Prof. Banghong Guo Profile

Prof. Banghong Guo

at South China Normal University

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Publications (5)

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Proceedings Article | 12 March 2021 Paper

Measurement-device-independent quantum key distribution based on GHZ-entangled-state

Ximing Hua, Min Hu, Banghong Guo

Proceedings Volume 11763, 117637K (2021) https://doi.org/10.1117/12.2587453

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Quantum key distribution is the core technology of quantum communication. In 2012, the Measurement-Device-independent quantum key distribution protocol proposed by Lo et al., referred to as MDI-QKD protocol, can effectively resist detector attacks from eavesdroppers. However, the traditional MDI-QKD only supports two parties, which can no longer meet the actual needs in the era of rapid development of communication technology. Therefore, multi-party quantum key distribution has become one of the current hot spots. This paper proposes a multi-user measurement device-independent QKD method based on the GHZ entanglement state. The GHZ entanglement source is used as the quantum relay, which solves the multi-party communication and greatly improves the safe communication distance.

Proceedings Article | 12 March 2021 Paper

Clock synchronization using dichotomy based on polarization-entangled GHZ states

Gang Liu, Min Hu, Banghong Guo

Proceedings Volume 11763, 117636L (2021) https://doi.org/10.1117/12.2587369

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We propose a clock synchronization scheme using dichotomy based on polarization-entangled GHZ states. This scheme includes the first synchronization party (Alice), the second synchronization party (Bob) and the transmitter (Charlie). Alice and Bob are connected through a classical channel, Charlie and Alice are connected through a quantum channel, and Charlie and Bob are connected through a quantum channel and a classical channel. Charlie prepares a threephoton polarization entangled GHZ state and sends three photons to Alice, Bob and his own detector simultaneously. Alice, Bob, and Charlie then measure the polarization of the three photons. According to the properties of the GHZ state, Charlie can infer which of Alice and Bob performed the measurement first by comparing the measurement results with Bob, so as to adjust the optical delay line between himself and Alice. The GHZ state entanglement effect used in this scheme is a nonlocalized effect, which is "instantly" and can reach a higher accuracy than classical clock synchronization. The transmission of the optical signal is one-way, there is no requirement for the transmission speed of the signal in different directions and thus reduce the influence of the fiber during the transmission.

Proceedings Article | 12 March 2021 Paper

Implementation of post-processing for phase-polarization combined modulation QKD system

Fan Yang, Min Hu, Banghong Guo

Proceedings Volume 11763, 117634K (2021) https://doi.org/10.1117/12.2587016

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According to the characteristics of the combined modulation Quantum Key Distribution (QKD) system, a postprocessing method for phase-polarization combined modulation is designed and implemented, which is consist of sifting, parameter estimation, error reconciliation and privacy amplification. In this paper, we focuses on the research of error reconciliation. Firstly, the error reconciliation algorithm is given. On account of it, the hardware implementation scheme is designed and simulated on the Field Programmable Gate Array (FPGA) hardware platform. The error reconciliation algorithm mentioned above is based on Low Density Parity Check Code (LDPC) in IEEE802.16e standard. A fast iteration method is used in encoding scheme, on the basis of the check-matrix with sparsity as well as quasi-dual-diagonal structure, it reduces the quantity of logic resource and complexity of encoding and improves the encoding speed relatively. The encoder is implemented in FPGA with a 576-bit code length and 1/2 code rate. From the two aspects of functional and performance test, the system performance is higher than other implementations.

Proceedings Article | 12 March 2021 Paper

Measurement-device-independent quantum key distribution based on W state

Min Hu, Banghon Guo

Proceedings Volume 11763, 117638H (2021) https://doi.org/10.1117/12.2587594

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W state is a kind of multiparticle entangled state, which plays an important role in quantum information processing. Compared with the multi particle entangled GHZ state, an important feature of W state is that when one of the particles is lost or projected to the designated quantum state, the remaining particles are still entangled. In this paper, we propose a novel MDI-QKD based on W state.

Proceedings Article | 12 March 2021 Paper

Classical-quantum signals simultaneous transmission sharing a same fiber based on mode division multiplexing

Cong Chen, Min Hu, Banghong Guo

Proceedings Volume 11763, 117637W (2021) https://doi.org/10.1117/12.2587491

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Quantum cryptography uses the basic principles of quantum physics to ensure the security of information transmission. In theory, it has unconditional security and can provide new technical guarantees for information security in various fields of society. In order to save the cost of deploying the QKD network, the QKD network can be combined with the existing classical communication network, so that the quantum signal and the classical signal can be transmitted through the same fiber. However, there are still many key technical problems in the fusion network of quantum communication and classical communication. This paper proposes a technique of classical-quantum signals simultaneous transmission sharing a same fiber based on mode division multiplexing. This scheme improves the problem that a large mode gain difference between different modes caused by EDFA and leads to a decrease in the transmission capacity of the system in the existing long distance mode division multiplexing transmission system.

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