Why quantum bit commitment and quantum coin tossing are impossible ?

@inproceedings{Lo1996WhyQB,
  title={Why quantum bit commitment and quantum coin tossing are impossible ?},
  author={Hoi-Kwong Lo and Hoi Fung Chau},
  year={1996}
}
There had been well known claims of “provably unbreakable” quantum protocols for bit commitment and coin tossing. However, we, and independently Mayers, showed that all proposed quantum bit commitment (and coin tossing) schemes are, in principle, insecure because the sender, Alice, can always cheat successfully by using an EPR-type of attack and delaying her measurements. One might wonder if secure quantum bit commitment and coin tossing protocols exist at all. Here we prove that an EPR-type of… CONTINUE READING