自旋链通道中介观回波的消相干衰减
Decoherence as attenuation of mesoscopic echoes in a spin-chain channel
摘要：
受限量子系统中的初始局域激发演化为探索整个系统，在海森堡时间作为介观回声返回到初始位置。我们考虑两个弱耦合的自旋链，一个自旋梯，其中一个是量子信道，而另一个代表一个环境。我们通过介观回波的衰减来量化量子信道中的退相干。我们评估退相干率的不同比例之间的振幅波动和退相的链间相互作用的哈密顿量的来源。多体动力学被看作是一个具有费米黄金法则给出的退相干率的单体演化。
英文摘要：
An initial local excitation in a confined quantum system evolves exploring the whole system, returning to the initial position as a mesoscopic echo at the Heisenberg time. We consider a two weakly coupled spin chains, a spin ladder, where one is a quantum channel while the other represents an environment. We quantify decoherence in the quantum channel through the attenuation of the mesoscopic echoes. We evaluate decoherence rates for different ratios between sources of amplitude fluctuation and dephasing in the inter-chain interaction Hamiltonian. The many-body dynamics is seen as a one-body evolution with a decoherence rate given by the Fermi golden rule.
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