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arXiv 1402.6967quant-phcond-mat.mes-hallphysics.optics
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光子晶体腔中高纯度单光子从相干量子点的有效耦合输出

Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity

K. H. Madsen, S. Ates, J. Liu, A. Javadi, S. M. Albrecht, I. Yeo, S. Stobbe, P. Lodahl

摘要:

我们证明了在光子晶体腔的低Q模式下,$(44.3\pm2.1)\%$从量子点的单光子收集效率,记录的单光子纯度为$g^{(2)}(0)=(4\pm5)\%$高于饱和功率。通过在耦合到腔模的另一个量子点上的单光子探测器上每秒探测高达$962\pm46$千计数,直接证实了高效率。高收集效率被发现是宽带的,详细的数值模拟解释。腔增强的有效激发的量子点是通过声子介导的激发,并在这些条件下,单光子不可逆性测量显示长的相干时间达到$0.77\pm0.19$ ns在弱激发制度。我们的工作表明,光子晶体提供了一个非常有前途的平台,高度集成的相干单光子的产生,包括有效的光子从光子芯片的耦合。

英文摘要:

We demonstrate a single-photon collection efficiency of $(44.3\pm2.1)\%$ from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of $g^{(2)}(0)=(4\pm5)\%$ recorded above the saturation power. The high efficiency is directly confirmed by detecting up to $962\pm46$ kilocounts per second on a single-photon detector on another quantum dot coupled to the cavity mode. The high collection efficiency is found to be broadband, as is explained by detailed numerical simulations. Cavity-enhanced efficient excitation of quantum dots is obtained through phonon-mediated excitation and under these conditions, single-photon indistinguishability measurements reveal long coherence times reaching $0.77\pm0.19$ ns in a weak-excitation regime. Our work demonstrates that photonic crystals provide a very promising platform for highly integrated generation of coherent single photons including the efficient out-coupling of the photons from the photonic chip.

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