Quantum Information Group

People

Research Activities

Our research works focus on quantum information processing. On the application side, we work on the proofs of unconditional security of various quantum cryptographic protocols and primitives. And on the theoretical side, we study how ideas used in quantum information processing and quantum information theory can be used to tackle fundamental problems in quantum mechanics. 

Some Representative Publications

1. "Metrics on Unitary Matrices and their Application to Quantifying the Degree of Non-commutativity between Unitary Matrices", H.F. Chau, Quantum Information and Computation, 11, 721-740 (2011).
2. "Tight upper bound of the maximum speed of evolution of a quantum state", H. F. Chau, Physical Review A, 81, 062133 (2010).
3. "Unconditional secure key distribution in higher dimensions by depolarization", H. F. Chau, IEEE Transactions On Information Theory, 51, 1451 (2005).
4. "Practical scheme to share a secret key through a quantum channel with a 27.6% bit error rate", H. F. Chau, Physical Review A, 66, 060302(R) (2002).
5. "Unconditionally security of quantum key distribution over arbitrarily long distances", H.-K. Lo and H. F. Chau, Science, 283, 2050 (1999).
6.  "Is quantum bit commitment really possible?", H.-K. Lo and H. F. Chau, Physical Review Letters, 78, 3410 (1997).