Decoherence of a Superposition of Macroscopic Current States in a SQUID
classification
❄️ cond-mat.mes-hall
cond-mat.supr-con
keywords
currentdecoherencesquidcomparedcomputedconservationcorrespondingdecohering
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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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