自旋链中局域退散过程信号的遥测
Remotely detecting the signal of a local decohering process in spin chains
摘要：
研究了一维量子自旋链从非纠缠态和纠缠态演化的动力学。在给定的时刻，量子动力学过程（例如，测量）在链的一端处的单次自旋上执行，从而使系统散肩。通过进一步的幺正演化，信号在自旋链中传播，这可以在稍后的时间从不同自旋上的测量中检测到。从从历元时间的退相干态的动力学幺正演化，可以检测到动力学过程的发生。传播的动力学过程中的信号，和速度的信号进行了调查，为各种自旋模型，即。使用伊辛，海森堡，和横向XY动力学。
英文摘要：
We study the dynamics of a one dimensional quantum spin chain evolving from unentangled or entangled initial state. At a given instant of time a quantum dynamical process (ex. measurement) is performed on a single spin at one end of the chain, decohering the system. Through the further unitary evolution, a signal propagates in the spin chain, which can be detected from a measurement on a different spin at later times. From the dynamical unitary evolution of the decohered state from the epoch time, it is possible to detect the occurrence of the dynamical process. The propagation of the signal for the dynamical process, and the speed of the signal are investigated for various spin models, viz. using the Ising, Heisenberg, and the transverse-XY dynamics.
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