Path-Degenerate Quantum Interferometry for Decoherence Mitigation in Gravitational-Wave Detectors

• URL: http://arxiv.org/abs/2609.12204v1
• Date: Thu, 10 Sep 2026 20:58:33 GMT
• Title: Path-Degenerate Quantum Interferometry for Decoherence Mitigation in Gravitational-Wave Detectors
• Abstract summary: We propose a path-degenerate quantum interferometry scheme that obviates the need for entire optical subsystems.<n>Our approach offers a highly optimized route toward enhanced quantum-noise reduction in upcoming LIGO upgrades and next-generation gravitational-wave observatories.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Optical decoherence degrades quantum correlations in squeezed states of light, severely limiting the quantum-nondemolition (QND) sensitivity of gravitational-wave detectors. Here, we propose the path-degenerate quantum interferometry scheme that obviates the need for entire optical subsystems---including additional filter cavities, auxiliary parametric amplifiers, and Faraday isolators---thereby drastically reducing spatial mode mismatches while inherently integrating variational output, a long-standing theoretical proposal to further deepen the QND regime. We experimentally demonstrate a core aspect of this scheme, achieving a shot-noise-preserving signal enhancement that directly counteracts the detrimental effects of readout loss. By delivering an improved signal-to-quantum-noise ratio solely through the consolidation and reduction of currently considered optical subsystems, our approach offers a highly optimized route toward enhanced quantum-noise reduction in upcoming LIGO upgrades and next-generation gravitational-wave observatories.

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