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Squeezing at the Normal-Mode Splitting Frequency of a Nonlinear Coupled Cavity
Jonas Junker1,2, Jiayi Qin1, Vaishali B Adya3
1Australian National University, OzGrav, Centre for Gravitational Astrophysics, Research School of Physics & Research School of Astronomy and Astrophysics, Australian Capital Territory, Australia.
Abstract:
Coupled optical cavities, which support normal modes, play a critical role in optical filtering, sensing, slow-light generation, and quantum state manipulation. Recent theoretical work has proposed incorporating nonlinear materials into these systems to enable novel quantum technologies. Here, we report the first experimental demonstration of squeezing generated in a quantum-enhanced coupled-cavity system, achieving a quantum noise reduction of 3.3 dB around the normal-mode splitting frequency of 7.47 MHz. We provide a comprehensive analysis of the system's loss mechanisms and performance limitations, validating theoretical predictions. Our results underscore the promise of coupled-cavity squeezers for advanced quantum applications, including gravitational wave detection and precision sensing.
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