Related Experiment Video
Updated: May 30, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Detection of a semitransparent object with no exchange of quanta
Abstract:
In this paper, we theoretically analyze the optimization of a Fabry-Pérot cavity for the purpose of detecting partially absorbing objects placed inside without photon exchange. Utilizing the input-output formalism, we quantitatively relate the probability of correctly inferring the presence or absence of the object to the probability of avoiding absorption. We show that, if the cavity decay rate due to absorption by the object is comparable to that of the empty cavity and to the object-induced detuning, the product of the two probabilities is maximized by an undercoupled cavity, in which case detection in transmission is favorable to that in reflection. These results are contrary to the case of a perfect absorber, thus adding to the body of work pertaining to different interaction-free measurement schemes and providing insight into optimizing their efficiency when detecting realistic objects.
Related Concept Videos
Scanning Electron Microscopy
Fundamental Principles
Accelerated...
Photoluminescence: Applications
UV–Vis Spectroscopy: Molecular Electronic Transitions

