Blar i Institutt for realfag og industrisystemer på forfatter "Børkje, Kjetil"
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Critical quantum fluctuations and photon antibunching in optomechanical systems with large single-photon cooperativity
Børkje, Kjetil (Journal article; Peer reviewed, 2020)A pertinent question in cavity optomechanics is whether reaching the regime of large single-photon cooperativity, where the single-photon coupling rate exceeds the geometric mean of the cavity and mechanical decay rates, ... -
Nonclassical photon statistics in two-tone continuously driven optomechanics
Børkje, Kjetil; Massel, Francesco Pietro; Harris, Jack (Peer reviewed; Journal article, 2021)In cavity optomechanics, single-photon detection of Raman scattered photons can be a useful tool for observing nonclassical features of both radiation and motion. While this tool has been employed in experiments with pulsed ... -
Theory of bifurcation amplifiers utilizing the nonlinear dynamical response of an optically damped mechanical oscillator
Børkje, Kjetil (Peer reviewed; Journal article, 2019)We consider a standard optomechanical system where a mechanical oscillator is coupled to a cavity mode through the radiation pressure interaction. The oscillator is coherently driven at its resonance frequency, whereas the ... -
Two-dimensional quantum motion of a levitated nanosphere
Ranfagni, A.; Børkje, Kjetil; Marino, F.; Marin, F. (Peer reviewed; Journal article, 2022)We report on the two-dimensional (2D) dynamics of a levitated nanoparticle in an optical cavity. The motion of the nanosphere is strongly coupled to the cavity field by coherent scattering and heavily cooled in the plane ...