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Optical injection-based CV-QKD system and sending end, receiving end and CV-QKD method

A technology of optical injection and sending end, which is applied in the field of quantum communication, can solve problems such as complex technical solutions, and achieve the effect of improving the coding rate, reducing additional noise, and simple solutions

Active Publication Date: 2019-10-29
ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The necessity of the local oscillator pulse also makes the technical solution of CV-QKD more complicated than that of DV-QKD

Method used

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  • Optical injection-based CV-QKD system and sending end, receiving end and CV-QKD method
  • Optical injection-based CV-QKD system and sending end, receiving end and CV-QKD method
  • Optical injection-based CV-QKD system and sending end, receiving end and CV-QKD method

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Experimental program
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Embodiment 1

[0099] see figure 2 , the CV-QKD system of this embodiment includes a sending end (Alice end) and a receiving end (Bob end), and a phase modulation light source is provided in the sending end, and the phase modulation light source includes:

[0100] Phase preparation lasers for generating long pulses with phase difference information;

[0101] A pulse generating laser is used for receiving and being excited by the long pulse to generate a plurality of short pulses with corresponding phase differences, and at least one of the short pulses is used as a signal pulse.

[0102] A fiber optic circulator is used between the phase preparation laser and the pulse generation laser to control the direction of the optical signal.

[0103] The output end of the phase modulation light source is provided with a variable optical attenuator and a polarization beam splitter in turn, wherein one path of the horizontally polarized light in the polarization beam splitter is used as the output of...

Embodiment 2

[0127] see Figure 6 , in Embodiment 1, the amplitude modulation of the signal pulse is accomplished by adjusting the driving voltage of the pulse-generating laser. However, in this embodiment, the amplitude modulation is accomplished jointly by an external variable optical attenuator (VATT) and an amplitude modulator (AM).

[0128] At this time, the three pulse driving voltages in the pulse generating laser are all V0, and the driving voltages are no longer modulated. The subsequently generated pulses are modulated by VATT to greatly attenuate the intensity of the signal pulses (here, the definitions of signal pulses and local oscillator pulses are the same as those in Embodiment 1). The pulses then enter the AM, which Gaussian modulates the amplitude of the signal pulses according to the value of the corresponding random number pair.

[0129] The rest of the steps in this embodiment are the same as those in Embodiment 1, so they will not be described in detail.

Embodiment 3

[0131] On the basis of generating three short pulses at a time in this embodiment 1 and 2, it can be further extended to make one long pulse generate more short pulses, and the position of pulses in a pulse group in terms of timing is: weak, strong, weak.... Strength ("weak" means signal pulse, "strong" means local oscillator pulse), see Figure 7 . At this time, the phases of the signal pulses in the pulse group are modulated by the optical injection technique (same as that in Embodiment 1). The amplitude modulation can be performed by modulating the driving voltage of the pulse-generating laser in implementation 1, or by externally connecting VATT and AM in embodiment 2.

[0132] The remaining steps of this embodiment are the same as those of Embodiments 1 and 2, and will not be described in detail.

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Abstract

The invention discloses a CV-QKD system based on optical injection, a transmitting end, a receiving end and a CV-QKD method. The CV-QKD method based on optical injection provided by the invention comprises the steps of generating a signal pulse and a local oscillator pulse; carrying out phase modulation and amplitude modulation on the signal pulse at the transmitting end; and carrying out measurement and postprocessing on the local oscillator pulse and the modulated signal pulse at the receiving end, thereby finishing distributing quantum keys, wherein the phase modulation of the signal pulse is carried out at the transmitting end in a phase modulation optical source by an internal modulation mode. Compared with original CV-QKD based on a continuous state, the system, the transmitting end, the receiving end and the method have the advantages that through utilization of an optical injection technology, time demultiplexing and multiplexing and polarization demultiplexing and multiplexing devices required by traditional CV-QKD are not needed, so the scheme provided by the invention is more concise and the reliability of the scheme is improved; and a device is simplified, so additional noise of the scheme is reduced and a code rate is improved.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a CV-QKD system based on optical injection, a sending end, a receiving end and a CV-QKD method. Background technique [0002] As a booming subject, quantum information has successfully applied the basic theory of quantum mechanics directly to solve major practical problems for the first time, and has led the rapid development of related industries. In the field of quantum information, quantum key distribution (QKD) is an important subtopic that has been extensively studied. The research and promotion of QKD will fundamentally solve the problem of information security. The QKD mechanism based on the basic theory of quantum mechanics allows both parties to negotiate to generate a secure key in an environment where eavesdropping exists. Therefore, the research on QKD has revolutionary significance in the field of information security, and it has a very broad prospect of practic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/524H04B10/54H04B10/548H04B10/61H04L9/08
CPCH04B10/524H04B10/54H04B10/548H04B10/6151H04B10/6162H04L9/0838H04L9/0858
Inventor 富尧朱伟
Owner ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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