Security in a Quantum World

几千年来，编码者和解码者一直在争夺霸主地位。随着互联网的出现，加密的重要性与日俱增。与传统密码学不同，量子密码学基于物理定律提供无条件的安全性。这项研究计划解决了量子密码学中一系列尚未解决的重要问题。它包括理论研究、模拟研究和实验研究。 在理论方面，我们计划研究量子关联之间的基本问题，即纠缠和量子秘密共享。在模拟方面，我们将研究实际量子密码系统的性能。在实验方面，我们计划设计和建造一个使用连续变量的高速量子密码网络，从而实现与现有光纤网络的量子通信。作为衍生技术，我们将构建一个健壮、低成本、高速的量子随机数发生器，它在密码学、模拟和网络游戏中有广泛的应用。 我们计划的一个特别优势是我们在量子黑客和反措施方面的专业知识。事实上，我们新研究计划的一个核心是研究一种完全类型的量子密码协议的优缺点，该协议基于“测量设备独立”的量子密钥分配。在这里，我们的目标是构建具有无与伦比的安全性和性能的新型量子密钥分发系统。我们的工作不仅有助于基础研究，还可能孵化加拿大第一个商用量子密钥分发系统。

For thousands of years, code-makers and code-breakers have been competing for supremacy. With the advent of the internet, the importance of encryption is growing. Unlike conventional cryptography, quantum cryptography offers unconditional security based on the laws of physics. This research program addresses a wide range of important unresolved problems in quantum cryptography. It involves research in theory, simulations and experiments. On the theory side, we plan to study the fundamental question of the connection between quantum correlations called entanglement and quantum secret sharing. On the simulation side, we will study the performance of practical quantum cryptographic systems. On the experimental side, we plan to design and build a high-speed quantum cryptographic network using continuous variables, thus enabling quantum communication with existing fibre networks. As a spin-off technology, we will build a robust, low-cost, high-speed quantum random number generator, which has widespread applications in cryptography, simulations and on-line gaming. A particular strength of our program is our expertise in quantum hacking and counter-measures against it. In fact, a centrepiece of our new research program is the study of the strengths and weaknesses of an entirely type of quantum cryptographic protocols based on "measurement-device-independent" quantum key distribution. Here, we aim at building new type of quantum key distribution systems with unmatched security and performance. Our work not only contributes to fundamental research, but also may incubate the first Canadian commercial quantum key distribution systems.