Spin bath-mediated decoherence in superconductors

Details Spin bath-mediated decoherence in superconductors Spin bath-mediated decoherence in superconductors

2000-06-04

arxiv.org/abs/cond-mat/0006054v1

Physics

Condensed Matter

5 pages, LaTex, 3 figures, submitted to PRL in May, 2000

Scientific paper

We consider a SQUID tunneling between 2 nearly degenerate flux states. Decoherence caused by paramagnetic and nuclear spins in the low-$T$ limit is shown to be much stronger than that from electronic excitations. The decoherence time $\tau_{\phi}$ is determined by the linewidth $E_o$ of spin bath states, which can be reduced by a correct choice of ring geometry and isotopic purification. $E_o$ can be measured in either field sweep or microwave absorption experiments, allowing both a test of the theory and design control.

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