Decoherence in a superconducting ring

Details Decoherence in a superconducting ring Decoherence in a superconducting ring

2000-10-19

arxiv.org/abs/quant-ph/0010072v2

Physics

Quantum Physics

13 pages, revtex, 1 figure; corrected calculation for low frequencies

Scientific paper

A superconducting ring has different sectors of states corresponding to different values of the trapped magnetic flux; this multitude of states can be used for quantum information storage. If a current supporting a nonzero flux is set up in the ring, fluctuations of electromagnetic field will be able to ``detect'' that current and thus cause a loss of quantum coherence. We estimate the decoherence exponent for a ring of a round type-II wire and find that it contains a macroscopic suppression factor $(\delta / R_{1})^{2}$, where $R_{1}$ is the radius of the wire, and $\delta$ is the London penetration depth. We present some encouraging numerical estimates based on this result.

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