Unconditionally Secure Quantum Bit Commitment Is Possible

Details Unconditionally Secure Quantum Bit Commitment Is Possible Unconditionally Secure Quantum Bit Commitment Is Possible

2000-06-23

arxiv.org/abs/quant-ph/0006109v7

Physics

Quantum Physics

41 pages; a long definitive version

Scientific paper

Bit commitment involves the submission of evidence from one party to another so that the evidence can be used to confirm a later revealed bit value by the first party, while the second party cannot determine the bit value from the evidence alone. It is widely believed that secure quantum bit commitment is impossible due to quantum entanglement cheating, which is codified in a general impossibility theorem. In this paper, the scope of this general impossibility proof is extended and analyzed, and gaps are found. Three specific protocols are described for which the entanglement cheating as given in the impossibility proof fails to work. One of these protocols, QBC2, is proved to be unconditionally secure.

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