CN107979464A - The dynamic regulating method of flashlight modulation variance in a kind of continuous variable quantum key distribution - Google Patents

The dynamic regulating method of flashlight modulation variance in a kind of continuous variable quantum key distribution Download PDF

Info

Publication number
CN107979464A
CN107979464A CN201810076855.0A CN201810076855A CN107979464A CN 107979464 A CN107979464 A CN 107979464A CN 201810076855 A CN201810076855 A CN 201810076855A CN 107979464 A CN107979464 A CN 107979464A
Authority
CN
China
Prior art keywords
flashlight
parameter
variance
modulation
modulation variance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810076855.0A
Other languages
Chinese (zh)
Inventor
喻松
赵甲
赵一甲
张辰
张一辰
王翔宇
郑子勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Posts and Telecommunications
Original Assignee
Beijing University of Posts and Telecommunications
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Posts and Telecommunications filed Critical Beijing University of Posts and Telecommunications
Priority to CN201810076855.0A priority Critical patent/CN107979464A/en
Publication of CN107979464A publication Critical patent/CN107979464A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0852—Quantum cryptography
    • H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a kind of dynamic regulating method of continuous variable quantum key distribution flashlight modulation variance, for choosing the optimal modulation variance of flashlight in real time according to channel parameter.Include the following steps：1. transmitting terminal chooses the initial modulation variance of flashlight according to systematic parameter；2. parameter Estimation, obtains Real-time Channel parameter；3. according to parameter estimation result, modulation variance is adjusted in real time.By the real-time dynamic regulation of modulation variance to flashlight, the safe key rate of system is set to keep higher level under different channels Parameter Conditions.

