Roy J. Glauber

Roy J. Glauber was an American theoretical physicist who developed a quantum theory of optical coherence and shared the 2005 Nobel Prize in Physics.

Quantum optics: The study of light and its interactions with matter using quantum theory. Glauber helped establish this field’s modern theoretical foundations.
Glauber correlation function: A quantum correlation function formed from normally ordered products of electromagnetic field operators. These functions provide the central mathematical language of Glauber’s coherence theory.
Theodore Maiman: An American physicist who built the first functioning laser in 1960. The laser made the optical fields whose quantum coherence Glauber analyzed practically significant.
Laser: A device that produces light by stimulated emission, typically with strong directionality and coherence. Laser fields are often modeled using coherent states in Glauber’s framework.
Classical optics: The theory of light as a classical electromagnetic wave. Glauber’s quantum account explains photon correlations that classical wave statistics cannot capture.
Coherence (physics): The degree to which waves maintain a stable phase relationship across space or time. Glauber recast optical coherence in terms of quantum-mechanical field correlations.
Photodetection: The conversion of incident light into measurable electrical signals by a detector. Glauber related detection probabilities to quantum correlations of the incident field.
John Hall: An American physicist who shared the 2005 Nobel Prize in Physics for precision laser spectroscopy. Hall shared the prize with Glauber and helped develop frequency-comb spectroscopy.
Photon antibunching: A light-statistics effect in which detection events are less clustered than for coherent light. Glauber’s correlation functions provide a standard test for this nonclassical behavior.
Optical coherence tomography: An imaging method that uses low-coherence light to obtain depth-resolved images. Its use of coherence illustrates the broader experimental reach of optical coherence theory.

Linked from 4 pages