Low-loss high-impedance circuit for quantum transduction between optical and microwave photons

TL;DR

This paper introduces a low-loss, high-impedance superconducting resonator integrated with quantum dots, enabling efficient quantum transduction between optical and microwave photons for quantum networks.

Contribution

The paper presents a novel QD-high impedance resonator device with low microwave loss and strong coupling, advancing quantum transduction technology.

Findings

Microwave loss rate of 1.8 MHz achieved

Large single-microwave photon coupling strength of hundreds of MHz

Demonstrated gate tunability of quantum dots

Abstract

Quantum transducers between microwave and optical photons are essential for long-distance quantum networks based on superconducting qubits. An optically active self-assembled quantum dot molecule (QDM) is an attractive platform for the implementation of a quantum transducer because an exciton in a QDM can be efficiently coupled to both optical and microwave fields at the single-photon level. Recently, the transduction between microwave and optical photons has been demonstrated with a QDM integrated with a superconducting resonator. In this paper, we present a design of a QD-high impedance resonator device with a low microwave loss and an expected large single-microwave photon coupling strength of 100s of MHz. We integrate self-assembled QDs onto a high-impedance superconducting resonator using a transfer printing technique and demonstrate a low-microwave loss rate of 1.8 MHz and gate tunability of the QDs. The microwave loss rate is much lower than the expected QDM-resonator coupling strength as well as the typical transmon-resonator coupling strength. This feature will facilitate efficient quantum transduction between an optical and microwave qubit.