Reciprocating Gauss modulated continuous variable quantum key distribution method and device

A technology of quantum key distribution and Gaussian modulation, applied in the field of round-trip Gaussian modulation continuous variable quantum key distribution, can solve problems such as non-transmission, and achieve the effects of avoiding transmission, improving long-term stability, and avoiding system performance degradation.

Inactive Publication Date: 2017-12-08
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of existing schemes that do not transmit local oscillator light, the purpose of the present invention is to provide a r

Method used

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  • Reciprocating Gauss modulated continuous variable quantum key distribution method and device
  • Reciprocating Gauss modulated continuous variable quantum key distribution method and device
  • Reciprocating Gauss modulated continuous variable quantum key distribution method and device

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Embodiment 1

[0036] see figure 1 , the present embodiment provides a round-trip Gaussian modulation continuous variable quantum key distribution method, comprising the following steps:

[0037] Step 1, pulse source generation: the sending end of the continuous variable quantum key distribution system generates a pulse source;

[0038] Step 2. Separation of local oscillator light and signal light: divide the pulse source into high-power local oscillator light and low-power signal light, and separate the local oscillator light and signal light;

[0039] Step 3. Quantum signal Gaussian modulation: The signal light is transmitted to the receiving end, and the information is loaded on the signal light. Here, the Gaussian modulation adopted by the round-trip Gaussian modulation continuous variable quantum key distribution method can ensure that even the largest eavesdropper In the case of eavesdropping to a certain extent, the communication parties can still obtain the maximum amount of informa...

Embodiment 2

[0052] The present invention also provides a round-trip Gaussian modulation continuous variable quantum key distribution device, see figure 2 and image 3 , including sender 1 and receiver 2, where sender 1 includes:

[0053] A pulse source generator 11, which is used to generate a pulse source;

[0054] A beam splitter 12, which is connected to the pulse source generator 11, and is used to divide the pulse source into high-power local oscillator light and low-power signal light; and

[0055] The detection system 13 is connected with the pulse source generator 11, and is used to align the signal light returned to the sending end 1 with the local oscillator light generated locally, and perform coherent detection, and obtain the original encryption by oversampling the back-end electrical signal key;

[0056] Wherein the receiver 2 includes:

[0057] A Gaussian modulation module 21, which is connected to the beam splitter 12 and receives the signal light of the beam splitter...

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Abstract

The invention discloses a reciprocating Gauss modulated continuous variable quantum key distribution method and device. The method comprises the following steps: S1, pulse source generation; S2, local oscillation light and signal light separation; S3, quantum signal Gauss modulation; S4, quantum signal reversal; and S5, quantum signal detection. The method and the device are of very high safety and practicability. By generating local oscillation light at an emitting end and detecting signals at the emitting end, the transmission of local oscillation light is avoided, and eavesdroppers can no longer take advantage of the transmission of local oscillation light. As the local oscillation light and the signal light are from the same light source, the frequency difference is small, the phase jitter is low, and therefore, the phase noise is greatly reduced. Because of the adoption of a reciprocating structure, compensation can be automatically made for polarization drift in the transmission process, and degradation of the system performance caused by polarization drift is avoided. Thus, the scheme improves the long-time stability of the system.

Description

technical field [0001] The invention relates to the field of key distribution, in particular to a round-trip Gaussian modulation continuous variable quantum key distribution method and device. Background technique [0002] Under the background of the rapid development of computer information technology, the requirements of information technology for information security are increasing day by day. In recent years, because the quantum key distribution technology can physically guarantee the unconditional security of communication, it has attracted widespread attention. [0003] Quantum key distribution technology can be generally divided into two categories: discrete variable quantum key distribution and continuous variable quantum key distribution. Compared with discrete variable quantum key distribution, continuous variable quantum key distribution has a higher code rate, so it attracts many researchers to do a lot of theoretical and experimental research. Relying on the b...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0852H04L9/0858
Inventor 黄鹏曾贵华王涛
Owner SHANGHAI JIAO TONG UNIV
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