论文标题

用量子点单光子源增强量子密码学

Enhancing quantum cryptography with quantum dot single-photon sources

论文作者

Bozzio, Mathieu, Vyvlecka, Michal, Cosacchi, Michael, Nawrath, Cornelius, Seidelmann, Tim, Loredo, Juan Carlos, Portalupi, Simone Luca, Axt, Vollrath Martin, Michler, Peter, Walther, Philip

论文摘要

量子密码学利用量子光,尤其是单个光子,以提供可通过经典手段实现的安全保证。对于每个加密任务,感兴趣的安全功能与光子的非古典属性直接相关。基于量子点的单光子源是显着的候选者,正如它们原则上可以确定性地发出的,具有高亮度和低多光子的贡献。在这里,我们表明,由于发射的光子数状态下连贯性的可调性,这些来源可提供其他安全益处。我们确定了主要量子元素原始基底的最佳光学泵送方案,并根据泊松分布的来源(例如衰减的激光状态和下调源来源)对其性能进行基准测试。特别是,我们详细介绍了使用声子辅助和两光子激发的优势,而不是用于量子键分布和其他原始素的共振激发。提出的结果将指导针对量子通信任务量身定制的光子源的固态和量子信息科学的未来发展。

Quantum cryptography harnesses quantum light, in particular single photons, to provide security guarantees that cannot be reached by classical means. For each cryptographic task, the security feature of interest is directly related to the photons' non-classical properties. Quantum dot-based single-photon sources are remarkable candidates, as they can in principle emit deterministically, with high brightness and low multiphoton contribution. Here, we show that these sources provide additional security benefits, thanks to the tunability of coherence in the emitted photon-number states. We identify the optimal optical pumping scheme for the main quantum-cryptographic primitives, and benchmark their performance with respect to Poisson-distributed sources such as attenuated laser states and down-conversion sources. In particular, we elaborate on the advantage of using phonon-assisted and two-photon excitation rather than resonant excitation for quantum key distribution and other primitives. The presented results will guide future developments in solid-state and quantum information science for photon sources that are tailored to quantum communication tasks.

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