量子光学实验中,对具有特定光谱相关性的光子对的需求不断增长,这就要求快速、高分辨率和准确的源表征。这种表征的一种有希望的工具是使用经典的受激过程,其中附加的种子激光器刺激光子产生,产生更高的计数率,如最近在A.~.中的$χ^{(2)}$集成源所证明的。Eckstein \emph{et al.},激光光子。Rev. \textbf{8},L76(2014)。在这项工作中,我们将这些结果扩展到$χ^{(3)}$源,演示了通过受激四波混频的光谱相关测量的第一次在集成光波导,即硅纳米线。我们直接确认的速度,由于更高的计数率,并证明,额外的分辨率可以获得相比,传统的符合测量。由于泵浦脉冲宽度会影响光谱纠缠度,所以我们的测量都是在两种不同的泵浦脉冲宽度下进行的。这使我们能够确认,经典的受激过程正确地捕获的光谱纠缠度,无论泵浦脉冲的持续时间,并巩固其作为一个必不可少的表征方法,为未来的量子集成器件的发展。

英文摘要:

The growing requirement for photon pairs with specific spectral correlations in quantum optics experiments has created a demand for fast, high resolution and accurate source characterization. A promising tool for such characterization uses the classical stimulated process, in which an additional seed laser stimulates photon generation yielding much higher count rates, as recently demonstrated for a $χ^{(2)}$ integrated source in A.~Eckstein \emph{et al.}, Laser Photon. Rev. \textbf{8}, L76 (2014). In this work we extend these results to $χ^{(3)}$ sources, demonstrating spectral correlation measurements via stimulated four-wave mixing for the first time in a integrated optical waveguide, namely a silicon nanowire. We directly confirm the speed-up due to higher count rates and demonstrate that additional resolution can be gained when compared to traditional coincidence measurements. As pump pulse duration can influence the degree of spectral entanglement, all of our measurements are taken for two different pump pulse widths. This allows us to confirm that the classical stimulated process correctly captures the degree of spectral entanglement regardless of pump pulse duration, and cements its place as an essential characterization method for the development of future quantum integrated devices.

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