The Menon Lab

Advancing Optics, Nanofabrication & Computation.



Laser cooling a centimeter-scale torsion pendulum


Journal article


Dong-Chel Shin, Tina M Hayward, Dylan Fife, Rajesh Menon, Vivishek Sudhir
arXiv preprint arXiv:2409.02275, 2024

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APA   Click to copy
Shin, D.-C., Hayward, T. M., Fife, D., Menon, R., & Sudhir, V. (2024). Laser cooling a centimeter-scale torsion pendulum. ArXiv Preprint ArXiv:2409.02275.


Chicago/Turabian   Click to copy
Shin, Dong-Chel, Tina M Hayward, Dylan Fife, Rajesh Menon, and Vivishek Sudhir. “Laser Cooling a Centimeter-Scale Torsion Pendulum.” arXiv preprint arXiv:2409.02275 (2024).


MLA   Click to copy
Shin, Dong-Chel, et al. “Laser Cooling a Centimeter-Scale Torsion Pendulum.” ArXiv Preprint ArXiv:2409.02275, 2024.


BibTeX   Click to copy

@article{shin2024a,
  title = {Laser cooling a centimeter-scale torsion pendulum},
  year = {2024},
  journal = {arXiv preprint arXiv:2409.02275},
  author = {Shin, Dong-Chel and Hayward, Tina M and Fife, Dylan and Menon, Rajesh and Sudhir, Vivishek}
}

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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