title: Mechanically Mediated Microwave Frequency Conversion in the Quantum Regime.
abstract: We report the observation of efficient and low-noise frequency conversion between two microwave modes, mediated by the motion of a mechanical resonator subjected to radiation pressure. We achieve coherent conversion of more than 10^{12}  photons/s with a 95% efficiency and a 14 kHz bandwidth. With less than 10^{-1}  photons·s^{-1}·Hz^{-1} of added noise, this optomechanical frequency converter is suitable for quantum state transduction. We show the ability to operate this converter as a tunable beam splitter, with direct applications for photon routing and communication through complex quantum networks.
authors.affiliation: National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
authors.forename: F
authors.initials: F
authors.lastname: Lecocq
authors.affiliation: National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
authors.forename: J B
authors.initials: JB
authors.lastname: Clark
authors.affiliation: National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: Simmonds
authors.affiliation: National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
authors.forename: J
authors.initials: J
authors.lastname: Aumentado
authors.affiliation: National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Teufel