Hybrid Measurement Scheme for Quantum‑Enhanced Reception of QPSK

Fig. 6. Optimal displacement operator and performance analysis under different mean photon number. (a) Amplitude of the optimal displacement operator; (b) phase of the optimal displacement operator; (c) error probability of the optimal displacement operator

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Fig. 7. Optimal ratio and performance analysis for the partitional quantum measurement stage. (a) Optimal ratio; (b) error probability

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Fig. 8. Optimal ratio and performance analysis of hybrid measurement scheme. (a) Optimal ratio; (b) error probability

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Table 1. Decision strategy of the hybrid measurement scheme
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Table 1. Decision strategy of the hybrid measurement scheme
HD Short interval Second interval Result
Positive Off Off $|α_{0}〉$
Off On $|α_{1}〉$
On Off $|α_{0}〉$
On On $|α_{1}〉$
Negative Off Off $|α_{3}〉$
Off On $|α_{2}〉$
On Off $|α_{3}〉$
On On $|α_{2}〉$

Table 2. Parameters in the simulation experiment
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Table 2. Parameters in the simulation experiment
Parameter Symbol Value
Detection efficiency $η$ $66 %$
Visibility $ξ$ $99.6 %$
Transmittance $τ$ $99 %$
Dark count rate $ν_{d a r k}$ $1.5 \times 10^{- 3}$

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Chang Guo, Kezheng Dang, Tianyi Wu, Jungang Yang, Yang Ran, Zichao Zhou, Chen Dong. Hybrid Measurement Scheme for Quantum‑Enhanced Reception of QPSK[J]. Chinese Journal of Lasers, 2024, 51(14): 1412001

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