Decoherence of a Superposition of Macroscopic Current States in a SQUID
E. M. Chudnovsky, A. B. Kuklov
TL;DR
This paper demonstrates that fundamental conservation laws inherently cause decoherence in a SQUID's superposition states through phonon and photon emission, with rates matching experimental data, and also examines external noise effects.
Contribution
It introduces a parameter-free mechanism of decoherence based on conservation laws and calculates associated rates, aligning them with experimental observations.
Findings
Decoherence rates due to phonon and photon emission match experimental data.
External mechanical and magnetic noise also contribute to decoherence.
Fundamental laws impose intrinsic limits on quantum coherence in SQUIDs.
Abstract
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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