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 PDFInfo
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- 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
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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
Technical Field
The invention designs a quantum key distribution control technology, particularly relates to continuous variable quantum key distribution information source control, and particularly relates to a modulation variance dynamic adjustment method of continuous variable quantum key distribution signal light.
Background
The continuous variable quantum key distribution can generate unconditionally safe keys for both communication parties, has the characteristics of low cost, high stability and high compatibility with a classical system compared with the discrete variable quantum key distribution, is widely researched and concerned, and is already put on a practical road. The most important performance parameter of the continuous variable quantum key distribution system is the security key rate, and the security key rate is obtained by performing parameter estimation operation on statistical information of the received and transmitted data.
Alice and Bob respectively take out a part of the original key (hereinafter referred to as partial data) and perform parameter estimation. And respectively calculating the variance of the partial data by Alice and Bob. Alice sends the calculated variance and part of the data to Bob. At the Bob end, Bob calculates a covariance matrix by using the partial data sent by Alice and the corresponding partial data in his hand. The security code rate can be calculated by the covariance matrix. In security analysis, the security code rate at the time of reverse coordination is usually calculated under a joint attack that best meets the actual situation. The formula is shown as (1).
K＝βIAB-χBE(1)
Wherein β is the coordination efficiency, IABIs mutual information of Alice and Bob, χBEThe mutual information of Alice and Bob is calculated by formula (2) for the maximum amount of information available to Eve.
Where V is the modulation variance, χtotExpressed as χ for total noisetot＝χline+χhom/T,χhomIs the total noise of the homodyne detector introduced by the Bob end and is expressed as chihom＝[(1-η)+υel]V η and velExpressed as detector efficiency and detector electrical noise, respectively. The information obtained by Eve is an upper bound of the amount of Holevo, which can be calculated by equation (3).
s (ρ) is von neumann entropy of quantum state ρ, and the calculation method is as shown in (4).
Wherein G (x) ═ x +1) log2(x+1)-x log2x，λiThe symplectic eigenvalues of the covariance matrix gamma of the p states. The Gaussian AB depends on the covariance matrix gammaABThe covariance matrix is shown in (5).
WhereinχlineIs channel noise, expressed as χline1/T-1+ epsilon, epsilon is the excess noise and T is the channel transmission efficiency. Its characteristic octane number λ1,2Calculated by equation (6).
Computing entropyNeed to be calculated by calculating a covariance matrixObtaining the covariance matrixAs shown in (7).
WhereinMP represents the Moore-Penrose inverse matrix. Gamma rayB,γAFG,Can be derived from the covariance matrix as shown in (8).
According to the system
Wherein,
matrix gammaF0GIs the EPR state that describes the variance v of the detector electrical noise. Calculating the octane characteristic value lambda according to (10)3,4,5。
Last octan eigenvalue λ51. Then Eve obtains the information as
And finally, substituting (2) and (11) into (1) to calculate the security code rate under the joint attack.
The continuous face-changing quantum key distribution system has an optimal signal light modulation variance according to different system parameters, so that the system security key rate is highest, as shown in fig. 1. However, the system parameters may change due to environmental changes, and thus the optimal modulation variance of the transmitting-end signal light changes continuously.
In the existing continuous variable quantum key distribution system, the modulation variance of the signal light at the transmitting end is a fixed value, so that the highest safe key rate cannot be maintained under different conditions. The invention obtains real-time channel parameters through the parameter estimation result, calculates to obtain the optimal modulation variance under the current condition, realizes the real-time adjustment of the optical modulation variance of the signal at the sending end, and ensures that the optimal system performance can still be realized under different environmental conditions.
Disclosure of Invention
Technical problem to be solved
Aiming at the problem that the modulation variance of a continuous variable quantum key distribution system can not change along with the change of the environment, the invention provides a dynamic modulation variance adjusting method for signal light distributed by a continuous variable quantum key.
