论文标题
基于上下文的量子会议
Contextuality based quantum conferencing
论文作者
论文摘要
多方系统的非局部性不平等充当适当维度的单个Qudit系统的上下文不平等。在本文中，我们提出了将基于非局部性的量子会议协议（QCP）适应基于上下文的QCP的程序。与基于非局部性的协议不同，所提出的协议不涉及非本地状态。这些协议也可以在一系列嘈杂的渠道中实现，而没有任何关键生成率。为了说明该过程，我们根据Mermin的上下文不平等提出了QCP。作为一个重大改进，我们提出了一个基于CHSH上下文不平等的QCP，仅涉及四维状态，而与共享密钥的各方人数无关。后者的关键发电率是前者的两倍。尽管这些QCP允许在基于非局部性的QCP中进行窃听攻击，但可以证明这一攻击的出路。最后，我们显示了具有轨道角动量（OAM）状态实验实施这些方案的可行性。
Nonlocality inequalities for multi-party systems act as contextuality inequalities for single qudit systems of suitable dimensions. In this paper, we propose the procedure for adaptation of nonlocality-based quantum conferencing protocols (QCPs) to contextuality-based QCPs. Unlike the nonlocality-based protocols, the proposed protocols do not involve nonlocal states. These protocols can also be implemented in a class of noisy channels without any compromise in the key generation rate. As an illustration of the procedure, we present a QCP based on Mermin's contextuality inequality. As a significant improvement, we propose a QCP based on CHSH contextuality inequality involving only four-dimensional states irrespective of the number of parties sharing the key. The key generation rate of the latter is twice that of the former. Although these QCPs allow for an eavesdropping attack which has no analog in nonlocality-based QCPs, a way out of this attack is demonstrated. Finally, we show the feasibility of experimental implementation of these protocols with orbital angular momentum (OAM) states.
