Improving precision scaling via backaction-evading continuous measurement in a driven-dissipative Kerr parametric oscillator
Abstract
Dissipative phase transitions in the driven-dissipative Kerr parametric oscillator offer a promising route for realizing criticality-enhanced quantum sensing based on continuous measurements. However, achieving such enhancement through realistic measurement schemes remains an outstanding challenge. Here, we extend the backaction-evasion strategy introduced in our earlier work for the Gaussian linear case [arXiv:2511.22248 (2025)] to analyze how the quantum and classical Fisher information scale with the Kerr nonlinearity at dissipative critical points. Our results show that backaction-evading homodyne monitoring achieves enhanced photon-number scaling that surpasses the standard quantum limit, and significantly outperforms alternative protocols such as continuous photon counting. As an additional methodological contribution, we also implement and benchmark time-discrete approximation schemes with improved statistical convergence properties. We use these methods to compute the classical Fisher information for continuous homodyne detection, and demonstrate that they provide efficient access to this quantity near dissipative critical points, thereby extending the reach of existing methods.
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BibTeX
@misc{zhang2026improving,
title = {{Improving precision scaling via backaction-evading continuous measurement in a driven-dissipative Kerr parametric oscillator}},
author = {Cheng Zhang and Xinhui Cui and Jiaying Pan and Xin-Qi Li and Mauro Cirio and Pengfei Liang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.15345},
eprint = {2609.15345},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.15345},
}
RIS
TY - UNPB
TI - Improving precision scaling via backaction-evading continuous measurement in a driven-dissipative Kerr parametric oscillator
AU - Cheng Zhang
AU - Xinhui Cui
AU - Jiaying Pan
AU - Xin-Qi Li
AU - Mauro Cirio
AU - Pengfei Liang
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2609.15345
UR - https://arxiv.org/abs/2609.15345
AB - Dissipative phase transitions in the driven-dissipative Kerr parametric oscillator offer a promising route for realizing criticality-enhanced quantum sensing based on continuous measurements. However, achieving such enhancement through realistic measurement schemes remains an outstanding challenge. Here, we extend the backaction-evasion strategy introduced in our earlier work for the Gaussian linear case [arXiv:2511.22248 (2025)] to analyze how the quantum and classical Fisher information scale with the Kerr nonlinearity at dissipative critical points. Our results show that backaction-evading homodyne monitoring achieves enhanced photon-number scaling that surpasses the standard quantum limit, and significantly outperforms alternative protocols such as continuous photon counting. As an additional methodological contribution, we also implement and benchmark time-discrete approximation schemes with improved statistical convergence properties. We use these methods to compute the classical Fisher information for continuous homodyne detection, and demonstrate that they provide efficient access to this quantity near dissipative critical points, thereby extending the reach of existing methods.
ER -