Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Hybrid Quantum Systems
Q 4.2: Vortrag
Montag, 11. März 2024, 11:15–11:30, HS 1199
Theory of phase-adaptive parametric cooling — •Pardeep Kumar1, Alekhya Ghosh1,2, Christian Sommer3, Fidel G. Jimenez4, Vivishek Sudhir5,6, and Claudiu Genes1,2 — 1Max Planck Institute for the Science of Light, Staudtstraße 2, D-91058 Erlangen, Germany — 2Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, D-91058 Erlangen, Germany — 3AQT, Technikerstraße 17, 6020, Austria — 4Pontificia Universidad Católica del Perú, Av. Universitaria 1801, San Miguel 15088, Peru — 5LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA — 6Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
An adaptive phase technique has been proposed for the parametric cooling of the mechanical oscillators. The method calls for a sequence of periodic adjustments of the phase of a parametric modulation of the mechanical oscillator that is conditioned on measurements of its two quadratures. This technique indicates a pure exponential loss of the thermal energy at initial high occupancies. As the quantum ground state is approached, the phase adaptive scheme leads to residual occupancies at the level of a few phonons owing to the competition between parametric amplification of the quantum fluctuations and the feedback action. In contrast to available parametric feedback cooling techniques, the proposed phase-adaptive technique remains immune from the extraneous heating arising from direct modulation of the radiation pressure force.
Keywords: Cooling; Parametric Modulation; Mechanical Oscillator; Occupation; Measurement