Long wavelength squeezed light
Squeezed spectrum (red trace) showing the first demonstration of squeezed light at a wavelength of close to 2 micrometers. Frequencies close to 1 kHz have been achieved for levels of squeezing 4 dB below or shot noise. Yellow trace is anti squeezing and the purple trace is electronic detector noise.
Future generations of gravitational wave detectors are being designed to scan most of the visible universe and initiate a new field of gravitational wave cosmology. A technological innovation that may be used to achieve these sensitivities are squeezed light sources at a wavelength of near 2 micrometers. At ANU we are currently developing these squeezed light sources and have already achieved the first results in the world at this wavelength. Future work is planned to push the levels of squeezed light generation to as low as -12dB below the shot noise level.
 G. L. Mansell et al, Phys. Rev. Lett. 120 203603 (2018) (paper)