论文标题
通过使用弱值扩增，使用不完善的检测器接近量子限制的计量学
Approaching quantum-limited metrology with imperfect detectors by using weak-value amplification
论文作者
论文摘要
弱价值扩增（WVA）是一种计量方案，可扩大超小的物理效应。但是，放大的结果必然会以高度抑制的概率发生，从而导致有关与常规测量（CM）相比是否提高了整体测量精度是否提高的广泛争论。在这里，我们在实验上证明了WVA的明确优势，这些优势克服了实际局限性，包括噪声和光检测的饱和度，并维持射击量表的精度，用于在光电探测器的动态范围之外的大量输入光强度。 WVA达到的精度是我们设置中CM的精度。我们的结果清除了WVA在涉及测量小信号（包括精确测量和商业传感器）的应用中广泛使用的方法。
Weak value amplification (WVA) is a metrological protocol that amplifies ultra-small physical effects. However, the amplified outcomes necessarily occur with highly suppressed probabilities, leading to the extensive debate on whether the overall measurement precision is improved in comparison to that of conventional measurement (CM). Here, we experimentally demonstrate the unambiguous advantages of WVA that overcome practical limitations including noise and saturation of photo-detection and maintain a shot-noise-scaling precision for a large range of input light intensity well beyond the dynamic range of the photodetector. The precision achieved by WVA is six times higher than that of CM in our setup. Our results clear the way for the widespread use of WVA in applications involving the measurement of small signals including precision metrology and commercial sensors.
