论文标题
超长耦合方案中非对角线旋转玻色子模型的相干动力学
Coherent Dynamics of the Off-Diagonal Spin-Boson Model in the Ultra-Strong Coupling Regime
论文作者
论文摘要
量子力学描述了封闭系统的统一时间演变。实际上，每个量子系统都与环境相互作用，从而导致不可逆转的连贯性丧失。自旋 - 玻色子模型（SBM）对于理解与骨气热浴相互作用的两态量子系统的基本过程是核心，但是在存在混合对角线和野外系统托架的情况下，瞬态动力学的性质仍然很大程度上尚未得到解释。在这里，我们调查了欧姆环境的混合系统养空相互作用如何诱导无偏置SBM中的定位。对于与环境的强耦合，通过隧道幅度的重新归一化的动态产生的偏差，本地化受到强烈的影响。我们发现，哈密顿参数对非指数短时动力学和长期种群平衡的反活性影响可以导致时间尺度和非平衡量子相干动力学的分离，这些动力也可以持续使用超强系统 - 系统 - 系统 - 系统策略的相互作用。这些发现提供了新的机会，可以利用连贯性作为在超强耦合制度中运行的量子设备中的资源。
Quantum mechanics describes the unitary time evolution of closed systems. In practice, every quantum system interacts with the environment leading to an irreversible loss of coherence. The Spin-Boson model (SBM) is central to the understanding of the fundamental process of decoherence of a two-state quantum system interacting with a bosonic heat bath but the nature of transient dynamics in the presence of hybrid diagonal and off-diagonal system-bath interactions remains largely unexplored. Here, we investigate how the hybrid system-bath interactions of an Ohmic environment induce localization in the bias-free SBM. For strong coupling to the environment, localization is strongly affected by a dynamically generated bias via the renormalization of the tunneling amplitude. We find that counteractive effects of Hamiltonian parameters on non-exponential short-time dynamics and long-time population equilibration can lead to a separation of timescales and non-equilibrium quantum coherent dynamics that can persist even for ultra-strong system-bath interaction. The findings offer novel opportunities to exploit coherence as a resource in quantum devices operating in the ultra-strong coupling regime.
