arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.3926quant-ph
收藏

不同有效谱密度函数下自旋玻色子系统的时间演化

Time evolution of spin-boson system for different effective spectral density functions

Xian-Ting Liang

摘要:

本文首先通过设定熔池的截止频率为无穷大和有限大,得到了两种有效谱密度函数。其次,我们研究了四类由基本自旋玻色子模型构造的系统中开量子比特的约化动力学。结果表明,量子比特具有不同的动力学控制的两种谱密度函数。此外,我们还得到了耦合到中间谐振子的量子比特在耦合到同一个浴槽时比耦合到各自的浴槽时具有更长的退相干和弛豫时间。在求解量子比特的动力学问题时,我们采用了一种数值精确算法,即基于准绝热传播子路径积分方案的迭代张量乘算法。

英文摘要:

In this paper we firstly obtain two kinds of effective spectral density functions by setting the cut-off frequencies of baths be infinite and finite. Secondly, we investigate the reduced dynamics of open qubits in four kinds of systems constructed with the basic spin-boson model. It is shown that the qubit has different dynamics governed by the two kinds of spectral density functions. In addition, we obtained that a qubit coupled to an intermediate harmonic oscillator has longer decoherence and relaxation times as they are coupled to a common bath than to their respective baths. In solving the dynamics of qubits we use a numerically exact algorithm, iterative tensor multiplication algorithm based on the quasiadiabatic propagator path integral scheme.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