PDF(Pubmed)
Abstract：
Secret key exchange relies on the creation of correlated signals, serving as the raw resource for secure communication. Thermal states exhibit Hanbury Brown and Twiss correlations, which offer a promising avenue for generating such signals. In this paper, we present an experimental implementation of a central broadcast thermal-state quantum key distribution (QKD) protocol in the microwave region. Our objective is to showcase a straightforward method of QKD utilizing readily available broadcasting equipment. Unlike conventional approaches to thermal-state QKD, we leverage displaced thermal states. These states enable us to share the output of a thermal source among Alice, Bob, and Eve via both waveguide channels and free space. Through measurement and conversion into bit strings, our protocol produces key-ready bit strings without the need for specialized equipment. By harnessing the inherent noise in thermal broadcasts, our setup facilitates the recovery of distinct bit strings by all parties involved.
摘要：
秘密密钥交换依赖于相关信号的创建，作为安全通信的原始资源。热态表现出HanburyBrown和Twiss的相关性，这为产生这种信号提供了一个有希望的途径。在本文中,我们介绍了微波区域中中央广播热态量子密钥分配（QKD）协议的实验实现。我们的目标是展示一种简单的QKD方法，利用现成的广播设备。与传统的热态QKD方法不同，我们利用位移的热状态。这些状态使我们能够在爱丽丝之间共享热源的输出，鲍勃,和夏娃通过两个波导通道和自由空间。通过测量并转换为位串，我们的协议产生密钥就绪位串，而不需要专门的设备。通过利用热广播中的固有噪声，我们的设置有助于所有相关方恢复不同的位串。
