Landau-Zener-St\"uckelberg interference in a multimode electromechanical system in the quantum regime

TL;DR

This paper demonstrates Landau-Zener-St"uckelberg interference in a quantum multimode electromechanical system, revealing how a superconducting qubit interacts with multiple acoustic modes, advancing control over hybrid quantum systems.

Contribution

It introduces experimental observation of LZS interference involving a qubit coupled to many mechanical modes in the quantum regime, a novel multimode quantum control approach.

Findings

Demonstrated LZS interference with multiple acoustic modes

Achieved quantum regime coupling between qubit and mechanical oscillators

Showed potential for controlling multiple modes via parametric modulation

Abstract

The studies of mechanical resonators in the quantum regime not only provide insight into the fundamental nature of quantum mechanics of massive objects, but also introduce promising platforms for novel hybrid quantum technologies. Here we demonstrate a configurable interaction between a superconducting qubit and many acoustic modes in the quantum regime. Specifically, we show how consecutive Landau-Zener-St\"uckelberg (LZS) tunneling type of transitions, which take place when a system is tuned through an avoided crossing of the coupled energy levels, interfere in a multimode system. The work progresses experimental LZS interference to cover situations where the coupled levels are those of a qubit interacting with a multitude of mechanical oscillators in the quantum limit. The work opens up applications in controlling multiple acoustic modes via parametric modulation.