Author Affiliations
1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China2CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China3State Key Laboratory of Cryptology, Beijing 100878, Chinashow less
Fig. 1. Schematic diagram of the nonstandalone MDI protocol. PM, phase modulator; Laser, pulsed weak-coherent source; BS, beam splitter; SPD, single-photon detector.
Fig. 2. Experimental setup for the nonstandalone MDI-QKD system. Alice and Bob can implement phase-encoding MDI-QKD and generate secure key with Charlie via BB84. Laser, frequency-locked lasers; IM1, intensity modulator as pulse generator; IM2, intensity modulator as decoy state generator; BS, beam splitter; PM, phase modulator; PS, phase shifter; FM, Faraday mirror; EVOA, electronic variable optical attenuator; EPC, electronic polarization controller; Circ, circulator; SPD, single-photon detector. For Alice, Bob, and Charlie, the combination of one BS, one phase controller, and two FMs constitutes their own AFMI; the other PM is used for phase randomization.
Fig. 3. Virtual network topology and link rates of our system.
Fig. 4. Schematic diagram of the nonstandalone MDI protocol with checkpoints.
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Table 1. Code Table in MDI Protocol
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Table 2. Code Table in BB84 Protocol
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| | 2.69% | | 26.08% | | | 4.75% | | 36.26% | | | 51.02% | | 50.10% | | | 5.02% | | 35.86% | | | 3.66% | | 26.16% | | | 47.26% | | 50.46% | | | 50.19% | | 50.40% | | | 51.88% | | 50.09% |
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Table 3. Experimental Gains and Quantum Bit Error Rates of Our MDI-QKD System
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| | 0.39% | | 0.28% | | | 0.38% | | 0.29% | | | 2.66% | | 1.82% | | | | | | | | 0.38% | | 0.34% | | | 0.50% | | 0.48% | | | 1.89% | | 2.09% |
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Table 4. Experimental Gains and Quantum Bit Error Rates of Our BB84 QKD Systems