Description

The dynamic regulation of flashlight modulation variance in a kind of continuous variable quantum key distribution Method
Technical field
Present invention design quantum key distribution control technology, more particularly to continuous variable quantum key distribution information source control, The modulation methods difference dynamic regulating method of especially a kind of continuous variable quantum key distribution flashlight.
Background technology
Continuous variable quantum key distribution can be the key that communicating pair produces unconditional security, compared to discrete variable Quantum key distribution, there is a low cost, high stability, with classical system compatibility it is high the characteristics of, widely studied and paid close attention to, Walk on practical road.The most important performance parameter of continuous variable quantum key distribution system is safe key rate, Safe key rate is obtained by carrying out parameter Estimation computing to the statistical information of transceiving data.
Alice and Bob takes out a part (hereinafter referred to as partial data) for primary key respectively, carries out parameter Estimation. Alice and Bob calculates the variance of partial data respectively.The variance and partial data that are calculated are sent to Bob by Alice. At Bob ends, Bob calculates covariance matrix using the Alice partial datas sended over and the partial data to being answered in oneself hand. Safe code check can be calculated by covariance matrix.In safety analysis, usually attacked to best suiting combining for actual conditions Hit down, the safe code check of reverse universal time coordinated is calculated.Formula is such as shown in (1).
K=β IAB-χBE (1)
Wherein β is coordinating efficiency, IABFor the mutual information of Alice and Bob, χBEFor maximum fault information obtained by Eve, The mutual information of Alice and Bob can be calculated by formula (2).
Wherein V is to modulate variance, χtotFor overall noise, χ is expressed astot=χline+χhom/T,χhomIt is zero that Bob ends introduce The overall noise of gap detector, is expressed as χhom=[(1- η)+υel]/η, η and υelIt is expressed as detector efficiency and detector electricity Noise.The information that Eve is obtained is the upper bound of Holevo amounts, can be calculated by formula (3).
S (ρ) is the von Neumann entropy of quantum state ρ, and computational methods are such as shown in (4).
Wherein G (x)=(x+1) log2(x+1)-x log2X, λiRepresent the pungent characteristic value of the covariance matrix γ of ρ states.It is high This state AB depends on covariance matrix γAB, covariance matrix is such as shown in (5).
WhereinχlineFor interchannel noise, χ is expressed asline=1/T-1+ ε, ε are excessive Noise, T are channel transport efficiency.Its pungent eigenvalue λ1,2It is calculated by formula (6).
Calculate entropyNeed by calculating covariance matrixPungent feature be worth to, covariance matrixSuch as (7) shown in.
WhereinMP represents Moore-Penrose inverse matrixs.γB,γAFG,Can be from covariance square Obtained in battle array, such as shown in (8).
According to system
Wherein,
Matrix γF0GIt is the EPR states for describing the variance υ of detector electrical noise.Pungent characteristic value is calculated according to (10) λ3,4,5。
Last pungent eigenvalue λ5=1.Then the information of Eve acquisitions is
Finally, (2) and (11) are substituted into (1) to the safe code check that can be calculated under ganging up against.
There are an optimal flashlight modulation methods according to different systematic parameters for continuous Face Changing quantum key distribution system Difference so that system safe key rate highest, as shown in Figure 1.But systematic parameter can constantly change due to environmental change, hair The optimal modulation variance of sending end flashlight is continually changing.
In existing continuous variable quantum key distribution system, the modulation variance of transmitting terminal flashlight is a fixed value, It is thus impossible to all keep highest safe key rate in different situations.The present invention obtains letter in real time by parameter estimation result Road parameter, is calculated the optimal modulation variance under present case, realizes real-time the adjusting to transmitting terminal flashlight modulation variance, Ensure still realize optimal system performance under different ambient conditions.
The content of the invention
(1) technical problems to be solved
The problem of cannot changing for continuous variable quantum key distribution system modulation variance with environmental change, the present invention A kind of modulation methods difference dynamic regulating method of continuous variable quantum key distribution flashlight is proposed, is obtained in real time by parameter Estimation Channel parameter is taken, and optimal flashlight is calculated according to channel parameter and modulates variance, ensures the higher safe key rate of system.
(2) technical solution
A kind of modulation methods difference dynamic regulating method of continuous variable quantum key distribution flashlight provided by the invention, including Four steps：
Step 1：Transmitting terminal chooses the initial modulation variance of flashlight according to systematic parameter, prepares corresponding quantum state；
Step 2：Receiving terminal chooses measurement result and is transferred to transmitting terminal progress parameter Estimation, obtains Real-time Channel parameter；
Step 3：Transmitting terminal adjusts modulation variance in real time according to parameter estimation result.
Above step carries out successively in order
It is according to the method for systematic parameter selection flashlight initial modulation variance in the step 1：According to the transmission of system The parameters such as distance, detector efficiency, noise of detector choose the initial modulation variance of flashlight.
The method of parameter Estimation is in the step 2：Receiving terminal measures data, chooses the measurement knot of proper ratio Fruit is transferred to receiving terminal and carries out parameter Estimation, obtains the channel parameter (channel transmissivity, channel excess noise etc.) of real-time change.
According to parameter estimation result in the step 3, the method for adjusting modulation variance in real time is：Pass through the letter obtained in real time Road parameter, calculates optimal modulation variance, and changes modulation variance according to result of calculation.
(3) beneficial effect
1. the present invention obtains Real-time Channel parameter by parameter Estimation, and calculates Optimal Signals light modulation variance, make system Safe key rate higher level is kept under different channels Parameter Conditions.
Brief description of the drawings
Fig. 1 is the correspondence of modulation variance and safe key rate
Fig. 2 is the FB(flow block) of the present invention
Embodiment
The present invention adjusts continuous change by way of parameter Estimation obtains Real-time Channel parameter and calculates optimal modulation variance The modulation variance of quantum key distribution system flashlight is measured, so that the safe key rate of system is under different channels Parameter Conditions Higher level is kept, is comprised the following steps that：
1. system transmitting terminal chooses signal according to systematic parameter (channel length, detector efficiency, detector electrical noise etc.) The initial modulation variance of light, prepares quantum state, is sent to receiving terminal.
2. receiving terminal detects quantum state, selected part measurement result is transmitted to transmitting terminal, with corresponding data into Row parameter Estimation computing, obtains the parameters such as real-time channel transmissivity, channel excess noise.
3. transmitting terminal calculates optimal modulation variance, and change according to result of calculation and adjust according to the channel parameter obtained in real time Variance processed, prepares new quantum state and sends to receiving terminal.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (4)

