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- Title
Four-wave-cooling to the single phonon level in Kerr optomechanics.
- Authors
Bothner, Daniel; Rodrigues, Ines C.; Steele, Gary A.
- Abstract
Cavity optomechanics has achieved groundbreaking control and detection of mechanical oscillators, based on their coupling to linear electromagnetic modes. Recently, however, there is increasing interest in cavity nonlinearities as resource in radiation-pressure interacting systems. Here, we present a flux-mediated optomechanical device combining a nonlinear superconducting quantum interference cavity with a mechanical nanobeam. We demonstrate how the Kerr nonlinearity of the circuit can be used to enhance the device performance by suppressing cavity frequency noise, and for a counter-intuitive sideband-cooling scheme based on intracavity four-wave-mixing. With a large single-photon coupling rate of up to g0 = 2π ⋅ 3.6 kHz and a high mechanical quality factor Qm ≈ 4 ⋅ 105, we achieve an effective four-wave cooperativity of C fw > 100 and demonstrate four-wave cooling of the mechanical oscillator close to its quantum groundstate. Our results advance the recently developed platform of flux-mediated optomechanics and demonstrate how cavity Kerr nonlinearities can be utilized in cavity optomechanics. Cavity optomechanics studies interactions between mechanical oscillators and the radiation pressure induced by intracavity photons. The authors embedded a nonlinear Josephson junction in their microwave cavity to make the cavity response highly nonlinear and observed a counter-intuitive optomechanical process, blue-tone mechanical cooling.
- Subjects
OPTOMECHANICS; FOUR-wave mixing; JOSEPHSON junctions; PHONONS; QUANTUM interference; RADIATION pressure
- Publication
Communications Physics, 2022, Vol 5, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-022-00808-3