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Microwave-to-optical conversion with a gallium phosphide photonic crystal cavity. | LitMetric

Microwave-to-optical conversion with a gallium phosphide photonic crystal cavity.

Nat Commun

IBM Quantum, IBM Research Europe, Zurich, Säumerstrasse 4, CH-8803, Rüschlikon, Switzerland.

Published: April 2022

AI Article Synopsis

Article Abstract

Electrically actuated optomechanical resonators provide a route to quantum-coherent, bidirectional conversion of microwave and optical photons. Such devices could enable optical interconnection of quantum computers based on qubits operating at microwave frequencies. Here we present a platform for microwave-to-optical conversion comprising a photonic crystal cavity made of single-crystal, piezoelectric gallium phosphide integrated on pre-fabricated niobium circuits on an intrinsic silicon substrate. The devices exploit spatially extended, sideband-resolved mechanical breathing modes at ~3.2 GHz, with vacuum optomechanical coupling rates of up to g/2π ≈ 300 kHz. The mechanical modes are driven by integrated microwave electrodes via the inverse piezoelectric effect. We estimate that the system could achieve an electromechanical coupling rate to a superconducting transmon qubit of ~200 kHz. Our work represents a decisive step towards integration of piezoelectro-optomechanical interfaces with superconducting quantum processors.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9019098PMC
http://dx.doi.org/10.1038/s41467-022-28670-5DOI Listing

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