597 citations · 3k across the 37 of their papers we have counts for
4 papers · 2 filters
Structural Characterization And Condition For Measurement Statistics Preservation Of A Unital Quantum Operation
Kai-Yan Lee, Chi-Hang Fred Fung, H. F. Chau
We investigate the necessary and sufficient condition for a convex cone of positive semidefinite operators to be fixed by a unital quantum operation acting on finite-dimensiona…
Quantum key distribution with delayed privacy amplification and its application to security proof of a two-way deterministic protocol
Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau +1
Privacy amplification (PA) is an essential post-processing step in quantum key distribution (QKD) for removing any information an eavesdropper may have on the final secret key. In…
Phase encoding schemes for measurement device independent quantum key distribution and basis-dependent flaw
Kiyoshi Tamaki, Hoi-Kwong Lo, Chi-Hang Fred Fung +1
In this paper, we study the unconditional security of the so-called measurement device independent quantum key distribution (MDIQKD) with the basis-dependent flaw in the context of…
Unconditional security proof of a deterministic quantum key distribution with a two-way quantum channel
Hua Lu, Chi-Hang Fred Fung, Xiongfeng Ma +1
In a deterministic quantum key distribution (DQKD) protocol with a two-way quantum channel, Bob sends a qubit to Alice who then encodes a key bit onto the qubit and sends it back t…