自由空间量子通信会受到雾霾、沙尘、降雨等自然环境的干扰.为提升环境干扰下量子通信的性能,本文提出了基于软件定义量子通信(software defined quantum communication,SDQC)的自由空间量子通信信道参数自适应调整策略.该策略通过对环...自由空间量子通信会受到雾霾、沙尘、降雨等自然环境的干扰.为提升环境干扰下量子通信的性能,本文提出了基于软件定义量子通信(software defined quantum communication,SDQC)的自由空间量子通信信道参数自适应调整策略.该策略通过对环境状态实时监测,根据预置在应用层的程序,对量子初始状态及单量子态存在时间等相关参数进行自适应调整,提高自然环境背景干扰下自由空间量子通信系统的保真度.仿真结果表明,在退极化、自发幅度衰变及相位阻尼三种噪声信道参数取值不同时,SDQC系统参数的最佳取值也不同.系统根据环境变化及业务需求,自适应地选择量子初始状态及单量子态存在时间,使量子保真度在通信过程中始终保持在峰值,有效提升了量子通信系统的适应能力及综合免疫力.展开更多
In the field of quantum communication,quantum steganography is an important branch of quantum information hiding.In a realistic quantum communication system,quantum noises are unavoidable and will seriously impact the...In the field of quantum communication,quantum steganography is an important branch of quantum information hiding.In a realistic quantum communication system,quantum noises are unavoidable and will seriously impact the safety and reliability of the quantum steganographic system.Therefore,it is very important to analyze the influence of noise on the quantum steganography protocol and how to reduce the effect of noise.This paper takes the quantum steganography protocol proposed in 2010 as an example to analyze the effects of noises on information qubits and secret message qubits in the four primary quantum noise environments.The results show that when the noise factor of one quantum channel noise is known,the size of the noise factor of the other quantum channel can be adjusted accordingly,such as artificially applying noise,so that the influence of noises on the protocol is minimized.In addition,this paper also proposes a method of improving the efficiency of the steganographic protocol in a noisy environment.展开更多
In the quantized field formalism, using Kramers-Henneberger unitary transformation as the semi-classical counterpart of Block-Nordsieck transformation, the dynamics of entanglement during the low energy scattering pro...In the quantized field formalism, using Kramers-Henneberger unitary transformation as the semi-classical counterpart of Block-Nordsieck transformation, the dynamics of entanglement during the low energy scattering processes in bi-partite systems at the presence of a laser beam fields are studied. The stationary-state Schrodinger equation for the quantum scattering process is obtained for such systems. Then, using partial wave analysis, we introduce a new form of entanglement fidelity considering the effect of high-intensity laser beam fields. The effective potential of hot quantum plasma including plasmon and quantum screening effects is used to obtain the entanglement fidelity ratio as a function of the laser amplitude, and plasmon and Debye length parameters for the elastic electron-ion collisions. It is shown that the plasma free electrons oscillations under interaction with laser beam fields improve the correlations between charged particles and consequently lead to the increase in the system entanglement.展开更多
文摘自由空间量子通信会受到雾霾、沙尘、降雨等自然环境的干扰.为提升环境干扰下量子通信的性能,本文提出了基于软件定义量子通信(software defined quantum communication,SDQC)的自由空间量子通信信道参数自适应调整策略.该策略通过对环境状态实时监测,根据预置在应用层的程序,对量子初始状态及单量子态存在时间等相关参数进行自适应调整,提高自然环境背景干扰下自由空间量子通信系统的保真度.仿真结果表明,在退极化、自发幅度衰变及相位阻尼三种噪声信道参数取值不同时,SDQC系统参数的最佳取值也不同.系统根据环境变化及业务需求,自适应地选择量子初始状态及单量子态存在时间,使量子保真度在通信过程中始终保持在峰值,有效提升了量子通信系统的适应能力及综合免疫力.
基金This work was supported by the National Natural Science Foundation of China(Nos.61373131,61303039,61232016,61501247)the Six Talent Peaks Project of Jiangsu Province(Grant No.2015-XXRJ-013)+3 种基金Natural Science Foundation of Jiangsu Province(Grant No.BK20171458)the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province(China under Grant No.16KJB520030)Sichuan Youth Science and Technique Foundation(No.2017JQ0048)NUIST Research Foundation for Talented Scholars(2015r014),PAPD and CICAEET funds.
文摘In the field of quantum communication,quantum steganography is an important branch of quantum information hiding.In a realistic quantum communication system,quantum noises are unavoidable and will seriously impact the safety and reliability of the quantum steganographic system.Therefore,it is very important to analyze the influence of noise on the quantum steganography protocol and how to reduce the effect of noise.This paper takes the quantum steganography protocol proposed in 2010 as an example to analyze the effects of noises on information qubits and secret message qubits in the four primary quantum noise environments.The results show that when the noise factor of one quantum channel noise is known,the size of the noise factor of the other quantum channel can be adjusted accordingly,such as artificially applying noise,so that the influence of noises on the protocol is minimized.In addition,this paper also proposes a method of improving the efficiency of the steganographic protocol in a noisy environment.
基金partially supported by the Ferdowsi University of Mashhad under Grant No. 3/43953。
文摘In the quantized field formalism, using Kramers-Henneberger unitary transformation as the semi-classical counterpart of Block-Nordsieck transformation, the dynamics of entanglement during the low energy scattering processes in bi-partite systems at the presence of a laser beam fields are studied. The stationary-state Schrodinger equation for the quantum scattering process is obtained for such systems. Then, using partial wave analysis, we introduce a new form of entanglement fidelity considering the effect of high-intensity laser beam fields. The effective potential of hot quantum plasma including plasmon and quantum screening effects is used to obtain the entanglement fidelity ratio as a function of the laser amplitude, and plasmon and Debye length parameters for the elastic electron-ion collisions. It is shown that the plasma free electrons oscillations under interaction with laser beam fields improve the correlations between charged particles and consequently lead to the increase in the system entanglement.
