Last Updated:
5 April 2012

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Sheon Chua

Low Frequency Squeezed Light

The Squeezed Light Experiment at the Centre for Gravitational Physics

Low frequency squeezed light (or low frequency 'squeezing') at GW signal frequencies (10Hz-10kHz) can be used to reduce quantum noise in GW detectors.

From our group's first demonstration of squeezing measured within the audio gravitational wave detection band using a degenerate Optical Parametric Oscillator [1], we have developed a squeezed light source that can produce and control squeezed light on timescales commensurate with GW detector science runs [2], and recently demonstrated at least 10dB of Quantum Noise reduction across the audio gravitational wave detection band [shown below - 3]

This work is done in collaboration with the ANU Quantum Optics group, the Quantum Measurement Group at MIT, USA and Albert Einstein Institute in Germany.

[1] K. McKenzie et al, Phys. Rev. Lett. 93, 161105 (2004) (paper)
[2] S. S. Y. Chua et al, Optics Letters 36, 4680-4682 (2011) (paper)
[3] M. S. Stefszky et al, paper in review