论文标题
单循环探测器的单周THZ场的电流采样
Electro-Optical Sampling of Single-Cycle THz Fields with Single-Photon Detectors
论文作者
论文摘要
用超短脉冲探针对Terahertz场的电流采样是一种直接测量THZ辐射电场的良好方法。该技术通常依靠平衡检测来记录THZ引起的双折射带来的光相移。因此，电流采样的敏感性受探针脉冲的射击噪声的限制，并且可以使用量子计量方法使用量子计量方法来改进，例如，中午为Heisenberg限制的相位估计。我们报告了使用单光子检测器和弱挤压真空场作为光学探针的实验。我们的方法通过使用相锁的单光子探测器的探针状态统计特性实现了场灵敏度，并为靶向量子增强THZ传感的进一步研究铺平了道路。
Electro-optical sampling of Terahertz fields with ultrashort pulsed probes is a well-established approach for directly measuring the electric field of THz radiation. This technique usually relies on balanced detection to record the optical phase shift brought by THz-induced birefringence. The sensitivity of electro-optical sampling is, therefore, limited by the shot noise of the probe pulse, and improvements could be achieved using quantum metrology approaches using, e.g., NOON states for Heisenberg-limited phase estimation. We report on our experiments on THz electro-optical sampling using single-photon detectors and a weak squeezed vacuum field as the optical probe. Our approach achieves field sensitivity limited by the probe state statistical properties using phase-locked single-photon detectors and paves the way for further studies targeting quantum-enhanced THz sensing.
