セキュア量子情報通信の基礎研究

该研究计划的主要研究内容是开发具有实际意义的量子保密通信新协议。我们引入了非对称量子对话(AQD)协议的概念，该协议为Alice和Bob提供不同数量的通信功率。所提出的方案提供了一种体系结构，其中在Alice和Bob之间共享的纠缠态和编码方案取决于他们想要彼此交换的经典信息量。半量子协议被提出用于密钥协商、受控确定性安全通信和对话，具有最优/最小非经典资源，并具有潜在的应用。具体地说，这些方案比现有的全量子协议需要更少的量子资源，因为在半量子密码学中，其中一个用户是经典的。这项研究已经确定，几乎所有可以使用全量子协议执行的安全通信和计算任务也可以以半量子方式执行。提出了量子会议(QC)的概念。QC被定义为一种多方安全通信任务，允许每一方使用量子资源以安全的方式将其消息同时传递给所有其他方。结果表明，所提出的协议可以利用大量的纠缠态和算符群来实现。

The main study of the research plan was to develop the new protocols of secure quantum communication, which have practical significance.1. We introduced a notion of asymmetric quantum dialogue (AQD) protocol, which provides the different amount of communication powers to Alice and Bob. The proposed scheme, offers an architecture, where the entangled state and the encoding scheme to be shared between Alice and Bob depends on the amount of classical information they want to exchange with each other.2. Semi-quantum protocols are proposed for key agreement, controlled deterministic securecommunication and dialogue, with optimal/minimal nonclassical resources, and with their potential applications. Specifically, these schemes show less quantum resources are required than the existing fully quantum protocols because in semi-quantum cryptography, one of the users is classical. This study has established that almost every secure communication and computation tasks that can be performed using fully quantum protocols can also be performed in semi-quantum manner.3. A notion of quantum conference (QC) is introduced. QC is defined as a multiparty secure communication task that allows each party to communicate their messages simultaneously to all other parties in a secure manner using quantum resources. It is shown that the proposed protocols can be realized using a large number of entangled states and group of operators.