(II) technical scheme
The invention provides a modulation variance dynamic adjustment method of continuous variable quantum key distribution signal light, which comprises the following four steps:
step 1: the transmitting end selects an initial modulation variance of the signal light according to the system parameters to prepare a corresponding quantum state;
step 2: the receiving end selects the measuring result and transmits the measuring result to the transmitting end to carry out parameter estimation, and real-time channel parameters are obtained;
and step 3: and the transmitting end adjusts the modulation variance in real time according to the parameter estimation result.
The steps are sequentially carried out
The method for selecting the signal light initial modulation variance according to the system parameters in the step 1 comprises the following steps: and selecting the initial modulation variance of the signal light according to parameters such as the transmission distance of the system, the detector efficiency, the detector noise and the like.
The parameter estimation method in the step 2 comprises the following steps: the receiving end measures data, selects a measurement result with a proper proportion and transmits the measurement result to the receiving end for parameter estimation, and channel parameters (channel transmissivity, channel excess noise and the like) which change in real time are obtained.
The method for adjusting the modulation variance in real time according to the parameter estimation result in the step 3 comprises the following steps: and calculating the optimal modulation variance according to the channel parameters acquired in real time, and changing the modulation variance according to the calculation result.
(III) advantageous effects
1. The invention obtains real-time channel parameters through parameter estimation and calculates the optimal signal light modulation variance, so that the security key rate of the system keeps higher level under different channel parameter conditions.
Drawings
FIG. 1 is a diagram illustrating a relationship between modulation variance and security key rate
FIG. 2 is a flow chart of the present invention
Detailed Description
The invention adjusts the modulation variance of the signal light of the continuous variable quantum key distribution system by the way of acquiring real-time channel parameters and calculating the optimal modulation variance through parameter estimation, thereby keeping the security key rate of the system at a higher level under the condition of different channel parameters, and the specific steps are as follows:
1. the system sending end selects the initial modulation variance of the signal light according to the system parameters (channel length, detector efficiency, detector electrical noise and the like), prepares a quantum state and sends the quantum state to the receiving end.
2. The receiving end detects the quantum state, selects part of the measurement result to transmit to the transmitting end, and performs parameter estimation operation with the corresponding data to obtain parameters such as real-time channel transmissivity and channel excess noise.
3. And the transmitting end calculates the optimal modulation variance according to the channel parameters acquired in real time, changes the modulation variance according to the calculation result, prepares a new quantum state and transmits the new quantum state to the receiving end.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (4)
1. A modulation variance dynamic adjustment method for continuous variable quantum key distribution signal light is characterized by comprising the following steps:
step 1: the transmitting end selects an initial modulation variance of the signal light according to the system parameters to prepare a corresponding quantum state;
step 2: the receiving end selects the measuring result and transmits the measuring result to the transmitting end to carry out parameter estimation, and real-time channel parameters are obtained;
and step 3: and the transmitting end adjusts the modulation variance in real time according to the parameter estimation result.
The steps are sequentially carried out.
2. The method according to claim 1, wherein the method for dynamically adjusting the modulation variance of signal light distributed by using a continuous variable quantum key in step 1 according to the system parameters comprises: and calculating the signal light initial modulation variance according to parameters such as the transmission distance of the system, the detector efficiency, the detector noise and the like.
3. The method according to claim 1, wherein the parameter estimation in step 2 is performed by: the receiving end measures data, selects a measurement result with a proper proportion and transmits the measurement result to the receiving end for parameter estimation, and channel parameters (channel transmissivity, channel excess noise and the like) which change in real time are obtained.
4. The method according to claim 1, wherein the step 3 of adjusting the modulation variance in real time according to the parameter estimation result comprises: and calculating the optimal modulation variance through the channel parameters acquired in real time, and changing the modulation variance of the signal light according to the calculation result.
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Cited By (3)
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| 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 |
| CN116112093A (en) * | 2022-12-28 | 2023-05-12 | 中国电子科技集团公司第三十研究所 | High-precision modulation variance control method and device for CV-QKD chip system |
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| 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 |
| CN116112093A (en) * | 2022-12-28 | 2023-05-12 | 中国电子科技集团公司第三十研究所 | High-precision modulation variance control method and device for CV-QKD chip system |
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Application publication date: 20180501 |