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3 documents, page 1 of 1

A robust single-beam optical trap for a gram-scale mechanical oscillator

Altin, P. A.; Nguyen, T. T.-H.; Slagmolen, B. J. J.; Ward, R. L.; Shaddock, D. A.; McClelland, D. E. (2017)
Projects: ARC | Discovery Projects - Grant ID: DP160100760 (DP160100760), ARC | Future Fellowships - Grant ID: FT130100329 (FT130100329)
Precise optical control of microscopic particles has been mastered over the past three decades, with atoms, molecules and nano-particles now routinely trapped and cooled with extraordinary precision, enabling rapid progress in the study of quantum phenomena. Achieving the same level of control over macroscopic objects is expected to bring further advances in precision measurement, quantum information processing and fundamental tests of quantum mechanics. However, cavity optomechanical systems...

Observation of squeezed light in the 2 $\mathrm{\mu m}$ region

Mansell, Georgia L.; McRae, Terry G.; Altin, Paul A.; Yap, Min Jet; Ward, Robert L.; Slagmolen, Bram J. J.; Shaddock, Daniel A.; McClelland, David E. (2018)
Projects: ARC | Future Fellowships - Grant ID: FT130100329 (FT130100329), ARC | ARC Centres of Excellences - Grant ID: CE170100004 (CE170100004)
We present the generation and detection of squeezed light in the 2 $\mathrm{\mu m}$ wavelength region. This experiment is a crucial step in realising the quantum noise reduction techniques that will be required for future generations of gravitational-wave detectors. Squeezed vacuum is generated via degenerate optical parametric oscillation from a periodically-poled potassium titanyl phosphate crystal, in a dual resonant cavity. The experiment uses a frequency stabilised 1984 nm thulium fibre ...

LISA pathfinder appreciably constrains collapse models

LISA Pathfinder's measurement of a relative acceleration noise between two free-falling test masses with a square root of the power spectral density of $5.2 \pm 0.1 \mbox{ fm s}^{-2}/\sqrt{\rm{Hz}}$ appreciably constrains collapse models. In particular, we bound the localization rate parameter, $\lambda_{\rm CSL}$, in the continuous spontaneous localization model (CSL) to be at most $\left( 2.96 \pm 0.12 \right) \times 10^{-8} \mbox{ s}^{-1}$. Moreover, we bound the regularization scale, $\si...
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