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arXiv 2510.26337quant-ph
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通过混合单光子与激光光束对量子密钥分发进行基准测试

Benchmarking quantum key distribution by mixing single photons and laser light

Yann Portella, Petr Steindl, Juan Rafael Álvarez, Tim Hebenstreit, Aristide Lemaître, Martina Morassi, Niccolo Somaschi, Loïc Lanco, Filip Rozpędek, Pascale Sen… 展开作者

Yann Portella, Petr Steindl, Juan Rafael Álvarez, Tim Hebenstreit, Aristide Lemaître, Martina Morassi, Niccolo Somaschi, Loïc Lanco, Filip Rozpędek, Pascale Senellart, Dario A. Fioretto

AI总结:

本文提出一种混合单光子与激光脉冲执行BB84协议的方法,通过唯象分析揭示单光子无条件优势的效率阈值及纯度与亮度的相互作用,理论与实验高度匹配。

摘要:

量子密钥分发是量子力学的一项关键应用,正在塑造隐私与安全通信的未来。许多协议需要单光子,通常由强衰减激光脉冲来近似。在此,我们利用嵌入在微柱中的量子点的发射,并探索一种混合方法,其中信息被编码在单光子与激光脉冲的混合物上。我们对两种光源非相干混合以执行BB84协议的配置进行了唯象分析,结果显示理论与实验之间几乎完美匹配。这提供了一种灵活的技术,能够补偿单光子源有限的收集亮度,并对单光子统计相对于泊松分布统计的优势场景进行了全面研究。具体而言,我们的模型突出了单光子相对于激光的无条件优势的效率阈值,并深入揭示了单光子纯度与收集亮度在BB84性能中的相互作用。

英文摘要:

Quantum key distribution is a key application of quantum mechanics, shaping the future of privacy and secure communications. Many protocols require single photons, often approximated by strongly attenuated laser pulses. Here, we harness the emission of a quantum dot embedded in a micropillar and explore a hybrid approach where the information is encoded on a mixture of single photons and laser pulses. We derive a phenomenological analysis of the configuration where both sources of light are mixed incoherently to perform the BB84 protocol, showing nearly perfect matching between theory and experiment. This provides a flexible technology compensating limited collected brightnesses of single-photon sources as well as a thorough investigation of single-photon statistics advantage scenarios over Poisson-distributed statistics. Explicitly, our model highlights an efficiency threshold for unconditional advantage of single photons over laser along with insights on the interplay between single-photon purity and collected brightness in the performances of BB84.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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