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arXiv 1608.02641quant-phcond-mat.mes-hallphysics.optics
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片上独立腔耦合辐射源的双光子干涉

Two-photon interference from independent cavity-coupled emitters on-a-chip

Je-Hyung Kim, Christopher J. K. Richardson, Richard P. Leavitt, Edo Waks

摘要:

固态量子发射体和腔体之间的相互作用对于量子通信、线性光学量子计算、非线性光子学和光子量子模拟中的广泛应用是重要的。这些应用通常需要在单个芯片上组合具有相同发射波长的许多器件,以产生双光子干涉,这是实现有效光子-光子相互作用的主要机制。由于不均匀加宽和制造误差使发射器和腔体的谐振频率随机化,这种集成仍然极具挑战性。在这封信中,我们展示了来自同一芯片上的独立腔耦合发射器的双光子干涉,为这个长期存在的问题提供了一个潜在的解决方案。我们克服了由于制造误差不同的腔之间的光谱失配沉积和局部蒸发一薄层的冷凝氮。我们集成了光学加热器,将每个腔体内的各个点调谐到相同的谐振,精度优于3 μeV。结合这些调谐方法,我们证明了在同一芯片上间隔小于15 μm的两个器件之间的双光子干涉,选择后的可见度为33%。这些结果为在同一芯片上集成多个量子光源以开发量子光子器件铺平了道路。

英文摘要:

Interactions between solid-state quantum emitters and cavities are important for a broad range of applications in quantum communication, linear optical quantum computing, nonlinear photonics, and photonic quantum simulation. These applications often require combining many devices on a single chip with identical emission wavelengths in order to generate two-photon interference, the primary mechanism for achieving effective photon-photon interactions. Such integration remains extremely challenging due to inhomogeneous broadening and fabrication errors that randomize the resonant frequencies of both the emitters and cavities. In this letter we demonstrate two-photon interference from independent cavity-coupled emitters on the same chip, providing a potential solution to this long-standing problem. We overcome spectral mismatch between different cavities due to fabrication errors by depositing and locally evaporating a thin layer of condensed nitrogen. We integrate optical heaters to tune individual dots within each cavity to the same resonance with better than 3 μeV of precision. Combining these tuning methods, we demonstrate two-photon interference between two devices spaced by less than 15 μm on the same chip with a post-selected visibility of 33%. These results pave the way to integrate multiple quantum light sources on the same chip to develop quantum photonic devices.

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