Short-time decoherence of Josephson charge qubit nonlinearly coupling with its environment

Details Short-time decoherence of Josephson charge qubit nonlinearly coupling with its environment Short-time decoherence of Josephson charge qubit nonlinearly coupling with its environment

2004-09-16

arxiv.org/abs/quant-ph/0409102v2

Physics Letters A 332 (2004) 8-16

Physics

Quantum Physics

11 pages, 4 figures

Scientific paper

10.1016/j.physleta.2004.09.053

At first, we generally investigate the short-time decoherence of a qubit nonlinearly coupling with a bath. The measure of the decoherence is chosen as the maximum norm of the deviation density operator. Then we concretely investigate the Josephson charge qubit (JCQ) model. It is shown that at the temperature T=30mK, the loss of fidelity (due to decoherence) of the JCQ is bigger than the DiVincenzo low decoherence criterion. The decoherence will decrease with the decrease of the experimental temperature. When the temperature decreases to T=0.3mK the DiVincenzo low decoherence criterion can be satisfied.

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