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Paper IPM / P / 14940  


Abstract:  
We study the dynamics of a macroscopic superconducting qubit coupled to two independent nonstationary reservoirs by using timedependent perturbation theory. Our results show that a single equilibrium environment surpasses completely the coherent evolution of the macroscopic qubit. When the qubit couples to two different reservoirs, exemplifying a nonequilibrium environment, the shorttime dynamics is affected by the interference between two reservoirs, implying the nonadditivity of effects of two reservoirs. The nonadditivity can be traced back to a nonMarkovian effect, even though two reservoirs are independently assumed to be Markovian. Explicitly, the nonequilibrium environment intensifies both coherent and incoherent parts of the evolution. Therefore, the macroscopic system would evolve more coherently but at the price of a shorter decoherence time.
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