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arXiv 2408.14768quant-ph
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使用被动高强度纠缠光子对源的卫星QKD策略

Strategy of satellite QKD with passive high brightness entangled photon pair source

Jin-Woo Kim, Suseong Lim, Heonoh Kim, June-Koo Kevin Rhee

AI总结:

提出HBEPP分布解析模型,建议SQKD系统使用被动强度HBEPP源,将平均光子数固定为0.1,实现理想协议99.7%的性能。

摘要:

高强度纠缠光子对(HBEPP)源是在卫星与地面站之间进行基于纠缠的量子密钥分发(QKD)的关键。尽管超亮源能克服卫星QKD(SQKD)中的巨大损耗并提升筛选密钥率,但它也会引发多光子效应,从而提高系统误码率。为准确评估系统性能,我们首先提出一种解析模型,用于计算HBEPP通过非对称损耗信道分布的测量概率。基于该模型,我们提出在SQKD系统中使用被动强度HBEPP源,假设信道与偏振无关并使用阈值探测器进行测量。我们证实,将平均光子数固定为$\arμ=0.1$,可实现相比理想单向通信基于纠缠的SQKD协议$99.7\%$的性能,这实际上是根据系统损耗有效优化了HBEPP源亮度。

英文摘要:

A high-brightness entangled photon pair (HBEPP) source is essential for conducting entanglement-based quantum key distribution (QKD) between a satellite and a ground station. While an ultrabright source can overcome significant losses in satellite-based QKD (SQKD) and increase the sifted key rate, it also induces the multi-photon effect, raising the system's error rate. To accurately estimate system performance, we first present an analytical model for calculating the measurement probabilities of HBEPP distribution through an asymmetric loss channel. Based on this model, we propose the use of a passive-intensity HBEPP source for SQKD systems, assuming a polarization-independent channel and threshold detectors for measurement. We confirm that fixing the mean photon number at $\barμ=0.1$ achieves a performance of $99.7\%$ compared to the ideal one-way communication entanglement-based SQKD protocol, which is effectively optimizing the HBEPP source brightness in accordance with system losses.

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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