Ultra-low-noise Microwave to Optics Conversion in Gallium Phosphide

• URL: http://arxiv.org/abs/2107.04433v2
• Date: Fri, 25 Nov 2022 11:21:14 GMT
• Title: Ultra-low-noise Microwave to Optics Conversion in Gallium Phosphide
• Authors: Robert Stockill, Moritz Forsch, Frederick Hijazi, Gr\'egoire Beaudoin, Konstantinos Pantzas, Isabelle Sagnes, R\'emy Braive, Simon Gr\"oblacher
• Abstract summary: Mechanical resonators can act as excellent intermediaries to interface single photons in the microwave and optical domains. We exploit the remarkable properties of thin-film gallium phosphide to demonstrate bi-directional on-chip conversion between microwave and optical frequencies.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Mechanical resonators can act as excellent intermediaries to interface single photons in the microwave and optical domains due to their high quality factors. Nevertheless, the optical pump required to overcome the large energy difference between the frequencies can add significant noise to the transduced signal. Here we exploit the remarkable properties of thin-film gallium phosphide to demonstrate bi-directional on-chip conversion between microwave and optical frequencies, realized by piezoelectric actuation of a Gigahertz-frequency optomechanical resonator. The large optomechanical coupling and the suppression of two-photon absorption in the material allows us to operate the device at optomechanical cooperativities greatly exceeding one. Alternatively, when using a pulsed upconversion pump, we demonstrate that we induce less than one thermal noise phonon. We include a high-impedance on-chip matching resonator to mediate the mechanical load with the 50-Ohm source. Our results establish gallium phosphide as a versatile platform for ultra-low-noise conversion of photons between microwave and optical frequencies.

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