Wang Lu, Zheng Fulu, Wang Jiaming, Großmann Frank, Zhao Yang
School of Science, Inner Mongolia University of Science and Technology, Inner Mongolia 014010, China.
Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany.
J Phys Chem B. 2021 Apr 1;125(12):3184-3196. doi: 10.1021/acs.jpcb.1c00887. Epub 2021 Mar 19.
Employing the time-dependent variational principle combined with the multiple Davydov D Ansatz, we investigate Landau-Zener (LZ) transitions in a qubit coupled to a photon mode with various initial photon states at zero temperature. Thanks to the multiple Davydov trial states, exact photonic dynamics taking place in the course of the LZ transition is also studied efficiently. With the qubit driven by a linear external field and the photon mode initialized with Schrödinger-cat states, asymptotic behavior of the transition probability beyond the rotating-wave approximation is uncovered for a variety of initial states. Using a sinusoidal external driving field, we also explore the photon-assisted dynamics of Landau-Zener-Stückelberg-Majorana interferometry. Transition pathways involving multiple energy levels are unveiled by analyzing the photon dynamics.
采用含时变分原理并结合多重达维多夫D假设，我们研究了在零温度下与具有各种初始光子态的光子模式耦合的量子比特中的朗道 - 齐纳（LZ）跃迁。得益于多重达维多夫试探态，在LZ跃迁过程中发生的精确光子动力学也得到了有效研究。对于由线性外场驱动的量子比特以及用薛定谔猫态初始化的光子模式，针对各种初始态揭示了超越旋转波近似的跃迁概率的渐近行为。使用正弦外驱动场，我们还探索了朗道 - 齐纳 - 施图克尔贝格 - 马约拉纳干涉测量的光子辅助动力学。通过分析光子动力学揭示了涉及多个能级的跃迁路径。