  1. A kind of 1. modulation methods difference dynamic regulating method of continuous variable quantum key distribution flashlight, it is characterised in that including：
    Step 1：Transmitting terminal chooses the initial modulation variance of flashlight according to systematic parameter, prepares corresponding quantum state；
    Step 2：Receiving terminal chooses measurement result and is transferred to transmitting terminal progress parameter Estimation, obtains Real-time Channel parameter；
    Step 3：Transmitting terminal adjusts modulation variance in real time according to parameter estimation result.
    Above step carries out successively in order.
  2. A kind of 2. modulation methods difference dynamic regulation side of continuous variable quantum key distribution flashlight according to claim 1 Method, it is characterised in that be according to the method for systematic parameter selection flashlight modulation variance in the step 1：According to the biography of system The parameters such as defeated distance, detector efficiency, noise of detector calculate flashlight initial modulation variance.
  3. A kind of 3. modulation methods difference dynamic regulation side of continuous variable quantum key distribution flashlight according to claim 1 Method, it is characterised in that the method for parameter Estimation is in the step 2：Receiving terminal measures data, chooses proper ratio Measurement result is transferred to receiving terminal and carries out parameter Estimation, and obtaining the channel parameter of real-time change, (channel transmissivity, channel are excessively made an uproar Sound etc.).
  4. A kind of 4. modulation methods difference dynamic regulation side of continuous variable quantum key distribution flashlight according to claim 1 Method, it is characterised in that according to parameter estimation result in the step 3, the method for adjusting modulation variance in real time is：By obtaining in real time The channel parameter taken, calculates optimal modulation variance, and changes the modulation variance of flashlight according to result of calculation.
CN201810076855.0A 2018-01-26 2018-01-26 The dynamic regulating method of flashlight modulation variance in a kind of continuous variable quantum key distribution Pending CN107979464A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810076855.0A CN107979464A (en) 2018-01-26 2018-01-26 The dynamic regulating method of flashlight modulation variance in a kind of continuous variable quantum key distribution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810076855.0A CN107979464A (en) 2018-01-26 2018-01-26 The dynamic regulating method of flashlight modulation variance in a kind of continuous variable quantum key distribution

Publications (1)

Publication Number Publication Date
CN107979464A true CN107979464A (en) 2018-05-01

Family

ID=62006289

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810076855.0A Pending CN107979464A (en) 2018-01-26 2018-01-26 The dynamic regulating method of flashlight modulation variance in a kind of continuous variable quantum key distribution

Country Status (1)

Country Link
CN (1) CN107979464A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110635896A (en) * 2019-08-26 2019-12-31 上海循态信息科技有限公司 Blind parameter estimation method for continuous variable quantum key distribution
CN110677244A (en) * 2019-09-19 2020-01-10 中国电子科技集团公司第三十研究所 Self-balancing method suitable for continuous variable quantum key distribution system

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101079635A (en) * 2007-05-24 2007-11-28 北京邮电大学 Joint scalar quantity quantification method and level quantification method of self-adapted scalar quantity adjustment
US7403623B2 (en) * 2002-07-05 2008-07-22 Universite Libre De Bruxelles High-rate quantum key distribution scheme relying on continuously phase and amplitude-modulated coherent light pulses
US20090268901A1 (en) * 2004-12-15 2009-10-29 Thales Continuous variable quantum encryption key distribution system
CN103983998A (en) * 2014-05-29 2014-08-13 北京信息科技大学 Integrated navigation intelligent alignment method based on Kalman filtering and feedback control
US20140269790A1 (en) * 2013-03-15 2014-09-18 Digital Signal Corporation System and method for increasing coherence length in lidar systems
CN106789035A (en) * 2017-01-18 2017-05-31 北京邮电大学 A kind of signal to noise ratio self-adapting data coordination approach in the quantum key distribution system for continuous variable
CN107359987A (en) * 2017-07-07 2017-11-17 上海交通大学 Continuous variable quantum key distribution multidimensional machinery of consultation under finite dimensional effect
CN107566120A (en) * 2017-09-28 2018-01-09 上海交通大学 Local local oscillator continuous variable quantum key delivering method and system
CN107612688A (en) * 2017-09-30 2018-01-19 上海交通大学 CVQKD real-time performances optimization method and system based on machine learning

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7403623B2 (en) * 2002-07-05 2008-07-22 Universite Libre De Bruxelles High-rate quantum key distribution scheme relying on continuously phase and amplitude-modulated coherent light pulses
US20090268901A1 (en) * 2004-12-15 2009-10-29 Thales Continuous variable quantum encryption key distribution system
CN101079635A (en) * 2007-05-24 2007-11-28 北京邮电大学 Joint scalar quantity quantification method and level quantification method of self-adapted scalar quantity adjustment
US20140269790A1 (en) * 2013-03-15 2014-09-18 Digital Signal Corporation System and method for increasing coherence length in lidar systems
CN103983998A (en) * 2014-05-29 2014-08-13 北京信息科技大学 Integrated navigation intelligent alignment method based on Kalman filtering and feedback control
CN106789035A (en) * 2017-01-18 2017-05-31 北京邮电大学 A kind of signal to noise ratio self-adapting data coordination approach in the quantum key distribution system for continuous variable
CN107359987A (en) * 2017-07-07 2017-11-17 上海交通大学 Continuous variable quantum key distribution multidimensional machinery of consultation under finite dimensional effect
CN107566120A (en) * 2017-09-28 2018-01-09 上海交通大学 Local local oscillator continuous variable quantum key delivering method and system
CN107612688A (en) * 2017-09-30 2018-01-19 上海交通大学 CVQKD real-time performances optimization method and system based on machine learning

