Decoherence Dynamics in a Polaron System with Collective Dephasing

IF 1.3 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
Saima Bashir, Muzaffar Qadir Lone, Prince A Ganai
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引用次数: 0

Abstract

Within quantum information frameworks, managing decoherence stands as a pivotal task. The present work delves into decoherence dynamics of a dressed qubit, represented by a spinless fermion hopping between two lattice sites that are strongly coupled to a collective bosonic bath. To simplify calculations under strong coupling, we adopt the Lang-Firsov transformation, effectively minimizing system-bath interactions. Within the polaron perspective using Ohmic bath spectral density with a Gaussian cutoff, we identify a fundamental timescale s (equivalently a length scale l), dictating coherence decay. Utilizing a quantum master equation in the energy eigen basis while maintaining fixed particle number, we demonstrate that coherence persists for small s values but diminishes for larger ones. Additionally, we explore the utilization of \(\pi \)-pulses to manipulate decoherence within the system.

具有集体消相的极化子系统的退相干动力学
在量子信息框架中,管理退相干是一项关键任务。目前的工作深入研究了一个修饰量子比特的退相干动力学,由一个在两个晶格点之间跳跃的无自旋费米子表示,这两个晶格点与集体玻色子浴强耦合。为了简化强耦合下的计算,我们采用了Lang-Firsov变换,有效地减少了系统间的相互作用。在极化子的角度使用欧姆浴光谱密度与高斯截止,我们确定了一个基本的时间尺度s(相当于长度尺度l),决定相干衰减。在保持固定粒子数的情况下,利用能量本征基中的量子主方程,我们证明了小s值的相干性持续存在,而大s值的相干性减弱。此外,我们探索利用\(\pi \) -脉冲来操纵系统内的退相干。
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来源期刊
CiteScore
2.50
自引率
21.40%
发文量
258
审稿时长
3.3 months
期刊介绍: International Journal of Theoretical Physics publishes original research and reviews in theoretical physics and neighboring fields. Dedicated to the unification of the latest physics research, this journal seeks to map the direction of future research by original work in traditional physics like general relativity, quantum theory with relativistic quantum field theory,as used in particle physics, and by fresh inquiry into quantum measurement theory, and other similarly fundamental areas, e.g. quantum geometry and quantum logic, etc.
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