Quantum Dynamics and Entropy in a Single-Cooper-Pair Box with a Single-Mode Cavity Field
Meng Zhang, Jian Zou, Bin Shao · International Journal of Modern Physics B · 2003
We consider a single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field. We assume that the box is initially in a mixed state, and investigate the quantum dynamics of the Cooper-pair box and show that the collapse and revival phenomenon can exist in this system. We also study the quantum entropy of the single-Cooper-pair box and discuss the effects of the different parameters on this quantum entropy. We find that the box, which is initially in a mixed state, may evolve into an almost pure state.