Free-Space Quantum Key Distribution with Single Photons from Defects in Hexagonal Boron Nitride
Free-Space Quantum Key Distribution with Single Photons from Defects in Hexagonal Boron Nitride
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DOI：
10.1002/qute.202200059
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发表时间：
2022-08-03
影响因子：
4.4
通讯作者：
Ates, Serkan
中科院分区：
文献类型：
--
作者：
Samaner, Caglar;Pacal, Serkan;Ates, Serkan
有效的单光子产生是量子技术中的若干实际应用（包括量子密码术）的重要要求。利用六方氮化硼（hBN）中的孤立缺陷产生的单光子实现了自由空间量子密钥分配（QKD）的概念验证。将该亮光源集成到基于B92协议的量子密钥分发系统中，在1MHz时钟速率下获得了238bps的密钥速率和8.95%的量子误码率。研究了探测光子的时间滤波对量子密钥分配参数性能的影响。相信这些结果将刺激对hBN以及其他基于2D的量子发射体中的光学活性缺陷及其在量子信息技术（包括实际QKD系统）中的应用的研究。
Efficient single photon generation is an important requirement for several practical applications in quantum technologies, including quantum cryptography. A proof-of-concept demonstration of free-space quantum key distribution (QKD) is presented with single photons generated from an isolated defect in hexagonal boron nitride (hBN). The bright source operating at room temperature is integrated into a QKD system based on B92 protocol and a sifted key rate of 238 bps with a quantum bit error rate of 8.95% are achieved at 1 MHz clock rate. The effect of temporal filtering of detected photons on the performance of QKD parameters is also studied. It is believed that these results will stimulate the research on optically active defects in hBN as well as other 2D-based quantum emitters and their applications within quantum information technologies including practical QKD systems.