自发非线性干涉测量中的相位估计用于增强量子成像
Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging
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中文总结 AI 辅助
本文实验和理论证明自发非线性干涉仪在相位灵敏度上优于非纠缠配置，通过最佳工作点向暗条纹移动实现增强，并给出设计选择。
中文摘要 AI 辅助
双色量子成像原则上可以利用高增益参量下转换产生的压缩光达到接近海森堡极限的相位超灵敏度，但现有的量子成像装置通常工作在低增益的自发辐射区域，在此区域无法实现这种标度。在这里，我们从实验和理论上证明，即使在自发辐射区域，对称非线性干涉仪在相位灵敏度上仍优于未将纠缠作为量子计量资源利用的配置，尽管可实现的相位灵敏度仍受散粒噪声限制。这一优势表现为最佳工作点向暗条纹移动，这是高增益超灵敏度机制的低增益特征。我们据此推导出相位优化的非线性干涉仪的设计选择，倾向于利用纠缠作为计量资源的配置，并指定其最佳工作点。
英文摘要
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.
发表机构
- Technische Universität Darmstadt（达姆施塔特工业大学）
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