Quantum key agreement protocol based on GHZ state
A technology of quantum key negotiation and protocol, applied in the field of quantum communication, which can solve the problems of inability to resist Trojan horse attacks and delayed photon Trojan horse attacks, and low qubit efficiency.
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[0027] 1. Preliminary knowledge
[0028] First, introduce four unitary transformations U 00 ,U 01 ,U 10 and U 11 , namely U 00 =I=|0>01 =X=|0>10 =Z=|0>11 =iY=|0>,|1>} form the Z base, {|+>,|->} form the X base, where, | + > = 1 / 2 ( | 0 > + | 1 > ) , | - > = 1 / 2 ( | 0 > + | 1 > ) .
[0029] The four Bell states are defined as follows:
[0030] | φ + > = 1 / 2 ( | 00 > ...
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