AUTHOR=Peng Tao , Zhao Xingchen , Shih Yanhua , Scully Marlan O.
TITLE=High Order Coherence Functions and Spectral Distributions as Given by the Scully-Lamb Quantum Theory of the Laser
JOURNAL=Frontiers in Physics
VOLUME=9
YEAR=2021
URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.657333
DOI=10.3389/fphy.2021.657333
ISSN=2296-424X
ABSTRACT=We propose and demonstrate a method for measuring the time evolution of the off-diagonal elements ρ_{n,n+k}(t) of the reduced density matrix obtained from the quantum theory of the laser. The decay rates of the off-diagonal matrix element ρ_{n,n+k}(t) (k = 2,3) are measured for the first time and compared with that of ρ_{n,n+1}(t), which corresponds to the linewidth of the laser. The experimental results agree with the Scully-Lamb quantum theory of the laser.