biostudies-literatureRochman JUnited States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific ResearchUnited States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research (AF Office of Scientific Research)1153https://www.ebi.ac.uk/biostudies/studies/S-EPMC9977906biostudies-literatureUnknown14(1)Optical quantum networks can connect distant quantum processors to enable secure quantum communication and distributed quantum computing. Superconducting qubits are a leading technology for quantum information processing but cannot couple to long-distance optical networks without an efficient, coherent, and low noise interface between microwave and optical photons. Here, we demonstrate a microwave-to-optical transducer using an ensemble of erbium ions that is simultaneously coupled to a superconducting microwave resonator and a nanophotonic optical resonator. The coherent atomic transitions of the ions mediate the frequency conversion from microwave photons to optical photons and using photon counting we observed device conversion efficiency approaching 10^-7. With pulsed operation at a low duty cycle, the device maintained a spin temperature below 100 mK and microwave resonator heating of less than 0.15 quanta.Nature communicationsMicrowave-to-optical transduction with erbium ions coupled to planar photonic and superconducting resonators.PMC9977906FA9550-21-1-0055Xie TBartholomew JGFaraon ASchwab KCRochman JfalseMicrowave-to-optical transduction with erbium ions coupled to planar photonic and superconducting resonators.Optical quantum networks can connect distant quantum processors to enable secure quantum communication and distributed quantum computing. Superconducting qubits are a leading technology for quantum information processing but cannot couple to long-distance optical networks without an efficient, coherent, and low noise interface between microwave and optical photons. Here, we demonstrate a microwave-to-optical transducer using an ensemble of erbium ions that is simultaneously coupled to a superconducting microwave resonator and a nanophotonic optical resonator. The coherent atomic transitions of the ions mediate the frequency conversion from microwave photons to optical photons and using photon counting we observed device conversion efficiency approaching 10^-7. With pulsed operation at a low duty cycle, the device maintained a spin temperature below 100 mK and microwave resonator heating of less than 0.15 quanta.2023-01-01T00:00:00Z2023 Mar2025-04-22T21:43:42.357Z2025-04-06T03:43:36.053ZS-EPMC99779063685948610.1038/s41467-023-36799-0