arXiv 0804.35312008-04-22quant-ph

Practically secure quantum bit commitment based on quantum seals

Guang Ping He, Z. D. Wang

备注：: 6 pages, 1 figure

英文摘要：

The relationship between the quantum bit commitment (QBC) and quantum seal (QS) is studied. It is elaborated that QBC and QS are not equivalent, but QS protocols satisfying a stronger unconditional security requirement can lead to an unconditionally secure QBC. In this sense, QS is strictly stronger than QBC in security requirements. Based on an earlier proposal on sealing a single bit, a feasible QBC protocol is also put forward, which is secure in practice even if the cheater has a strong quantum computational power.

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