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arXiv 2405.03377quant-phphysics.optics
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室温下利用胶体量子点单光子的轨道角动量实现高维量子密钥分发

High-dimensional quantum key distribution using orbital angular momentum of single photons from a colloidal quantum dot at room temperature

Dotan Halevi, Boaz Lubotzky, Kfir Sulimany, Eric G. Bowes, Jennifer A. Hollingsworth, Yaron Bromberg, Ronen Rapaport

AI总结:

本文利用室温胶体巨量子点作为确定性单光子源,在轨道角动量三维空间中实现高维量子密钥分发,并实验证明每光子安全比特数超过传统二维QKD容量。

摘要:

高维量子密钥分发(HDQKD)是解决基本QKD协议固有局限性的一个有前景的方向。然而,迄今为止HDQKD的实验实现依赖于不确定性的光子源,这限制了可实现的密钥率。在本文中,我们展示了一个完整的HDQKD系统仿真,使用单个胶体巨量子点(gQD)作为确定性、紧凑且室温运行的单光子源(SPS)。我们通过将信息编码在光子轨道角动量的高维空间(d = 3)中,演示了一种实用协议。我们的实验配置包含两个空间光调制器,用于编码和解码单个光子携带的空间信息。我们的实验演示确立了利用高辐射量子产率gQD作为HDQKD实用SPS的可行性。我们还通过实验证明了安全的qudit传输,每光子超过一个安全比特,从而已经超越了传统d=2 QKD的容量。

英文摘要:

High-dimensional quantum key distribution (HDQKD) is a promising avenue to address the inherent limitations of basic QKD protocols. However, experimental realizations of HDQKD to date have relied on indeterministic photon sources that limit the achievable key rate. In this paper, we demonstrate a full emulation of a HDQKD system using a single colloidal giant quantum dot (gQD) as a deterministic, compact and room-temperature single-photon source (SPS). We demonstrate a practical protocol by encoding information in a high-dimensional space ($d = 3$) of the orbital angular momentum of the photons. Our experimental configuration incorporates two spatial light modulators for encoding and decoding the spatial information carried by individual photons. Our experimental demonstration establishes the feasibility of utilizing high radiative quantum yield gQDs as practical SPSs for HDQKD. We also demonstrate experimentally secure qudit transmission exceeding one secure bit per photon, thus already beating the traditional d=2 QKD capacity.

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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