Short-time decoherence of Josephson charge qubits

Details Short-time decoherence of Josephson charge qubits Short-time decoherence of Josephson charge qubits

2004-05-31

arxiv.org/abs/quant-ph/0405188v4

Physica B 362 (2005) 243-248

Physics

Quantum Physics

5pages 2figures

Scientific paper

10.1016/j.physb.2005.02.016

In this paper we investigate the short-time decoherence of single Josephson charge qubit (JCQ). The measure of decoherence is chosen as the maximum norm of the deviation density operator. It is shown that when the temperature low enough (for example T=30mK), within the elementary gate-operation time tau{g}~12.7ps, the decoherence is smaller than 0.0001 at present setup of JCQ. The Josephson charge qubit is suitable to take the blocks for quantum computations according to the DiVincenzo low decoherence criterion.

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