中文摘要：

在量子密码协议中，比较典型的量子密钥分配协议（QKD）和量子安全直接通信（QSDC）协议都只能实现信息的单向传输。而在量子对话协议中，通信双方Alice和Bob只需要一次通信便可以同时交换秘密信息。目前流行的量子对话协议都是基于离散变量实现，缺点是受到现有技术水平的限制，实用性不强，而连续变量的量子协议可以解决这个问题。基于连续变量提出了一个新的量子对话协议，采用信息论的方法对协议进行分析，结果表明该协议不仅安全，而且信道容量高于离散变量量子对话协议。

英文摘要：

In quantum cryptography, it is commonly established that quantum key distribution and quanturn secure direct communication work in a single direction, namely one direction communication schemes However, quantum dialog protocol can enable two legal users exchange messages simultaneously, namely two direction communication. Most existed proposals of quantum dialog protocol are based on discrete variables which are much more difficult to implement with today＇s technology, thus they are less practical than its counterpart. Based on squeezed states, a new quantum dialog scheme is proposed, information-theoretical analysis is then followed and it shows that our scheme is not only secure, but also has larger channel capacity than that of its counterpart.