Quantum Discord Behavior about Two-Qubit Heisenberg XYZ Model with Decoherence

We investigate the properties of quantum discord dynamics of a two-qubit Heisenberg XYZ system which is influenced by the environmental decoherence under an external nonuniform magnetic field. It shows that the influence of the parameters on the system heavily rely on the selection of the initial states. One point shows that the environmental decoherence cannot entirely destroy the quantum correlation, and properly controlling the parameters can inhibit the decoherence. Moreover, it presents that the inhomogeneous magnetic field cannot affect the steady quantum discord （QD）, while the uniform magnetic field and the anisotropy coupling constant will change the steady QD. These investigations imply that one can obtain larger steady QD values by reasonably adjusting parameters on quantum correlation in solid state systems.     

Dynamics of quantum discord in a two-qubit system under classical noise

We study the quantum discord dynamics of two noninteracting qubits that are, respectively, subject to classical noise. The results show that the dynamics of quantum discord are dependent on both the coupling between the qubits and classical noise, and the average switching rate of the classical noise. In the weak-coupling Markovian region, quantum discord exhibits exponent decay without revival, and can be well protected by increasing the average classical noise switching rate. While in the strong-coupling non-Markovian region, quantum discord reveals slowly decayed oscillations with quick revival by decreasing the average switching rate of the classical noise. Thus, our results provide a new method of protecting quantum discord in a two-qubit system by controlling the coupling between the qubits and classical noise, and the average switching rate of the classical noise.     

因子分析法在中国乡镇企业发展评价中的应用

乡镇企业与区域经济发展的不和谐是造成中国区域经济发展不平衡的重要原因。本文基于《农业统计年鉴》(2006)的数据,采用因子分析法对中国30个省市的乡镇企业经济发展情况进行了统计排序,并结合区域总体经济实力予以比较。分析结果显示,各地区乡镇企业经济的发展存在不均衡性;区域内部乡镇企业经济与区域总体经济实力之间存在不协调性;中国乡镇企业经济发展与区域总体经济发展之间呈现不和谐特征。     

Mathematical basis of idea that harmonious marriage can lengthen life-span

It is a very important issue for us to explore the effects of the marriage to life. In recent years, many scholars have proved that the marriage can lengthen life-span from different angles. With the development of theory of dependence random variables, we discuss the effects of the marriage to life and provide a mathematical basis of the idea that the harmonious marriage can lengthen life-span in this paper. Meanwhile, we analyze the impact of the marriage on life on the basis of the net single premium.     

物理之美与美的物理教学

 众所周知,物理教学从来不是单一的抽象思维活动,在教学中师生的交流不应仅仅是作为知识概念的交流,还应该是心灵和感情的交流,即“真善美”的绕一,因此,物理教学必须站在更广阔的知识背景上,挖掘教材中的美的因素,运用美学知识,激发学生的求知欲,增强学生的想象力和洞察力。所以物理教学中讲究美是为学生创造接受知识的条件,是提高学习效率的重要手段。物理之美和美的物理教学,可以培养学生的美学素养,使学生在更高的审美情趣中认识美的世界,创造美的未来。 一、科学家对现代物理学之美的追求 物理学史告诉我们,近代物理学是随着文艺复兴运动的兴起而兴起的。文艺复兴运动也使得希腊的科学美学思想在欧洲复活,唤醒了一大批自然科学家。     

同构函数中的数学之美--2022年新高考Ⅰ卷数学22题赏析

2022新高考Ⅰ卷数学22题很好地体现了数学文化和数学涵养,甚至于体现出哲学观.该题将具有和谐统一美的导函数与数列结合到了一起,本文再对其进行变式,以期产生更多的和谐与统一.     

Quantum Discord in Two-Qubit System Constructed from the Yang–Baxter Equation

Quantum correlations among parts of a composite quantum system are a fundamental resource for several applications in quantum information. In general, quantum discord can measure quantum correlations. In that way, we investigate the quantum discord of the two-qubit system constructed from the Yang-Baxter Equation. The density matrix of this system is generated through the unitary Yang-Baxter matrix R. The analytical expression and numerical result of quantum discord and geometric measure of quantum discord are obtained for the Yang-Baxter system. These results show that quantum discord and geometric measure of quantum discord are only connect with the parameter θ, which is the important spectral parameter in Yang Baxter equation.     

和谐效率理念融入大学化学理论教学的探索

针对工农业生产、日常生活对环境的影响,结合科技前沿,将和谐、效率理念渗透到大学化学相关章节的理论教学中。这既有利于学生对化学知识的掌握和对和谐、效率理念的理解,也能扩大学生的视野,从而促使学生自觉地以实际行动去关心和保护环境,形成科学的生产和生活意识。     

抓住机遇、迎接挑战、求真务实、和谐发展——计算物理学会第五届理事会工作报告

各位代表:赵宪庚理事长因参加中国共产党第十七次全国代表大会,不能与会。我受他的委托,向大会作第五届理事会的工作报告,提请代表们审议。在十七大召开之日,迎来了计算物理学会第六届年会暨庆祝学会成立25周年学术交流会的召开,这是我国计算物理工作者的一件大喜事。计算物理学会是我国计算物理工作者学术性的群众团体。其任务是组织和团结全国计算物理工作者,积极开展学术交流活动,推动计算物理学科的发展,为我国科学技术进步、经济建设和国防建设做贡献。从2002年8月7日第五届年会闭幕,至今日,2007年10月15日第六届年会开幕为止,本届理事…