Telecom-wavelength quantum relay using a semiconductor quantum dot
Telecom-wavelength quantum relay using a semiconductor quantum dot
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DOI：
10.1364/cleo_qels.2017.ff2e.7
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
J. Huwer;M. Felle;R. Stevenson;J. Skiba-Szymanska;M. Ward;I. Farrer;R. Penty;D. Ritchie;A. Shi
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文献类型：
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作者：
J. Huwer;M. Felle;R. Stevenson;J. Skiba-Szymanska;M. Ward;I. Farrer;R. Penty;D. Ritchie;A. Shi
一种有望实现具有不可信节点的长距离量子通信网络的有前途的技术是量子中继。它们最实用的实现需要一个在电信波长和本征单光子特性的纠缠源。在这里，我们使用一个在O波段发射的半导体量子点来首次展示一个满足这两个标准的系统。对于一个标准的四态QKD协议的实施与弱相干输入状态，系统实现了88%以上的平均准确度。过程层析成像的继电器的进一步表征揭示了任意输入状态的隐形传态。这些结果在证明半导体光源用于开发多节点网络的基础设施兼容量子通信技术的可行性方面取得了重大进展。
One promising technology expected to enable long-haul quantum communication networks with untrusted nodes are quantum relays. Their most practical implementation requires an entanglement source with operation at telecom wavelength and intrinsic single photon character. Here, we use a semiconductor quantum dot emitting in the O-band to demonstrate for the first time a system fulfilling both of these criteria. For implementation of a standard 4-state QKD-protocol with weak coherent input states, the system achieves mean fidelities above 88%. Further characterization of the relay with process tomography reveals teleportation for arbitrary input states. The results represent a significant advance in demonstrating feasibility of semiconductor light sources for the development of infrastructure-compatible quantum-communication technology for multi-node networks.