Large-bandwidth Transduction Between an Optical Single Quantum Dot Molecule and a Superconducting Resonator
Yuta Tsuchimoto, Zhe Sun, Emre Togan, Stefan Fält, W. Wegscheider, Andreas J. Wallraff, K. Ensslin, Ataç İmamoğlu, Martin Kroner · PRX Quantum · 2022
Quantum transduction between the microwave and optical domains is an outstanding challenge for long-distance quantum networks based on superconducting qubits.For all transducers realized to date, the generally weak light-matter coupling does not allow high transduction efficiency, large bandwidth, and low noise simultaneously.Here we show that a large electric dipole moment of an exciton in an optically active self-assembled quantum dot molecule (QDM) efficiently couples to a microwave resonator field at the single-photon level.This allows for transduction between microwave and optical photons without coherent optical pump fields to enhance the interaction.With an on-chip device, we demonstrate a sizeable single-photon coupling strength of 16 MHz.Thanks to the fast exciton decay in the QDM, the transduction bandwidth between an optical and microwave resonator photon reaches several 100 s of MHz.We also show that the transduction process via the QDM is fully coherent within the measurement error range.