Play building blocks on population distribution of multilevel superconducting flux qubit with quantum interference

TL;DR

This paper extends a rate equation method to analyze Landau-Zener interference in multilevel superconducting flux qubits under larger driving amplitudes and frequencies, revealing new anomalous behaviors consistent with recent experimental observations.

Contribution

It introduces an extended theoretical approach to study high-amplitude, high-frequency effects in multilevel flux qubits, uncovering novel interference phenomena.

Findings

Identification of anomalous interference characteristics at high driving amplitudes and frequencies

Theoretical results align with recent experimental observations

Enhanced understanding of quantum interference in superconducting qubits

Abstract

Recent experiments on Landau-Zener interference in multilevel superconducting flux qubits revealed various interesting characteristics, which have been studied theoretically in our recent work by simply using rate equation method [PRB 79, 094529, (2009)]. In this note we extend this method to the same system but with larger driving amplitude and higher driving frequency. The results show various anomalous characteristics, some of which have been observed in a recent work.