Laser cooling a centimeter-scale torsion pendulum

• URL: http://arxiv.org/abs/2409.02275v1
• Date: Tue, 3 Sep 2024 20:20:38 GMT
• Title: Laser cooling a centimeter-scale torsion pendulum
• Authors: Dong-Chel Shin, Tina M. Hayward, Dylan Fife, Rajesh Menon, Vivishek Sudhir,
• Abstract summary: We laser cool a centimeter-scale torsion pendulum to a temperature of 10 mK (average occupancy of 6000 phonons) starting from room temperature. This is achieved by optical radiation pressure forces conditioned on anoise-limited optical measurement of quantum pendulum's angular displacement. The measurement sensitivity is the result of a novel mirrored' optical lever that passively rejects extraneous spatial-mode noise by 60 dB.
• Score: 0.559239450391449
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We laser cool a centimeter-scale torsion pendulum to a temperature of 10 mK (average occupancy of 6000 phonons) starting from room temperature (equivalent to $2\times 10^8$ phonons). This is achieved by optical radiation pressure forces conditioned on a quantum-noise-limited optical measurement of the pendulum's angular displacement with an imprecision 13 dB below that at the standard quantum limit (SQL). The measurement sensitivity is the result of a novel `mirrored' optical lever that passively rejects extraneous spatial-mode noise by 60 dB. The high mechanical quality ($10^7$) and quantum-noise-limited sub-SQL measurement imprecision demonstrate the necessary ingredients for realizing the quantum ground state of torsional motion -- a pre-requisite for mechanical tests of gravity's alleged quantum nature.

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