A quantum key distribution testbed using a plug&play telecom-wavelength single-photon source

量子密钥分配 试验台 计算机科学 量子信息科学 量子信道 光子 BB84 物理 量子网络 单光子源 密钥生成 光电子学 光学 电子工程 量子 量子信息 量子纠缠 计算机网络 量子力学 加密
作者
T. Gao,Lucas Rickert,Felix Urban,Jan Große,Nicole Srocka,Sven Rodt,Anna Musiał,Kinga Zolnacz,Pawel Mergo,Kamil Dybka,Waclaw Urbanczyk,Grzegorz Sęk,Sven Burger,Stephan Reitzenstein,Tobias Heindel
出处
期刊:Applied physics reviews [American Institute of Physics]
卷期号:9 (1): 011412-011412 被引量:8
标识
DOI:10.1063/5.0070966
摘要

Deterministic solid-state quantum light sources are considered key building blocks for future communication networks. While several proof-of-principle experiments of quantum communication using such sources have been realized, most of them required large setups often involving liquid helium infrastructure or bulky closed-cycle cryotechnology. In this work, we report on the first quantum key distribution (QKD) testbed using a compact benchtop quantum dot single-photon source operating at telecom wavelengths. The plug\&play device emits single-photon pulses at O-band wavelengths ($1321\,$nm) and is based on a directly fiber-pigtailed deterministically-fabricated quantum dot device integrated into a compact Stirling cryocooler. The Stirling is housed in a 19-inch rack module including all accessories required for stand-alone operation. Implemented in a simple QKD testbed emulating the BB84 protocol with polarization coding, we achieve an antibunching of $g^{(2)}(0) = 0.10\pm0.01$ and a raw key rate of up to $(4.72\pm0.13)\,$kHz using an external pump laser. In this setting, we further evaluate the performance of our source in terms of the quantum bit error ratios, secure key rates, and tolerable losses expected in full implementations of QKD also accounting for finite key size effects. Furthermore, we investigate optimal settings for a two-dimensional temporal acceptance window applied on receiver side, resulting in predicted tolerable losses up to $23.19\,$dB. Not least, we compare our results with previous proof-of-concept QKD experiments using quantum dot single-photon sources. Our study represents an important step forward in the development of fiber-based quantum-secured communication networks exploiting sub-Poissonian quantum light sources.
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