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

Abstract

We present the generation and detection of squeezed light in the 2 $\mu \mathrm{m}$ 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 laser, and squeezing is detected using balanced homodyne detection with extended InGaAs photodiodes. We have measured $4.0\pm 0.1$ dB of squeezing and $10.5\pm 0.5$ dB of anti-squeezing relative to the shot noise level in the audio frequency band, limited by photodiode quantum efficiency. The inferred squeezing level directly after the optical parametric oscillator, after accounting for known losses and phase noise, is 10.7 dB.

arXiv comment5 pages, 3 figures

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• Highly-efficient generation of coherent light at 2128 nm via degenerate optical-parametric oscillation
• Amplified Squeezed States: Analyzing Loss and Phase Noise
• Polarization Purity and Dispersion Characteristics of Nested Antiresonant Nodeless Hollow-Core Optical Fiber at Near- and Short-wave-IR Wavelengths for Quantum Communications
• Shot-Noise Limited Homodyne Detection for MHz Quantum Light Characterisation in the 2 μm Band
• True and apparent motion of optomechanical resonators, with applications to feedback cooling of gravitational wave detector test masses