An Off-Resonant Quantum Collision Model:Realizing a Qubit Coupled with an Effective Negative-Temperature Bath  

作　　者：Wei-Bin Yan Zhong-Xiao Man Ying-Jie Zhang Yun-Jie Xia 闫伟斌;满忠晓;张英杰;夏云杰(College of Physics and Engineering,Qufu Normal University,Qufu 273165,China)

机构地区：[1]College of Physics and Engineering,Qufu Normal University,Qufu 273165,China

出　　处：《Chinese Physics Letters》2025年第1期15-22,共8页中国物理快报(英文版)

基　　金：supported by the Taishan Scholar Project of Shandong Province(Grant No.tsqn201812059);the National Natural Science Foundation of China(Grant Nos.11505023,11974209,and 12274257)。

摘　　要：The quantum collision model provides a promising tool for investigating system-bath dynamics.Most studies of quantum collision models,however,are in the resonant regime.In quantum dynamics,the off-resonant interactions often result in exciting effects.Therefore,it is important to investigate the quantum collision models in the off-resonant regime.A bath with a negative absolute temperature is expected to be instrumental in the development of thermal devices.The design of an effective bath with negative absolute temperature coupled to a qubit is a significant component for developing such thermal devices.In this study,we establish an effective negative-absolute-temperature bath coupled to a qubit with a quantum collision model in the far-off-resonant regime.We conduct a detailed systematic investigation of the off-resonant collision model and determine the presence of an additional constraint on the collision duration resulting from the far-off resonant collision.The dynamics of the collision model in the far-off-resonant regime are different from those beyond the far-off-resonant regime.Numerical simulations are used to confirm the validity of the proposed approach.

关 键 词：dynamics. RESONANT COLLISION 

分 类 号：O413[理学—理论物理]