Threshold quantum cryptograph based on Grover's algorithm

Details Threshold quantum cryptograph based on Grover's algorithm Threshold quantum cryptograph based on Grover's algorithm

2006-06-16

arxiv.org/abs/quant-ph/0606136v2

Physics

Quantum Physics

7 pages, 1 figures

Scientific paper

Grover's operator in the two-qubit case can transform a basis into its conjugated basis. A permutation operator can transform a state in the two conjugated bases into its orthogonal state. These properties are included in a threshold quantum protocol. The proposed threshold quantum protocol is secure based the proof that the legitimate participators can only eavesdrop 2 bits of 3 bits operation information on one two-qubit with error probability 3/8. We propose a scheme to detect the Trojan horse attack without destroying the legal qubit.

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