Qubit-string-based bit commitment protocols with physical security

Details Qubit-string-based bit commitment protocols with physical security Qubit-string-based bit commitment protocols with physical security

2010-11-23

arxiv.org/abs/1011.5099v2

Physics

Quantum Physics

21 pages, 0 figures

Scientific paper

Several kinds of qubit-string-based(QS-based) bit commitment protocols have been presented in this paper. We show that for QS-based protocols the size of unitary matrix U_A suggested by no-go theorem is so large that the number of entries of U_A is about (2^100)*(2^100) as the length of n-qubit string used in our protocols is 100. This number is greater than the number of atoms of the earth, so the matrix U_A can never be get by human beings actually. We suggest this kind of security the 'physical security'. Then we arrive at a conclusion that the QS-based bit commitment protocol can realize information theoretically secure concealing and physically secure binding simultaneously. Finally, a practical QS-based scheme against channel loss and error is presented.

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