Dalidet Romain, Martin Anthony, Sauder Grégory, Labonté Laurent, Tanzilli Sébastien
Université Côte d'Azur, CNRS, Institut de physique de Nice, Nice, France.
Sci Rep. 2025 Jul 29;15(1):27654. doi: 10.1038/s41598-025-09533-7.
Quantum interferometry methods exploit quantum resources, such as photonic entanglement, to enhance phase estimation beyond classical limits. Nonlinear optics has served as a workhorse for the generation of entangled photon pairs, ensuring both energy and phase conservation, but at the cost of limited rate and degraded signal-to-noise ratio compared to laser-based interferometry approaches. We present a "quantum-like" nonlinear optical method that reaches super-resolution in classical detection regime. This is achieved by replacing photon-pairs by coherent states of light, mimicking quantum properties through classical nonlinear optics processes. Our scheme utilizes two high-brightness lasers. This results in a substantially greater signal-to-noise ratio compared to its quantum counterpart. Such an approach paves the way to significantly reduced acquisition times, providing a pathway to explore signals across a broader range of bandwidth. The need to increase the frequency bandwidth of the quantum sensor significantly motivates the potential applications of this pathway.
量子干涉测量方法利用诸如光子纠缠等量子资源，以超越经典极限来增强相位估计。非线性光学一直是产生纠缠光子对的主力，确保了能量和相位守恒，但与基于激光的干涉测量方法相比，代价是速率有限且信噪比降低。我们提出了一种“类量子”非线性光学方法，该方法在经典检测 regime 中实现了超分辨率。这是通过用相干光态取代光子对，通过经典非线性光学过程模拟量子特性来实现的。我们的方案使用了两台高亮度激光器。与量子对应方案相比，这导致信噪比大幅提高。这种方法为显著减少采集时间铺平了道路，为探索更广泛带宽范围内的信号提供了一条途径。大幅提高量子传感器频率带宽的需求极大地推动了这条途径的潜在应用。
