Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters
Two-photon interference in the telecom C-band after frequency conversion of photons from remote quantum emitters
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DOI：
10.1038/s41565-018-0279-8
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发表时间：
2018-03
影响因子：
38.3
通讯作者：
J. Weber;Benjamin Kambs;J. Kettler;S. Kern;J. Maisch;H. Vural;M. Jetter;S. Portalupi;C. Becher;P. Michler
中科院分区：
文献类型：
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作者：
J. Weber;Benjamin Kambs;J. Kettler;S. Kern;J. Maisch;H. Vural;M. Jetter;S. Portalupi;C. Becher;P. Michler
通过量子中继器的高效光纤远程量子通信依赖于电信波长的确定性单光子源，有可能利用现有的全球基础设施。为了提高量子网络实验的复杂性，在低损耗电信频带中远程非经典发射体的双光子干扰（TPI）是至关重要的。对不同发射体的TPI进行了若干实验，例如，利用捕获原子、离子、氮空位中心、硅空位中心、有机分子和半导体量子点。然而，光谱范围远没有达到电信c波段的高度要求。在这里，我们利用量子频率转换来实现来自两个远程量子点的单光子在1,550 nm处的TPI。因此，我们证明了量子频率转换作为一种桥接技术和一种精确而稳定的机制来消除独立发射器之间的频率差异。在共振上，观察到的TPI可见度为29±3%，仅受单个量子点的光谱扩散过程的限制。使用的本地光纤网络覆盖了建筑物两层之间的几个房间。即使增加2千米的光纤通道，对TPI可见性也没有影响，证明光子波包畸变可以忽略不计。我们的研究为建立远程固体发射体之间的长距离纠缠分布铺平了道路，包括与各种量子混合系统的界面，-。
Efficient fibre-based long-distance quantum communication via quantum repeaters relies on deterministic single-photon sources at telecom wavelengths, potentially exploiting the existing world-wide infrastructures. For upscaling the experimental complexity in quantum networking, two-photon interference (TPI) of remote non-classical emitters in the low-loss telecom bands is of utmost importance. Several experiments have been conducted regarding TPI of distinct emitters, for example, using trapped atoms, ions, nitrogen vacancy centres,, silicon vacancy centres, organic molecules and semiconductor quantum dots,. However, the spectral range was far from the highly desirable telecom C-band. Here, we exploit quantum frequency conversion to realize TPI at 1,550 nm with single photons stemming from two remote quantum dots. We thereby prove quantum frequency conversion, –as a bridging technology and a precise and stable mechanism to erase the frequency difference between independent emitters. On resonance, a TPI visibility of 29 ± 3% has been observed, limited only by the spectral diffusion processes of the individual quantum dots,. The local fibre network used covers several rooms between two floors of the building. Even the addition of up to 2 km of fibre channel shows no influence on the TPI visibility, proving the photon wavepacket distortion to be negligible. Our studies pave the way to establish long-distance entanglement distribution between remote solid-state emitters including interfaces with various quantum hybrid systems, –.