Quantum conference key negotiation method and system based on coherent detection

A technology of key agreement and coherent detection, which is applied in the field of quantum communication, can solve the problems of increasing security risks and complex equipment, and achieve the effects of reducing security risks, simple equipment, and strong operability

Inactive Publication Date: 2020-12-04
NANJING UNIV
View PDF7 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the required instruments and equipment are relatively complex, and the sending end needs a lot of equipment such as continuous laser, intensity modulator, phase modulator and signal attenuator, and complex operations such as phase randomization and different light intensity modulation are required, which increases the security risk

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Quantum conference key negotiation method and system based on coherent detection
  • Quantum conference key negotiation method and system based on coherent detection
  • Quantum conference key negotiation method and system based on coherent detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as figure 1 As shown, beam splitters are respectively set on the optical paths of the two transmitting ends to split the pulses of the two transmitting ends, one beam is sent to detector 1 and detector 2 for time base vector detection, and the other beam is polarized After the controller modulates the polarization, the pulse polarization of the two transmitting ends is consistent, and then sent to the beam splitter triple beam for interferometric vector detection; beam splitter 1 and beam splitter 2 correspond to sending end 1 and sending end 2 respectively; Polarization controller 1 corresponds to the pulse signal of the sending end 1, and polarization controller 2 corresponds to the pulse signal of the sending end 2; after beam splitter three combines beams, the Mach-Zehnder interference composed of beam splitter four and beam splitter five The pulse signal after interference is sent to detector three and detector four respectively for interferometric base vector...

Embodiment 2

[0091] The structure of the equipment in this embodiment has been greatly adjusted, but it is essentially the same as that of Embodiment 1.

[0092] combine figure 2 , to be specifically described: this embodiment includes two sending ends and a detecting end connected by an unsafe quantum channel; the sending end includes a continuous laser and an intensity modulator; the continuous laser is used to generate phase-stable continuous light; the intensity modulator will The temporally continuous optical signal becomes an optical pulse at a specific moment, and the amplitude of the pulse is modulated to form optical pulses of different intensities;

[0093] The detection end includes a polarization controller, a beam splitter and a detector; in this embodiment, a beam splitter 1 is provided on the optical path of the two sending ends, and the optical fiber distance from one of the sending ends to the beam splitter 1 is longer for The delay is an odd number of half cycles; a pol...

Embodiment 3

[0101] combine image 3 Introduce another way of combining beams - using fast optical switches.

[0102] Compared with the second embodiment, this embodiment is different from the present embodiment in that a fast optical switch is used for beam combining.

[0103] This embodiment includes two sending ends and a detection end connected by an unsafe quantum channel; the sending end includes a continuous laser and an intensity modulator; the continuous laser is used to generate phase-stable continuous light; the intensity modulator converts the continuous light in time The signal becomes a light pulse at a specific moment, and the amplitude of the pulse is modulated to form light pulses of different intensities;

[0104] The detection end includes a polarization controller, a fast optical switch, a beam splitter, and a detector; in this embodiment, a fast optical switch is set on the optical path of the two sending ends, and the optical fiber distance from one of the sending en...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a quantum conference key negotiation method and system based on coherent detection, and the method comprises five stages: preparation, measurement, modulation, parameter estimation and post-processing, data under a time basis vector is used for extracting a quantum conference key, and data under an interference basis vector is used for calculating the contrast. The quantumconference key negotiation system comprises a continuous laser, an intensity modulator, a beam splitter and a single photon detector. The continuous laser generates phase-stable continuous light; theintensity modulator is used for carrying out pulse preparation on the passed optical signal and transmitting a pulse signal to the detection end; the beam splitter I and the beam splitter II are usedfor splitting an optical signal of the transmitting end; the beam splitter III is used for carrying out beam combination on the optical signals; the beam splitter IV and the beam splitter V form a Mach-Zehnder interferometer; the detector detects an optical signal at the detection end. The method is high in operability, experimental equipment is simple, phase randomization and different intensitymodulation are not needed, the safety risk is reduced, and the linear limitation of the code forming rate and the transmission distance in a relay-free quantum conference key agreement protocol is broken through.

Description

technical field [0001] The invention relates to the technical field of quantum communication, in particular to a coherent detection-based quantum conference key agreement method and system. Background technique [0002] Since entering the 21st century, with the rapid development of the Internet, information security has become increasingly important, and private communication between users has become one of the basic needs of the modern information society. With the development of various types of computers, especially the development of quantum computers, the computing power continues to increase, and the encryption algorithm based on computational complexity is no longer safe, and information security is facing increasingly severe challenges. Quantum communication came into being. Quantum communication is an emerging research field derived from the intersection of quantum mechanics and informatics. It uses the basic principles of quantum mechanics to ensure information se...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70H04B10/524H04B10/54H04B10/61
CPCH04B10/524H04B10/54H04B10/614H04B10/70H04L9/0838
Inventor 尹华磊曹啸宇陈增兵
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap