Sideband control of a multimode quantum bulk acoustic system

TL;DR

This paper demonstrates selective control of individual modes in a multimode bulk acoustic system using sideband modulation, enabling precise quantum state manipulation for potential quantum computing applications.

Contribution

It introduces a novel sideband control technique to access and manipulate individual acoustic modes in a multimode quantum system.

Findings

Successful experimental access to individual acoustic modes

Demonstration of mode-selective coupling control

Potential for improved quantum memory and processing

Abstract

Multimode bulk acoustic systems show promise for use in superconducting quantum computation. They can serve as a medium term memory storage, with exceptional coherence times demonstrated, and they exhibit a mode density that is physically highly compact. Here we experimentally demonstrate accessing individual acoustic modes without being hindered by the uniform frequency spacing of the modes. We use sideband control where a low-frequency modulation is applied to the transmon qubit energy. The amplitude of the modulation defines the qubit-acoustic mode coupling, and its frequency detunes the acoustic sidebands, therefore enabling selectively switching on or off the interaction, and allows for a full control on the individual modes.