Quantum phase modulation with acoustic cavities and quantum dots

TL;DR

This paper demonstrates efficient quantum phase modulation using gigahertz acoustic cavities coupled to quantum dots and superconducting circuits, enabling low-noise transduction between microwave and optical photons for quantum information processing.

Contribution

It introduces a novel platform combining acoustic cavities, quantum dots, and superconducting circuits for low-power quantum phase modulation at microwave frequencies.

Findings

Strong modulation of single photons with 44 mV half-wave voltage

Subnatural linewidths of modulation sidebands

Efficient transduction between microwave and optical quantum states

Abstract

Fast, efficient, and low power modulation of light at microwave frequencies is crucial for chip-scale classical and quantum processing as well as for long-range networks of superconducting quantum processors. A successful approach to bridge the gap between microwave and optical photons has been to use intermediate platforms such as acoustic waves, which can couple efficiently to a variety of quantum systems. Here, we use gigahertz-frequency focusing surface acoustic wave cavities on GaAs that are piezo-electrically coupled to superconducting circuits and parametrically coupled, via strain, to photons scattered from InAs quantum dots . We demonstrate strong modulation of single photons with a half-wave voltage as low as 44 mV, and subnatural modulation sideband linewidths. These demonstrations pave the way for efficient and low-noise transduction of quantum information between microwave and optical domains.