Non-static Quantum Bit Commitment

Details Non-static Quantum Bit Commitment Non-static Quantum Bit Commitment

2009-01-09

arxiv.org/abs/0901.1178v4

Physics

Quantum Physics

5 pages

Scientific paper

Quantum bit commitment has been known to be impossible by the independent proofs of Mayers, and Lo and Chau, under the assumption that the whole quantum states right before the unveiling phase are static to users. We here provide an unconditionally secure non-static quantum bit commitment protocol with a trusted third party, which is not directly involved in any communications between users and can be limited not to get any information of commitment without being detected by users. We also prove that our quantum bit commitment protocol is not secure without the help of the trusted third party. The proof is basically different from the Mayers-Lo-Chau's no-go theorem, because we do not assume the staticity of the finally shared quantum states between users.

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