Tunable pulse delay and advancement device based on a cavity electromechanical system

摘要

We theoretically study the transmission of a weak probe field under the influence of a strong pump field in a coupled nanomechanical resonator-superconducting microwave cavity system. Using the standard input-output theory, we find that both pulse delay (slow-light effect) and advancement (fast-light effect) of the probe field can appear in this coupled system provided that we choose a suitable detuning of the pump field from cavity resonance. The magnitude of the delay (advancement) can be tuned continuously by adjusting the power of the pump field. This technique demonstrates great potential in applications including microwave phase shifter and delay line.