Quantum-Dot-Based Telecommunication-Wavelength Quantum Relay
Quantum-Dot-Based Telecommunication-Wavelength Quantum Relay
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DOI：
10.1103/physrevapplied.8.024007
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发表时间：
2017-04
影响因子：
4.6
通讯作者：
J. Huwer;R. Stevenson;J. Skiba-Szymanska;M. B. Ward;A. Shields;M. Felle;I. Farrer;D. A. Ritchie-D.-A.-Ritchi
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文献类型：
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作者：
J. Huwer;R. Stevenson;J. Skiba-Szymanska;M. B. Ward;A. Shields;M. Felle;I. Farrer;D. A. Ritchie-D.-A.-Ritchi
©2017美国物理学会。在大多数实际实现中，使用弱相干激光脉冲运行的长距离和防攻击量子通信网络的量子中继的发展需要具有固有单光子发射的通信波长的纠缠光子源。利用半导体量子点在电信O波段发射纠缠光子对，我们演示了一个满足这两个条件的量子中继。该系统实现了由激光产生输入状态的标准四态协议的最高保真度为94.5%。我们进一步研究了对窄带输入频率失谐的鲁棒性，并对传送器进行了过程层析成像，揭示了任意纯输入状态下的操作，平均门保真度为83.6%。该结果突出了半导体光源在紧凑和强大的量子中继技术方面的潜力，该技术与现有的通信基础设施兼容。
© 2017 American Physical Society. The development of quantum relays for long-haul and attack-proof quantum communication networks operating with weak coherent laser pulses requires entangled photon sources at telecommunication wavelengths with intrinsic single-photon emission for most practical implementations. Using a semiconductor quantum dot emitting entangled photon pairs in the telecommunication O band, we demonstrate a quantum relay fulfilling both of these conditions. The system achieves a maximum fidelity of 94.5% for implementation of a standard four-state protocol with input states generated by a laser. We further investigate robustness against frequency detuning of the narrow-band input and perform process tomography of the teleporter, revealing operation for arbitrary pure input states, with an average gate fidelity of 83.6%. The results highlight the potential of semiconductor light sources for compact and robust quantum-relay technology that is compatible with existing communication infrastructures.