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Asynchronously matched measurement equipment-independent quantum key distribution method and system

A technology of quantum key distribution and measurement equipment, which is applied in the field of asynchronously matched measurement equipment-independent quantum key distribution, which can solve the problems of inability to break the limit of linear coding rate, high system bit error rate, short transmission distance, etc., and achieve saving The effect of experiment cost, high efficiency, and reduced experiment requirements

Active Publication Date: 2021-08-31
NANJING UNIV
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  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to provide an asynchronous matching measurement equipment-independent quantum key distribution method and system, which solves the problem that the current measurement equipment-independent quantum key distribution system cannot break the limit of the linear coding rate, resulting in a low coding rate , the system bit error rate is high, and the transmission distance is short

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  • Asynchronously matched measurement equipment-independent quantum key distribution method and system
  • Asynchronously matched measurement equipment-independent quantum key distribution method and system
  • Asynchronously matched measurement equipment-independent quantum key distribution method and system

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Embodiment 1

[0063] Such as figure 2 As shown, this embodiment exemplarily provides an implementation manner of the asynchronous matching measurement device-independent quantum key distribution system described in the present invention.

[0064]The system of the present invention includes a first sending end, a second sending end and a measuring end, and both the first sending end and the second sending end include a first slave laser, a first intensity modulator, a first phase modulator and a first The attenuator is used to realize the functions of the pulse laser preparation module, the light intensity modulation module and the phase modulation module. The laser phase-locked-frequency-locked module includes an optical phase-locked loop, a first master laser and a second master laser, and the optical phase-locked loop is connected to the first master laser and the second master laser respectively; The pulsed laser prepared at the terminal is used for frequency and phase locking; this em...

Embodiment 2

[0103] Such as Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the pulsed laser light in this quantum key distribution system is only prepared as a quantum signal light pulse, and there is no need to measure the channel phase drift through a strong reference light.

[0104] The transmission distance of this embodiment is not greater than 490 km. When the transmission distance is not very far, the response rate is very large in a short time interval, and there are many quantum signal light response events. At the same time, the channel phase drift at two moments in a short time interval is small, The theoretical value of is close to 0, so no strong reference light is needed to measure the channel phase drift. In this case, referring to the quantum key distribution method in Embodiment 1, in this embodiment, in the post-matching stage, the result of a successful response can be randomly selected within a shorter time interval (for example, 5...

Embodiment 3

[0108] Such as Figure 6 As shown, the difference between this embodiment and Embodiment 2 is that the quantum key distribution system does not need a laser phase-locked-frequency-locked module.

[0109] When the transmission distance is not more than 370 km, the response rate is very large in a shorter time interval (such as 0.5μs), and there are many quantum signal photoresponse events. Referring to the quantum key distribution method in Embodiment 1, in this embodiment, the post-matching stage can be changed to randomly select the results of successful responses within a shorter time interval (for example, 0.5 μs) for matching.

[0110] It should be noted that within 0.5 μs, not only the channel phase drift is a negligible amount, but also the global phase difference caused by the laser frequency difference is also a negligible small amount. At this time, it is only necessary to calibrate the wavelength every tens of minutes, and the optical phase-locked loop or injection ...

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Abstract

The invention discloses an asynchronously matched measurement equipment-independent quantum key distribution method and system. The key limitation is broken through by using a post-matching method to realize time-phase coded two-photon Bell state measurement, and compared with the existing measurement equipment-independent quantum key distribution, the method provided by the invention can provide a higher security code rate, achieves farther transmission distance; meanwhile, under the condition that the transmission distance is not greater than 490 km, the method can select a short time interval for random matching, so that phase drift caused by channel transmission does not need to be calibrated; under the condition that the transmission distance is not greater than 370 km, rapid active phase locking and frequency locking of the laser are not needed, the experiment requirements are reduced, the safety and the practicability are greatly improved, and the experiment cost is saved.

Description

technical field [0001] The invention relates to the technical field of quantum key distribution, in particular to an asynchronous matching measurement device-independent quantum key distribution method and system. Background technique [0002] Quantum key distribution is the closest practical research direction in the field of quantum information. Due to the continuous development of computer performance, traditional ciphers, which rely on computational complexity, are being challenged in terms of security. The continuous cracking of the RSA algorithm in recent years just illustrates this point. In contrast, quantum key distribution technology with unconditional security has broad application prospects. [0003] In 2012, Lo et al. of the University of Toronto proposed a measurement device-independent quantum key distribution protocol (MDI-QKD), which uses two-photon interference to avoid all security vulnerabilities at the detection end, and has higher security and practica...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/70H04B10/516H04B10/54H04B10/556
CPCH04L9/0858H04L9/0855H04B10/70H04B10/5161H04B10/541H04B10/5561
Inventor 尹华磊陆玉硕谢元梅陈增兵
Owner NANJING UNIV
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