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We study decoherence in a circuit QED system consisting of a charge qubit andtwo superconducting transmission line resonators (TLRs). We show that in thedispersive regime of the circuit QED system one TLR can be used as an auxiliarysubsystem to realize decoherence-free quantum dynamics of the bipartite targetsystem consisting of the charge qubit and the other TLR conditioned on theauxiliary TLR initially being a proper number state. Our study gives newinsight into control and manipulation of decoherence in quantum systems.

Decoherence-free quantum dynamics in circuit QED system