ITR/SI: Quantum Communication and Cryptography: Protocols and Systems

EIA-0113440Vwani Roychowdhury加州大学洛杉矶分校标题：量子通信和密码学：协议和系统功能正常的量子计算机将使用于在互联网上进行安全通信的所有公钥密码协议(例如，RSA、Diffie-Hellman)变得不安全；相反，QKD可以拯救互联网并实现安全的公共通信。类似地，如果各方可以预先共享EPR对，则超密集编码可能会使信道的经典容量翻倍。该项目旨在对量子信息处理中的问题进行理论研究，包括(1)纠缠提纯和蒸馏算法，(2)各种量子通道的容量结果，(3)基于局域量子操作和经典通信(LOCC)的有效纠缠操纵和纯态管理，(4)使用实际系统的量子密钥分发，以及(5)新的信息安全的量子密码协议，这些协议只有量子系统才能实现，但使用经典密码协议是未知的。

EIA-0113440Vwani RoychowdhuryUniversity of California at Los AngeleTitle: Quantum Communication and Cryptography: Protocols and SystemsA functional quantum computer would render all public-key cryptographic protocols (e.g., RSA, Diffie-Hellman), used for secure communication over the Internet, insecure; conversely, QKD could save the Internet and enable secure public communication. Similarly, super-dense coding can potentially double the classical capacity of a channel, if the parties could share EPR pairs in advance. This project is aimed at a theoretical study of issues in quantum informatin processing, including (1) algorithms for entanglement purification and distillation, (2) Capacity results for various quantum channels, (3) efficient entanglement manipulation and pure state management via local quantum operations and classical communication (LOCC), (4) quantum key distribution using practical systems, and (5) novel informationally-secure quantum cryptographic protocols that only quantum systems might enable, but are not known to exist using classical cryptographic protocols.