Decoherence of a Superposition of Macroscopic Current States in a SQUID

Details Decoherence of a Superposition of Macroscopic Current States in a SQUID Decoherence of a Superposition of Macroscopic Current States in a SQUID

2002-11-13

arxiv.org/abs/cond-mat/0211246v1

Phys. Rev. B, 67 (2003) 064515

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.67.064515

We show that fundamental conservation laws mandate parameter-free mechanisms of decoherence of quantum oscillations of the superconducting current between opposite directions in a SQUID -- emission of phonons and photons at the oscillation frequency. The corresponding rates are computed and compared with experimental findings. The decohering effects of external mechanical and magnetic noise are investigated.

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