Coupling high-overtone bulk acoustic wave resonators via superconducting qubits

TL;DR

This paper demonstrates coupling between high-overtone bulk acoustic wave resonators via superconducting transmon qubits, enabling quantum state transfer between acoustic modes, advancing quantum acoustics and hybrid quantum systems.

Contribution

It introduces a novel device architecture coupling multiple acoustic resonators through superconducting qubits, showcasing multimode interactions and quantum state transfer capabilities.

Findings

Demonstrated qubit-qubit interaction in a multimode acoustic system

Achieved quantum state transfer between acoustic modes of different resonators

Showed the feasibility of coupling high-overtone bulk acoustic resonators via superconducting qubits

Abstract

In this work, we present a device consisting of two coupled transmon qubits, each of which are coupled to an independent high-overtone bulk acoustic wave resonator (HBAR). Both HBAR resonators support a plethora of acoustic modes, which can couple to the qubit near resonantly. We first show qubit-qubit interaction in the multimode system, and finally quantum state transfer where an excitation is swapped from an HBAR mode of one qubit, to an HBAR mode of the other qubit.