Is cheat sensitive quantum bit commitment really possible
Satoshi Ishizaka · arXiv (Cornell University) · 2007
We show that, if a quantum coin flip is combined with another quantum protocol, quantum bit escrow, as a subroutine to realize a cheat sensitive quantum bit commitment, a nontrivial cheating strategy frequently becomes possible. This cheating strategy, where a dishonest party takes advantage of the classical and/or quantum information transmitted in the quantum coin flip, is so powerful that the dishonest party recovers even maximal quantum entanglement from the quantum state once the dishonest party collapsed, whenever the dishonest party loses the coin flip.