Through existing theories,it has been proven that the superposition state of the new macroscopic Schrödinger"cat state",that is,the concatenated Greenberger-Horne-Zeilinger(C-GHZ)state of logical qubits is better than the ordinary GHZ state in an actual noisy environment.The C-GHZ state has strong robustness and stronger anti-noise ability.Therefore,it is more feasible to realize long-distance quantum communication and large-scale quantum networks based on entangled C-GHZ states of logical qubits.Due to previous theoretical ver-ification,a theoretical solution is proposed that can approximately completely distinguish logical Bell states using only simple linear optical devices and a non-destructive measurement device based on electronic systems,P-gate,which improves the utilization of quantum resources and reduces phase noise.In the scheme the operability of the experiment is further improved.This scheme can also distinguish arbitrary C-GHZ states with N logical qubits.
关键词
量子通信/量子纠缠/贝尔态分析/C-GHZ态
Key words
quantum communication/quantum entanglement/Bell state analysis/C-GHZ state
维普
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