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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Frequency-Dependent Squeezed Vacuum Source for the Advanced Virgo Gravitational-Wave Detector.
F Acernese1,2, M Agathos3, A Ain4
1Dipartimento di Farmacia, Università di Salerno, I-84084 Fisciano, Salerno, Italy.
Physical Review Letters
|August 11, 2023
Summary
We developed a frequency-dependent squeezed vacuum source to reduce quantum noise in the Advanced Virgo Plus gravitational-wave detector. This technology is crucial for enhancing gravitational-wave detection sensitivity.
Area of Science:
- Quantum Optics
- Gravitational-Wave Astronomy
Background:
- Advanced Virgo Plus requires broadband quantum noise reduction for enhanced sensitivity.
- Quantum noise limits the sensitivity of current gravitational-wave detectors.
Purpose of the Study:
- To design and test a frequency-dependent squeezed vacuum source for the Advanced Virgo Plus detector.
- To achieve broadband quantum noise reduction in gravitational-wave measurements.
Main Methods:
- Generated frequency-dependent squeezed light by phase-rotating a squeezed vacuum state.
- Utilized a 285m long, high-finesse, near-detuned optical resonator for phase rotation.
- Maintained rotation frequency stability within 6 Hz rms.
Main Results:
- Achieved approximately 8.5 dB of generated squeezing.
- Demonstrated up to 5.6 dB quantum noise suppression at high frequencies.
- Measured ~2 dB noise reduction near the filter cavity resonance frequency due to intracavity losses.
- Expected reduction of quantum shot noise and radiation pressure noise by up to 4.5 dB and 2 dB, respectively, within the interferometer.
Conclusions:
- The developed frequency-dependent squeezed vacuum source meets the requirements for the Advanced Virgo Plus.
- The technology promises significant improvements in gravitational-wave detection sensitivity by reducing quantum noise.
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