Unconditionally secure quantum bit commitment: Revised.

최정운

Naya Nagy, Marius Nagy

Horace P. Yuen

Chi-Yee Cheung

It is generally believed that unconditionally secure quantum bit commitment (QBC) is proven impossible by a "no-go theorem". We point out that the theorem only establishes the existence of a cheating unitary transformation in any QBC scheme secure against the receiver, but this fact alone is not sufficient to rule out unconditionally secure QBC as a matter of principle, because there exists no proof that the cheating unitary transformation must be known to the cheater in all possible cases. In this work, we show how to circumvent the "no-go theorem" and prove that unconditionally secure QBC is in fact possible.

Arindam Mitra

It has been claimed that unconditionally secure quantum bit commitment is impossible. This claim has been widely accepted and is commonly referred to as the no-go theorem. The no-go theorem implicitly raises the question of whether quantum mechanics can be collectively verified with unconditional security against cheating. We demonstrate that by following an alternative quantum encoding scheme, unconditionally secure quantum bit commitment can, in fact, be achieved.

Ariel Danan, Lev Vaidman A