Optical quantum communication theory

通信是现代社会的关键技术之一。随着我们越来越多地转向电子通信，信息交换的保密性和对消息来源的信任等问题也浮出水面。今天，我们的通信网络受到似乎非常强大的加密方法的保护。然而，它们依赖于必须随着时间的推移反复验证的假设。我们的研究旨在改变这一局面。量子力学提供了一些经典世界中未知的特征：一般来说，量子信号是不可能复制的。此外，任何访问量子消息内容的尝试通常都会改变消息，从而在系统中留下痕迹。由于这一性质，量子力学为我们的通信社会中的一些问题提供了解决方案，在那里所断言的性质可以得到严格的证明。无条件安全通信就是这样一个例子。我们的工作旨在将更多已知的抽象量子通信解决方案转化为可实际实现的解决方案，从而使其更接近商业应用。

Communication is one of the key technologies of modern society. As we turn more and more to electronic communication, questions such as confidentiality of the information exchange and trust in origin of messages come  to the foreground. Today our communication networks are protected by cryptographic methods that seem to be very powerful. However, they depend on assumptions that have to be checked again and again over time. Our research aims at changing this picture.Quantum mechanics offers some features that are unknown in the classical world: in general, it is not possible to copy quantum signals. Moreover, any attempt to access the content of a quantum message will in general change the message, thereby leaving traces in the system. Thanks to this property, quantum mechanics offers solutions to some problems of our communication society where the asserted properties can be rigorously proven. Unconditional secure communication is one such example.Our work aims at transforming more of the known abstract quantum communication solutions to solutions that can be practically implemented, thus bringing it closer to commercial applications.