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Squeezed vacuum phase control at 2  μm.

M J Yap, D W Gould, T G McRae

    Optics Letters
    |November 2, 2019
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    Summary
    This summary is machine-generated.

    We achieved phase control for vacuum-squeezed light at 2 μm, crucial for future gravitational wave observatories. This technology enables noise analysis below 1 kHz, identifying limitations for enhanced sensitivity.

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    Area of Science:

    • Quantum optics
    • Gravitational wave detection

    Background:

    • Future gravitational wave observatories require advanced technologies like squeezed light.
    • Phase control of squeezed light is essential for improving sensitivity and understanding noise sources.

    Purpose of the Study:

    • To demonstrate phase control for vacuum-squeezed light at a 2 μm wavelength.
    • To investigate noise behavior below 1 kHz and identify squeezing limitations.

    Main Methods:

    • Development of a phase control scheme for 2 μm squeezed light.
    • Direct measurement of squeezing and antisqueezing levels relative to shot noise.
    • Analysis of noise contributions below 1 kHz.

    Main Results:

    • Measured 3.9±0.2 dB of squeezing from 2 kHz to 80 kHz.
    • Measured 14.2±0.3 dB of antisqueezing.
    • Identified dark noise and scattered light as limitations below 1 kHz.
    • Concluded 11.3 dB of squeezing generation at the optical parametric oscillator, accounting for all losses.

    Conclusions:

    • Phase control of 2 μm squeezed light is feasible and necessary for gravitational wave observatories.
    • Current squeezing levels are limited by photodetector quantum efficiency and laser instabilities.
    • Further improvements in these areas are needed to reach higher squeezing levels.