Quantum beats of a magnetic fluxon in a two-cell SQUID
I. N. Moskalenko, I. S. Besedin, S. S. Seidov, M. V. Fistul, A. V., Ustinov
TL;DR
This paper presents a theoretical analysis of quantum beats in a two-cell SQUID caused by a magnetic fluxon, including energy level calculations and implications for experimental detection.
Contribution
It provides a detailed theoretical framework for understanding quantum beats of a fluxon in a high inductance SQUID, including analytical and numerical energy level analysis.
Findings
Energy levels depend on external magnetic fields
Quantum tunneling causes observable quantum beats
Proposed experimental setup for measuring quantum beats
Abstract
We report a detailed theoretical study of a coherent macroscopic quantum-mechanical phenomenon - quantum beats of a single magnetic fluxon trapped in a two-cell SQUID of high kinetic inductance. We calculate numerically and analytically the low-lying energy levels of the fluxon, and explore their dependence on externally applied magnetic fields. The quantum dynamics of the fluxon shows quantum beats originating from its coherent quantum tunneling between the SQUID cells. We analyze the experimental setup based on a three-cell SQUID, allowing for time-resolved measurements of quantum beats of the fluxon.
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