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
PAUL JOUGUET ET AL.: "《Experimental demonstration of long-distance continuous-variable quantum key distribution》", 《NATURE PHOTONICS》 *
PAUL JOUGUET ET AL.: "《Long-distance continuous-variable quantum key distribution with a Gaussian modulation》", 《PHYSICAL REVIEW A》 *
PENG HUANG ET AL.: "《State-discrimination attack on discretely modulated continuous-variable quantum key distribution》", 《PHYSICAL REVIEW A》 *
曹正文等: "《基于散粒噪声方差实时监测的连续变量量子密钥分发系统的设计与实现》", 《物理学报》 *
沈咏等: "《离散调制连续变量量子密钥分发的安全边界》", 《物理学报》 *
王天一: "《基于连续变量的量子密钥分发系统中长距离传输技术与安全性研究》", 《中国博士学位论文全文数据库 信息科技辑》 *
陈岩等: "《基于单脉冲多位编码的全光纤连续变量量子密钥分发》", 《光学学报》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110635896A (en) * 2019-08-26 2019-12-31 上海循态信息科技有限公司 Blind parameter estimation method for continuous variable quantum key distribution
CN110635896B (en) * 2019-08-26 2022-03-15 上海循态量子科技有限公司 Blind parameter estimation method for continuous variable quantum key distribution
CN110677244A (en) * 2019-09-19 2020-01-10 中国电子科技集团公司第三十研究所 Self-balancing method suitable for continuous variable quantum key distribution system
CN110677244B (en) * 2019-09-19 2022-03-18 中国电子科技集团公司第三十研究所 Self-balancing method suitable for continuous variable quantum key distribution system

Similar Documents

Publication Publication Date Title
Gafni et al. Federated learning: A signal processing perspective
Elsayed et al. Large margin deep networks for classification
KR101888683B1 (en) Method and apparatus for detecting anomaly traffic
CN107979464A (en) The dynamic regulating method of flashlight modulation variance in a kind of continuous variable quantum key distribution
CN106789035B (en) Signal-to-noise ratio self-adaptive data coordination method for continuous variable quantum key distribution system
CN108365953A (en) Adaptive differential phase shift quantum key dissemination system based on deep neural network and its implementation
CN110071798A (en) A kind of equivalent key acquisition methods, device and computer readable storage medium
Zhao et al. Robust nonparametric kernel regression estimator
CN107257254A (en) A kind of permanent mould beam form-endowing method in safe and secret communication system
Zhang et al. Optical image compression and encryption transmission-based ondeep learning and ghost imaging
Mortaheb et al. FedGradNorm: Personalized federated gradient-normalized multi-task learning
Ma et al. Modulation format identification based on constellation diagrams in adaptive optical OFDM systems
Jiang et al. Digital twin aided massive MIMO: CSI compression and feedback
CN113590571A (en) Method and system for sharing private cloud resources and public cloud resources
Thonglek et al. Sparse communication for federated learning
Chen et al. Rate distortion optimization for adaptive gradient quantization in federated learning
Wang et al. One-way deficit of two-qubit X states
CN111327558B (en) Method and system for GMM non-uniform quantization for filter multi-carrier modulation optical communication
Choi et al. Semantics alignment via split learning for resilient multi-user semantic communication
CN114826396A (en) Method and device for controlling pumping by monitoring Raman amplifier reflected power
CN101079635B (en) Joint scalar quantity quantification method and level quantification method of self-adapted scalar quantity adjustment
Chen et al. Fed-QSSL: A Framework for Personalized Federated Learning under Bitwidth and Data Heterogeneity
EP3211850B1 (en) Ir state return cycle selection method and device for rohc compressor, and storage medium
Bai et al. In UOWC systems: A combined PAPR reduction method by PTS approach based on improved particle swarm optimization
CN108599949A (en) A kind of security key rate calculations method and system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20180501