Quantum secret sharing (QSS) is one of the basic communication primitives in future quantum networks which addresses part of the basic cryptographic tasks of multiparty communication and computation. Nevertheless, it is a challenge to provide a practical QSS protocol with security against general attacks. A QSS protocol that balances security and practicality is still lacking. Here, we propose a QSS protocol with simple phase encoding of coherent states among three parties. Removing the requirement of impractical entangled resources and the need for phase randomization, our protocol can be implemented with accessible technology. We provide the finite-key analysis against coherent attacks and implement a proof-of-principle experiment to demonstrate our scheme's feasibility. Our scheme achieves a key rate of 85.3 bps under a 35 dB channel loss. Combined with security against general attacks and accessible technology, our protocol is a promising candidate for practical multiparty quantum communication networks.
翻译:量子秘密共享(QSS)是未来量子网络中的一种基本通信原语,涵盖了多方通信和计算的基本加密任务。然而,实现安全实用的QSS协议仍然是一个挑战,因为对于一般攻击,提供既安全又实用的QSS协议依然是一个挑战。在这里,我们提出了一种QSS协议,它利用三方之间量子相干态简单的相位编码。我们的协议没有不切实际的纠缠资源需求和相位随机化要求,可以利用可用技术进行实现。我们提供了针对相干攻击的有限密钥分析,并进行了实验验证以证明我们的方案的可行性。我们的方案在35 dB的信道损失下实现了85.3 bps的密钥速率。结合安全性和可用技术,我们的协议是实用的多方量子通信网络的一个有前途的选择。