非马尔科夫环境中各向异性海森堡自旋链在磁场作用下的量子稠密编码  

Quantum Dense Encoding of Anisotropic Heisenberg Spin Chain under Magnetic Field in Non-Markov Environment

作　　者：唐诗生 张金峰 艾克拜尔·斯地木 艾合买提·阿不力孜[1] TANG Shi-sheng;ZHANG Jin-feng;Akbar;Abunizi·Ahmat(Institute of Physics and Electronic Engineering,Xinjiang Normal University,Xinyi Road 102,Urumqi 830054,China)

机构地区：[1]新疆师范大学物理与电子工程学院,乌鲁木齐830054

出　　处：《量子光学学报》2021年第1期45-53,共9页Journal of Quantum Optics

基　　金：国家自然科学基金(11864042)。

摘　　要：本文主要研究了在非马尔可夫环境下在时变磁场中具有各种参数的交互作用非常丰富的两个比特的海森堡XYZ模型的量子稠密编码的性质。通过量子态扩散方法Quantum State Diffusion Method(QSD)模拟了信道容量χ随时间的演化关系。经过数值模拟显示:量子稠密编码对环境关联系数γ、耦合系数J和Jz以及余弦磁场的强度B都有依赖。当环境关联系数γ变小时也就是非马尔科夫特性增加时,量子稠密编码的信道容量χ明显呈现上升趋势。在这里值得提出的是较小的耦合系数Jz、较大的耦合系数J、和较强的时变磁场强度B对于在本系统下进行有效的量子稠密编码是非常有用的,其中在非马尔科夫情形下非常明显,这对能够有效地进行信息传输非常的重要。Quantum dense coding property of Heisenberg XYZ model with abundant interaction of various parameters in a time-varying magnetic field is studied in this paper. The evolution of channel capacity χ over time is simulated by Quantum State Diffusion Method(QSD). Numerical simulation shows that quantum dense coding depends on the environmental correlation coefficient γ, coupling coefficient J,Jz and the intensity B of cosine magnetic field. When the environment correlation coefficient γ variable small, that is, the non-Markov characteristic increases, the channel capacity χ of quantum dense coding obviously increases. Here it is worthwhile to propose that smaller coupling coefficients Jz, larger coupling coefficients J, and stronger time-varying magnetic field intensities B all are very useful for efficient quantum dense coding in this system, where it is very obvious in the case of non-markov, which is in turn very important for efficient information transmission.

关 键 词：非马尔可夫环境 量子稠密编码 QSD方法 

分 类 号：O413[理学—理论物理]