International Journal of Physics | Vol. 17, No. 8, August 2026 | pp. 113–120
DOI: 10.46882/2026/IJP/000203
Research Article
Title: Quantum Noise Squeezing and Phase Stabilization Metrics in a Triply Resonant Optical Parametric Oscillator
Names of Authors: J. L. Manceau¹, R. T. Howard²
Authors’ Affiliations:
¹ Laboratoire Kastler Brossel, Sorbonne Université, CNRS, Paris, France
² Department of Physics, California Institute of Technology, Pasadena, USA
Abstract: Continuous-wave squeezed states of light are essential resources for quantum metrology, quantum communication protocols, and high-precision gravitational wave detection. This paper describes the design and experimental performance of a triply resonant optical parametric oscillator (OPO). The cavity contains a periodically poled lithium niobate crystal and is driven by a frequency-doubled 532.0 nm laser. By matching the resonance conditions for the pump, signal, and idler fields simultaneously, we achieved an exceptionally low parametric oscillation threshold of only 4.5 mW. We measured the quantum noise levels of the generated sub-harmonic fields at 1064.0 nm using a high-efficiency balanced homodyne detection system. The experimental setup achieved a maximum quadrature noise squeezing level of 8.2 dB below the shot-noise limit at a detection frequency of 5.0 MHz. After accounting for independent detection losses, including a photodiode quantum efficiency of 94.0% and an escape efficiency of 91.5%, the inferred squeezing level at the cavity output was determined to be 11.4 dB. We systematically monitored the stability of this squeezed state over an extended continuous runtime of 4.0 hours. The system maintained a variance of less than ±0.3 dB, enabled by an active digital feedback loop locking the relative phase of the local oscillator. These experimental results show that this OPO configuration provides a stable source of non-classical light for advanced quantum information networks.
Keywords: Quantum optics; Squeezed light; Optical parametric oscillator; Homodyne detection; Quantum metrology; Shot-noise limit
Manuscript Timeline: Received: June 10, 2026 / Revised: July 12, 2026 / Accepted: August 01, 2026 / Published: August 14, 2026
Citation: Manceau, J. L., & Howard, R. T. (2026). Quantum Noise Squeezing and Phase Stabilization Metrics in a Triply Resonant Optical Parametric Oscillator. International Journal of Physics, 17(8), 113–120.
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