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本文将电路理论中的网孔分析法与递归变换法相结合,给出了一种求解蝶形电阻网络圆周边界任意端口间等效电阻的简捷方法.计算过程中,首先基于网孔分析法建立了非线性的差分方程组,随后利用矩阵变换方法,将非线性差分方程组转化为线性的差分方程组.此外,本文将一般外加单一电流源求等效电阻的策略推广为外加多个电流源,由此获得的等效电阻解析表达式可适用于计算任意端口的等效电阻. 相似文献
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Comparison and control of the robustness between quantum entanglement and quantum correlation in an open quantum system 下载免费PDF全文
We investigate the influence of environmental decoherence on the dynamics of a coupled qubit system and quantum correlation.We analyse the relationship between concurrence and the degree of initial entanglement or the purity of initial quantum state,and also their relationship with quantum discord.The results show that the decrease of the purity of an initial quantum state can induce the attenuation of concurrence or quantum discord,but the attenuation of quantum discord is obviously slower than the concurrence’s,correspondingly the survival time of quantum discord is longer.Further investigation reveals that the robustness of quantum discord and concurrence relies on the entanglement degree of the initial quantum state.The higher the degree of entanglement,the more robust the quantum discord is than concurrence.And the reverse is equally true.Birth and death happen to quantum discord periodically and a newborn quantum discord comes into being under a certain condition,so does the concurrence. 相似文献
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Controlling of entropic uncertainty in open quantum system via proper placement of quantum register 下载免费PDF全文
We investigate the dynamical behaviors of quantum-memory-assisted entropic uncertainty and its lower bound in the amplitude-damping channel. The influences of different placement positions of the quantum register on the dynamics of quantum coherence, quantum entanglement, and quantum discord are analyzed in detail. The numerical simulation results show that the quantum register should be placed in the channel of the non-Markovian effect. This option is beneficial to reduce the entropic uncertainty and its lower bound. We also find that this choice does not change the evolution of the quantum coherence and quantum entanglement, but changes the dynamical process of the quantum discord of the system.These results show that quantum coherence, quantum entanglement, and quantum discord are different quantum resources with unique characteristics and properties, and quantum discord can play a key role in reducing the uncertainty of quantum systems. 相似文献
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考虑电子与声子间相互作用,研究了两种声子库纯初始态(正则系综与粒子数态)下耗散介观电路的动力学特性.长时间极限下(t→∞):当环境处于热平衡态时,电路系统中的电流和电荷的平均值只与电路所处初始量子态中的平均值有关,与环境无关;环境初态为粒子数态时,电荷与电流平均值随时间的演化特性与环境初始处于热平衡态下时完全一样,表明介观电路中的电荷与电流的平均值与环境量子态的某组占有数无关.电路中电流和电荷的量子涨落不仅与系统的初态有关,还与系统所处环境的量子态及温度有关.一般地说,电路系统与环境的纠缠会
关键词:
介观耗散电路
声子库
量子初态
量子态纯度 相似文献
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本文将线性空间的不动点理论与施加双外加电流注源法相结合,在探索研究网孔电流的递归表达式的基础上,给出了一种求Z×N级梯形电阻网络输入端任意两节点间等效电阻的简捷计算方法.该计算方法对计算平面电阻网络的等效电阻不仅有通用性,而且更加方便灵活. 相似文献
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