We study decoherence in a circuit QED system consisting of a charge qubit and two superconducting transmission line resonators (TLRs). We show that in the dispersive regime of the circuit QED system one TLR can be used as an auxiliary subsystem to realize decoherence-free quantum dynamics of the bipartite target system consisting of the charge qubit and the other TLR conditioned on the auxiliary TLR initially being a proper number state. Our study gives new insight into control and manipulation of decoherence in quantum systems.
@article{arxiv.0903.1774,
title = {Decoherence-free quantum dynamics in circuit QED system},
author = {Ping Liao and Qin-Qin Wu and Jie-Qiao Liao and Le-Man Kuang},
journal= {arXiv preprint arXiv:0903.1774},
year = {2009}
}