We show that optically active coupled quantum dots embedded in a superconducting microwave cavity can be used to realize a fast quantum interface between photonic and transmon qubits. Single photon absorption by a coupled quantum dot results in generation of a large electric dipole, which in turn ensures efficient coupling to the microwave cavity. Using cavity parameters achieved in prior experiments, we estimate that bi-directional microwave-optics conversion in nanosecond timescales with efficiencies approaching unity is experimentally feasible with current technology. We also outline a protocol for in-principle deterministic quantum state transfer from a time-bin photonic qubit to a transmon qubit. Recent advances in quantum dot based quantum photonics technologies indicate that the scheme we propose could play a central role in connecting quantum nodes incorporating cavity-coupled superconducting qubits.
@article{arxiv.1707.02195,
title = {Quantum interface between photonic and superconducting qubits},
author = {Yuta Tsuchimoto and Patrick Knüppel and Aymeric Delteil and Zhe Sun and Martin Kroner and Ataç Imamoğlu},
journal= {arXiv preprint arXiv:1707.02195},
year = {2017}
}