Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature

Abstract

We apply a feedback cooling technique to simultaneously cool the three electromechanical normal modes of the ton-scale resonant-bar gravitational wave detector AURIGA. The measuring system is based on a dc Superconducting Quantum Interference Device (SQUID) amplifier, and the feedback cooling is applied electronically to the input circuit of the SQUID. Starting from a bath temperature of 4.2 K, we achieve a minimum temperature of 0.17 mK for the coolest normal mode. The same technique, implemented in a dedicated experiment at subkelvin bath temperature and with a quantum limited SQUID, could allow to approach the quantum ground state of a kilogram-scale mechanical resonator.

4 pages, 4 figures

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Cited by in corpus (6)

• Cooling and squeezing the fluctuations of a nanomechanical beam by indirect quantum feedback control
• Quantum state preparation and macroscopic entanglement in gravitational-wave detectors
• Feedback control in quantum optics: an overview of experimental breakthroughs and areas of application
• Cooling a vibrational mode coupled to a molecular single-electron transistor
• A kg-mass prototype demonstrator for DUAL gravitational wave detector: opto-mechanical excitation and cooling
• Self-referenced opto-mechanical oscillator