Preparation method of probabilistic long-range complex coefficient quantum state based on unknown parameter ghz channel
A technology with unknown parameters and quantum states, applied in the field of quantum communication
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[0053] Embodiment 1: A joint probabilistic state preparation method based on an unknown parameter GHZ channel, which uses probability to prepare complex coefficient quantum states as an example. Specific steps:
[0054] Step 1: Communication preparation stage. Alice 1 、Alice 2 is the joint sender of the communication, and Bob is the receiver of the communication. The sending and receiving parties share two identical GHZ states and the parameters are unknown (a|000>+b|111>). , 6, and use it as a quantum channel:
[0055]
[0056] Among them, Alice 1 Has particle 1, Alice 2 has particle 2, and Bob has particles 3, 4, 5, and 6. The quantum state to be prepared is
[0057] Step 2: remote state preparation process. First, rewrite the state of the communication system as:
[0058]
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