Quantum key distribution system and method
A quantum key distribution and photonic technology, applied in the field of communication, can solve the problems of reducing the coding rate of quantum key distribution system, low signal spectrum utilization rate, etc., to improve the coding rate, high spectrum utilization rate, and ensure security. Effect
Active Publication Date: 2022-08-05
武汉船舶通信研究所
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However, the BB84 protocol requires two sets of orthogonal bases to transmit two-bit quantum signals to ensure the quantum randomness of the signal. Through two sets of orthogonal bases to transmit signals, each particle can only represent bit 0 or 1, resulting in relatively low frequency spectrum utilization of the signal. Low, which reduces the coding rate of the quantum key distribution system
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[0046] In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.
[0047] figure 1 It is a schematic structural diagram of a quantum key distribution system provided by an embodiment of the present disclosure. see figure 1 , the quantum key distribution system includes: a single-photon source 101, a first phase modulator 102, a 90-degree phase shifter 103, a second phase modulator 104, a 180-degree mixer 105, and two single-photon detectors 106 and processor 107.
[0048] Wherein, the single photon source 101 is used to generate a single photon signal;
[0049] A first phase modulator 102, connected to the single-photon source 101, is used for phase-modulating the single-photon signal based on a first random number sequence, and the first phase modulator adopts two different first base pairs The single...
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The present disclosure provides a quantum key distribution system and method. The system includes: a first phase modulator for performing phase modulation on a single-photon signal based on a first random number sequence; a 90-degree phase shifter for performing a 90-degree phase shift on the output signal of the first phase modulator, The first channel of single-photon modulation signal is obtained; the second phase modulator is used to perform phase modulation on the single-photon signal based on the second random number sequence to obtain the second channel of single-photon modulation signal; the 180-degree mixer is used to One channel of single-photon modulation signal and the second channel of single-photon modulation signal are mixed by 180 degrees to obtain two channels of mixed-frequency coherent signals; two single-photon detectors are used to detect the two channels of mixed-frequency coherent signals respectively to obtain detection result; a processor for determining a communication key based on the detection result, the basis selected by the first phase modulator at different times, and the basis selected by the second phase modulator at different times.
Description
technical field [0001] The present disclosure relates to the field of communication technologies, and in particular, to a quantum key distribution system and method. Background technique [0002] Quantum key distribution (QKD) uses microscopic particles as a carrier for key distribution. The security of the key is guaranteed by basic physical principles. In theory, both parties use quantum key distribution combined with "one-time pad" encryption. In this way, users who are separated from two places can securely exchange keys and realize secure communication. [0003] As the first quantum key distribution protocol in the world, the quantum BB84 protocol has been widely used and studied in the field of quantum key distribution. However, the BB84 protocol requires two sets of orthogonal bases to transmit two-bit quantum signals to ensure the quantum randomness of the signals. Through the two sets of orthogonal bases to transmit signals, each particle can only represent a bit 0...
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IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 文柯周金荣费礼陈思井吴保中李亚平肖云
Owner 武汉船舶通信研究所