Room temperature optomechanical squeezing

Kavli Affiliate: Nergis Mavalvala

| First 5 Authors: Nancy Aggarwal, Torrey Cullen, Jonathan Cripe, Garrett D. Cole, Robert Lanza

| Summary:

The radiation-pressure driven interaction of a coherent light field with a
mechanical oscillator induces correlations between the amplitude and phase
quadratures of the light. These correlations result in squeezed light — light
with quantum noise lower than shot noise in some quadratures, and higher in
others. Due to this lower quantum uncertainty, squeezed light can be used to
improve the sensitivity of precision measurements. In particular, squeezed
light sources based on nonlinear optical crystals are being used to improve the
sensitivity of gravitational wave (GW) detectors. For optomechanical squeezers,
thermally driven fluctuations of the mechanical oscillator’s position makes it
difficult to observe the quantum correlations at room temperature, and at low
frequencies. Here we present a measurement of optomechanically (OM) squeezed
light, performed at room-temperature, in a broad band near audio-frequency
regions relevant to GW detectors. We observe sub-poissonian quantum noise in a
frequency band of 30 kHz to 70 kHz with a maximum reduction of 0.7 $pm$ 0.1 dB
below shot noise at 45 kHz. We present two independent methods of measuring
this squeezing, one of which does not rely on calibration of shot noise.

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