Squeezed-light source for the superresolving microscopy

Quantum fluctuations in superresolving microscopy with squeezed light

We numerically investigate the role of quantum fluctuations in superresolution of optical objects. First, we confirm that when quantum fluctuations are not taken into account, one can easily improve the resolution by one order of magnitude beyond the diffraction limit. Then we investigate the standard quantum limit of superresolution which is achieved for illumination of an object by a light wave in a coherent state. We demonstrate that this limit can be beyond the diffraction limit. Finally, we show that further improvement of superresolution beyond the standard quantum limit is possible usin…

基于空间模式解复用的超分辨光学标尺：用于布朗运动下演化的系统

Superresolving optical ruler based on spatial mode demultiplexing for systems evolving under Brownian motion

本文研究布朗运动下双弱非相干源系统的自适应SPADE测量精度极限，发现瑞利诅咒存在但SPADE优于直接成像，通过调整测量时间可达近最优精度。

Superresolution microscopy of optical fields using tweezer-trapped single atoms

We realize a scanning probe microscope using single trapped $^{87}$Rb atoms to measure optical fields with subwavelength spatial resolution. Our microscope operates by detecting fluorescence from a single atom driven by near-resonant light and determining the ac Stark shift of an atomic transition from other local optical fields via the change in the fluorescence rate. We benchmark the microscope by measuring two standing-wave Gaussian modes of a Fabry-Pérot resonator with optical wavelengths of 1560 nm and 781 nm. We attain a spatial resolution of 300 nm, which is superresolving compared to t…

明亮脉冲压缩光用于量子增强的高精度显微镜

Bright Pulsed Squeezed Light for Quantum-Enhanced Precision Microscopy

本研究提出利用波导中的χ²光学参量放大过程生成高亮脉冲压缩光，实现量子增强的高精度显微镜技术。

Ab-initio Quantum Enhanced Optical Phase Estimation Using Real-time Feedback Control

Optical phase estimation is a vital measurement primitive that is used to perform accurate measurements of various physical quantities like length, velocity and displacements. The precision of such measurements can be largely enhanced by the use of entangled or squeezed states of light as demonstrated in a variety of different optical systems. Most of these accounts however deal with the measurement of a very small shift of an already known phase, which is in stark contrast to ab-initio phase estimation where the initial phase is unknown. Here we report on the realization of a quantum enhanced…

Smart Quantum Statistical Imaging beyond the Abbe-Rayleigh Criterion

The manifestation of the wave nature of light through diffraction imposes limits on the resolution of optical imaging. For over a century, the Abbe-Rayleigh criterion has been utilized to assess the spatial resolution limits of optical instruments. Recently, there has been an enormous impetus in overcoming the Abbe-Rayleigh resolution limit by projecting target light beams onto spatial modes. These conventional schemes for superresolution rely on a series of spatial projective measurements to pick up phase information that is used to boost the spatial resolution of optical systems. Unfortunate…