Tunable non-Markovian and quantum coherence in the single-qubit dephasing noise channel  

作　　者：Na-Na Zhang Chao-Yi Wu Xu Zhou Qi-Yuan Liu Cheng-Ge Liu Yong-Rui Guo Ren-Pu Li 

机构地区：[1]School of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing,400065,China [2]Department of Physics,Applied Optics Beijing Area Major Laboratory,Beijing Normal University,Beijing,100875,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2025年第3期92-101,共10页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJQN202200603);the National Natural Science Foundation of China(Grant No.62205042);the Program for the Innovative Talents of Postdoctor of Chongqing(Grant No.2209013344731596);the Chongqing University of Posts and Telecommunications(Grant Nos.A2022-304,A2022-288,and A2024196)。

摘　　要：In this paper,we construct a single-qubit dephasing noise channel based on the nuclear magnetic resonance(NMR)system by employing the bath-engineering technology,and achieve the construction of the tunable non-Markovian environment in the dephasing noise channel.Our findings indicate that for the single-qubit system,the transition of system dynamics from Markovian to non-Markovian can be achieved by adjusting the base frequency of the noise power spectrum.However,the base frequency corresponding to this phase transition point is not fixed,and there is a certain relationship between it and the total evolution time of the single-qubit system.Through our research,we discovered a fundamental relationship:if the single-qubit system dynamics undergoe a transition from Markovian to non-Markovian atω_(0) within 0-2t ms,shortening the evolution time to 0-t ms results in an increase of the phase transition point to 2ω_(0).This insight offers crucial guidance for artificially crafting non-Markovian environments across arbitrary time scales in single-qubit systems,and it is not limited by the type of noise.Apart from system dynamics,quantum coherence is also a focal point of our research.We find that when the system dynamics exhibit non-Markovian behavior,the quantum coherence of the single-qubit system experiences revivals.Notably,the timing of these coherence revivals aligns with the instants of the non-Markovianity enhancement.Therefore,our research also serves as a pivotal foundation for the artificial manipulation and realization of quantum coherence revivals within diverse single-qubit systems.

关 键 词：dephasing noise channel NON-MARKOVIAN quantum coherence 

分 类 号：O41[理学—理论物理]