Decoherence of a superposition of macroscopic current states in a SQUID
E. M. Chudnovsky, A. B. Kuklov
DOI 10.1103/PhysRevB.67.064515 · Physical Review B
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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 superconducting quantum interference device—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 noises are investigated.
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