Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging

• URL: http://arxiv.org/abs/2609.07338v1
• Date: Mon, 07 Sep 2026 11:01:14 GMT
• Title: Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging
• Abstract summary: Bicolor quantum imaging can reach, in principle, phase supersensitivity approaching the Heisenberg limit.<n> established quantum-imaging setups typically operate in the low-gain, spontaneous regime.<n>We show that a symmetric nonlinear interferometer, even in the spontaneous regime, retains a phase-sensitivity advantage.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Bicolor quantum imaging can reach, in principle, phase supersensitivity approaching the Heisenberg limit using squeezed light from high-gain parametric down-conversion, but established quantum-imaging setups typically operate in the low-gain, spontaneous regime, where such scaling is inaccessible. Here, we show experimentally and theoretically that a symmetric nonlinear interferometer, even in the spontaneous regime, retains a phase-sensitivity advantage over configurations where entanglement is not exploited as a quantum-metrological resource, although the achievable phase sensitivity remains shot-noise-limited. This advantage appears as a shift of the optimal working point toward the dark fringe, the low-gain signature of the mechanism underlying high-gain supersensitivity. We derive design choices for phase-optimized nonlinear interferometers accordingly, favoring configurations that exploit entanglement as a metrological resource and specifying their optimal operating point.

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