20 research outputs found
Coupling a superconducting quantum circuit to a phononic crystal defect cavity
Connecting nanoscale mechanical resonators to microwave quantum circuits
opens new avenues for storing, processing, and transmitting quantum
information. In this work, we couple a phononic crystal cavity to a tunable
superconducting quantum circuit. By fabricating a one-dimensional periodic
pattern in a thin film of lithium niobate and introducing a defect in this
artificial lattice, we localize a 6 gigahertz acoustic resonance to a
wavelength-scale volume of less than one cubic micron. The strong
piezoelectricity of lithium niobate efficiently couples the localized
vibrations to the electric field of a widely tunable high-impedance Josephson
junction array resonator. We measure a direct phonon-photon coupling rate
and a mechanical quality factor
leading to a cooperativity when
the two modes are tuned into resonance. Our work has direct application to
engineering hybrid quantum systems for microwave-to-optical conversion as well
as emerging architectures for quantum information processing.Comment: 9 pages, 7 figure
A silicon-organic hybrid platform for quantum microwave-to-optical transduction
Low-loss fiber optic links have the potential to connect superconducting quantum processors together over long distances to form large scale quantum networks. A key component of these future networks is a quantum transducer that coherently and bidirectionally converts photons from microwave frequencies to optical frequencies. We present a platform for electro-optic photon conversion based on silicon-organic hybrid photonics. Our device combines high quality factor microwave and optical resonators with an electro-optic polymer cladding to perform microwave-to-optical photon conversion from 6.7 GHz to 193 THz (1558 nm). The device achieves an electro-optic coupling rate of 590 Hz in a millikelvin dilution refrigerator environment. We use an optical heterodyne measurement technique to demonstrate the single-sideband nature of the conversion with a selectivity of approximately 10 dB. We analyze the effects of stray light in our device and suggest ways in which this can be mitigated. Finally, we present initial results on high-impedance spiral resonators designed to increase the electro-optic coupling
III/V-on-lithium niobate amplifiers and lasers
We demonstrate electrically pumped, heterogeneously integrated lasers on thin-film lithium niobate, featuring electro-optic wavelength tunability. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreemen