论文标题
通过频繁的量子测量来传感微观噪声事件
Sensing microscopic noise events by frequent quantum measurements
论文作者
论文摘要
我们提出并在实验上证明了一种通用方法，使我们能够揭开影响连续量子变量的微观噪声事件。通过频繁测量离散变量耦合到连续变量，可以实现这种解开。实验实现涉及遍历嘈杂通道的光子。在那里，它们的极化（其与光子空间波袋的耦合受到随机噪声的影响）经常在量子Zeno状态下进行测量。这些测量不仅保留了极化状态，而且还可以通过从通道出现的光子检测到空间分辨的检测来记录完整的噪声统计数据。该方法证明了将光子用作量子噪声传感器和强大信息载体的可能性。
We propose and experimentally demonstrate a general method allowing us to unravel microscopic noise events that affect a continuous quantum variable. Such unraveling is achieved by frequent measurements of a discrete variable coupled to the continuous one. The experimental realization involves photons traversing a noisy channel. There, their polarization, whose coupling to the photons spatial wavepacket is subjected to stochastic noise, is frequently measured in the quantum Zeno regime. The measurements not only preserve the polarization state, but also enable the recording of the full noise statistics from the spatially-resolved detection of the photons emerging from the channel. This method proves the possibility of employing photons as quantum noise sensors and robust carriers of information.
