Abstract

We investigate the quantum evolution speed of a qubit in two kinds of finite-temperature environments. For the first bosonic bath with an ohmic-like spectrum, the high temperature leads to not only the speed-up but also speed-down processes in the weak-coupling regime, which is different from the strong-coupling case, in which only the speed-up process is exhibited. Furthermore, we realize the controllable and stationary quantum evolution speed by applying the bang-bang pulse. For the second nonlinear bath, we study the quantum evolution speed by resorting to the hierarchical equations of a motion method beyond the Born–Markov approximation. It is shown that the quantum evolution speed can be decelerated by the rise of temperature in the strong-coupling regime, which is an anomalous phenomenon and contrary to the common recognition that quantum evolution speed always increases with the temperature.

© 2018 Optical Society of America

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