Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging
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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BibTeX
@misc{moos2026phase,
title = {{Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging}},
author = {Jonas L. Moos and Cristofero Oglialoro and Enno Giese and Markus Gräfe},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.07338},
eprint = {2609.07338},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.07338},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging
AU - Jonas L. Moos
AU - Cristofero Oglialoro
AU - Enno Giese
AU - Markus Gräfe
PY - 2026
DA - 2026/09/07
PB - arXiv
DO - 10.48550/arxiv.2609.07338
UR - https://arxiv.org/abs/2609.07338
AB - 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.
ER -