EVOLUTION OF QUANTUM FLUCTUATIONS OF A OVER-DAMPED MESOSCOPIC CIRCUIT AT FINITE TEMPERATURE
Juju Hu, Qiang Ke, Yinghua Ji · International Journal of Modern Physics B · 2007
Time evolution of quantum fluctuations is investigated for an over-damped mesoscopic circuit with the help of the quantum characteristic function. It is found that, for an initial squeezed state, the quantum fluctuations of charge and current evolve with time by hyperbolic functions, and relate not only with the circuit parameters, but also the squeezing parameter. It is also found that with other conditions invariant to reducing the quantum fluctuations of charge and current, we should reduce the squeezing amplitude parameter. The research will be helpful in miniaturizing integrated circuits and electric components. It will also be significant for the further study of quantum information.