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CVQKD system and method for monitoring shot noise variance thereof in real time

A technology of shot noise and variance, which is applied in the field of secure communication of CVQKD system, can solve the problems of not obtaining shot noise in real time and the variance of shot noise, etc., and achieve the effect of resisting local oscillator light intensity attacks and improving security

Active Publication Date: 2015-12-09
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this technique does not obtain the shot noise variance in real time, only before the key distribution
When Eve attacks the local oscillator during the key distribution process, the actual shot noise variance of the system changes, but the shot noise scaling technique cannot obtain the changed shot noise variance

Method used

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  • CVQKD system and method for monitoring shot noise variance thereof in real time
  • CVQKD system and method for monitoring shot noise variance thereof in real time
  • CVQKD system and method for monitoring shot noise variance thereof in real time

Examples

Experimental program
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Effect test

Embodiment 1

[0081] Such as Figure 4 As shown, this embodiment provides a CVQKD system, including a sending end and a receiving end, wherein:

[0082] The sending end and the traditional CVQKD include QKD light source, internal optical path of Alice end, clock synchronization system (SyncLaser), wavelength division multiplexer CWDM and Alice end control circuit; AM is an amplitude modulator; the sending end uses a laser light source module with a wavelength of 1550nm , to generate a signal light pulse with a frequency of 1MHz, a pulse width of 1us, and a duty cycle of 10%; the clock synchronization system is used to generate a synchronous clock pulse with a wavelength of 1310nm, with a frequency of 1MHz, a pulse width of 1us, and a duty cycle of 50 %; The signal triggers of the QKD light source and the synchronous light source are all generated by the PCI6115 data acquisition card at the side of Alice.

[0083] The receiving end includes a wavelength division multiplexer CWDM, a polarizati...

Embodiment 2

[0086] Step 1. When no light enters the Homodyne detector, use the Homodyne detector to detect the intensity of electrical noise and obtain the variance of the electrical noise at this time is the absolute electrical noise variance. However, the system of the present invention needs to obtain Normalized to the relative value of the shot noise variance υ el .

[0087] Step 2, add the first adjustable optical attenuator ATT1 on the quantum signal optical path of the internal optical path at the Bob end, and the first adjustable optical attenuator ATT1 is used to adjust the intensity of the quantum signal light; at the same time, the local oscillator of the internal optical path at the Bob end The second adjustable optical attenuator ATT2 is added on the optical path, and the second adjustable optical attenuator ATT2 is used to adjust the intensity of the local oscillator light; at the same time, a beam splitter BS with a splitting ratio of 10 / 90 is added to the optical pat...

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Abstract

The invention discloses a CVQKD system and a method for monitoring the shot noise variance thereof in real time. According to the CVQKD system, in a receiving end, signal light is split into quantum signal light and local oscillation light after passing through a polarization beam splitter. A first adjustable optical attenuator is arranged on a quantum signal light path, and the quantum signal light enters a 50 / 50 beam splitter. A second adjustable optical attenuator and a 10 / 90 beam splitter are sequentially arranged on a local oscillation light path along the direction of the local oscillation light. 10% of the local oscillation light output by the 10 / 90 beam splitter is sent to a photoelectric detector, and 90% of the local oscillation light sequentially enters the 50 / 50 beam splitter after passing through the polarization beam splitter, a phase modulator and a Faraday mirror, and interferes with the quantum signal light. The output end of the 50 / 50 beam splitter is connected with a Homodyne detector. The output ends of the Homodyne detector and the photoelectric detector are connected to a Bob-end control circuit. The method and the system can effectively resist the attack of Eve to local oscillation light, and therefore, the safety of the CVQKD system is effectively improved.

Description

technical field [0001] The invention belongs to the field of quantum security communication, and relates to a CVQKD system security communication method. Specifically, the variance of shot noise is monitored in real time to effectively resist the attack of Eve on the light intensity of the local oscillator, thereby improving the communication quality. Background technique [0002] Document 1 "P.Jouguet, S.Kunz-Jacques, T.Debuisschert, Opt.Express20, 14030 (2012)." proposes a security analysis method under the E-B model, which ignores that the local oscillator may be eavesdropped ( Eve) attack; the local oscillator light is attacked by an eavesdropper, which will cause the light intensity of the local oscillator to change, and then the variance of the system shot noise will also change; and in the system security analysis, all noise parameters of the system must be normalized to Shot noise variance. When Eve controls the local oscillator to make the shot noise variance smalle...

Claims

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Application Information

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IPC IPC(8): H04B10/70H04B10/85
Inventor 曹正文赵光韩二虎彭进业曾贵华张爽浩
Owner NORTHWEST UNIV
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