Decoherence in a superconducting quantum bit circuit

Details Decoherence in a superconducting quantum bit circuit Decoherence in a superconducting quantum bit circuit

2005-08-24

arxiv.org/abs/cond-mat/0508588v1

Physics

Condensed Matter

Superconductivity

Long paper. 65 pages, 18 Figures

Scientific paper

Decoherence in quantum bit circuits is presently a major limitation to their use for quantum computing purposes. We present experiments, inspired from NMR, that characterise decoherence in a particular superconducting quantum bit circuit, the quantronium. We introduce a general framework for the analysis of decoherence, based on the spectral densities of the noise sources coupled to the qubit. Analysis of our measurements within this framework indicates a simple model for the noise sources acting on the qubit. We discuss various methods to fight decoherence.

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