论文标题
连续可变量子通信的实验性被动状态准备
Experimental passive state preparation for continuous variable quantum communications
论文作者
论文摘要
在高斯调制的相干状态量子键分布（QKD）协议中，发件人首先生成高斯分布式随机数，然后通过执行振幅和相位调制来积极地在弱激光脉冲上编码它们。最近，通过探索热源的固有场波动，提出了同等的被动QKD方案[B. Qi，P。G. Evans和W. P. Grice，物理。 Rev. A 97，012317（2018）]。由于不需要主动调制，因此该被动QKD方案特别吸引了CHIP级实施。在本文中，我们使用在连续波模式下运行的现成的自发发射源对被动编码的QKD方案进行了实验研究。我们的结果表明，通过应用光学衰减和安全钥匙可以在地铁区域距离上产生被动状态制备方案引入的多余噪声。
In the Gaussian-modulated coherent state quantum key distribution (QKD) protocol, the sender first generates Gaussian distributed random numbers and then encodes them on weak laser pulses actively by performing amplitude and phase modulations. Recently, an equivalent passive QKD scheme was proposed by exploring the intrinsic field fluctuations of a thermal source [B. Qi, P. G. Evans, and W. P. Grice, Phys. Rev. A 97, 012317 (2018)]. This passive QKD scheme is especially appealing for chip-scale implementation since no active modulations are required. In this paper, we conduct an experimental study of the passively encoded QKD scheme using an off-the-shelf amplified spontaneous emission source operated in continuous-wave mode. Our results show that the excess noise introduced by the passive state preparation scheme can be effectively suppressed by applying optical attenuation and secure key could be generated over metro-area distances.
