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Insecurity of Quantum Secure Computations
Hoi-Kwong Lo
It had been widely claimed that quantum mechanics can protect private information during public decision in for example the so-called two-party secure computation. If this were the…
How much does it cost to teleport?
H. F. Chau, H. -K. Lo
We show that the entropy of entanglement of a state characterizes its ability to teleport. In particular, in order to teleport faithfully an unknown quantum -state, the two user…
Why quantum bit commitment and ideal quantum coin tossing are impossible
Hoi-Kwong Lo, H. F. Chau
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…
Is Quantum Bit Commitment Really Possible?
Hoi-Kwong Lo, H. F. Chau
We show that all proposed quantum bit commitment schemes are insecure because the sender, Alice, can almost always cheat successfully by using an Einstein-Podolsky-Rosen type of at…