People

Professor Hoi Fung Chau is a quantum information scientist working on various problems in quantum information and quantum cryptography.  His research is generally theoretical using rigorous mathematical proofs.  And occasionally, his study leads to very practical innovations.  One example is a recent patent on increasing the communication rate of satellite-to-ground classical and quantum communications that he has filed together with one of his former students.

Professor Chau's research interests include ways to increase the provably secure key rate in realistic quantum key distribution, security analysis of post quantum cryptography as well as fundamental limits on quantum information processing speed.

1.  "$\alpha_{>}(\epsilon) = \alpha_{<}(\epsilon)$ For The Margolus-Levitin Quantum Speed Limit Bound", H.F. Chau, Physical Review A, 108, 052202:1--7 (2023)
2.  "Reducing The Impact Of Adaptive Optics Lag On Optical And Quantum Communications Rates Of Rapidly Moving Sources", K.S. Chan, & H.F. Chau, AIP Advances, 13, 055201 (2023)
3.  "Quantum And Classical Data Transmission Through Completely Depolarizing Channels In A Superposition Of Cyclic Orders", G. Chiribella, M. Wilson, & H.F. Chau, Physical Review Letters, 127, 190502:1--6 (2021)
4.  "Tight Upper Bound Of The Maximum Speed Of Evolution Of A Quantum State", H.F. Chau, Physical Review A, 81, 062133:1--4 (2010)
5.  "Unconditionally Secure Key Distribution In Higher Dimensions By Depolarization", H.F. Chau, IEEE Transactions On Information Theory, 51, 1451--1468 (2005)
6.  "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):1—4 (2002)
7.  "Unconditional Security Of Quantum Key Distribution Over Arbitrarily Long Distances", H.-K. Lo, & H.F. Chau, Science, 283, 2050--2056 (1999)
8.  "Is Quantum Bit Commitment Really Possible?", H.-K. Lo, & H.F. Chau, Physical Review Letters, 78, 3410--3413 (1997).
9.  "Postglitch Relaxation Of The Vela Pulsar After Its First Eight Large Glitches: A Reevaluation With The Vortex Creep Model", M.A. Alpar, H.F. Chau, K.S. Cheng, & D. Pines, Astrophysical Journal, 409, 345--359 (1993)

1. General Research Fund (GRF) 2023/24 (PI): Quantum Speed Limit For Wasserstein And Related Distances And For Measurement Uncertainty (HKU Project Code: 17303323)