2025
Hu, Xiang-Yun; Huang, Jing-Hui; He, Fei-Fan; Wang, Guang-Jun; Dada, Adetunmise Charles
Mitigating source and detection noises in autocorrelative weak-value amplification Journal Article
In: Physical Review A, vol. 112, no. 4, pp. 042223, 2025.
Abstract | Links | BibTeX | Tags: autocorrelative weak-value amplification, detection noise, precision measurement, Quantum Metrology, source noise, technical noise, weak-value amplification
@article{Hu2025,
title = {Mitigating source and detection noises in autocorrelative weak-value amplification},
author = {Xiang-Yun Hu and Jing-Hui Huang and Fei-Fan He and Guang-Jun Wang and Adetunmise Charles Dada},
url = {https://link.aps.org/doi/10.1103/vr7v-lwtb},
doi = {10.1103/vr7v-lwtb},
year = {2025},
date = {2025-01-01},
journal = {Physical Review A},
volume = {112},
number = {4},
pages = {042223},
abstract = {Weak-value amplification (WVA) is a post-selection-based technique that amplifies weak physical signals by preparing nearly orthogonal pre- and post-selected quantum states. It is intrinsically limited by various kinds of technical noise, which distorts amplified weak values, especially when discarding photons in post-selection. While prior work established the efficacy of auto-correlative weak-value amplification (AWVA) under Gaussian noise, practical implementations face challenges from band-limited laser-source noise and detection noise. Here, we demonstrate that the AWVA protocol robustly suppresses both laser-power fluctuations and detection noise. Numerical experiments in Simulink further reveal AWVA dual advantage. Under high-power conditions, the noise-reduction superiority of AWVA over WVA becomes increasingly pronounced as input laser power increases. In detection-limited regimes, AWVA achieves an order-of-magnitude lower uncertainty, closely approaching the Cram'er-Rao bound. This work demonstrates that AWVA improves precision in both high-power laser-noise-dominated and photon-starved regimes, thereby bridging these operating extremes and advancing precision in applications from gravitational-wave detection to hybrid quantum systems.},
keywords = {autocorrelative weak-value amplification, detection noise, precision measurement, Quantum Metrology, source noise, technical noise, weak-value amplification},
pubstate = {published},
tppubtype = {article}
}
Weak-value amplification (WVA) is a post-selection-based technique that amplifies weak physical signals by preparing nearly orthogonal pre- and post-selected quantum states. It is intrinsically limited by various kinds of technical noise, which distorts amplified weak values, especially when discarding photons in post-selection. While prior work established the efficacy of auto-correlative weak-value amplification (AWVA) under Gaussian noise, practical implementations face challenges from band-limited laser-source noise and detection noise. Here, we demonstrate that the AWVA protocol robustly suppresses both laser-power fluctuations and detection noise. Numerical experiments in Simulink further reveal AWVA dual advantage. Under high-power conditions, the noise-reduction superiority of AWVA over WVA becomes increasingly pronounced as input laser power increases. In detection-limited regimes, AWVA achieves an order-of-magnitude lower uncertainty, closely approaching the Cram'er-Rao bound. This work demonstrates that AWVA improves precision in both high-power laser-noise-dominated and photon-starved regimes, thereby bridging these operating extremes and advancing precision in applications from gravitational-wave detection to hybrid quantum systems.