Open AccessTime-asymmetric quantum fluctuations in intensity-amplitude correlation for a driven cavity QED system
Author(s) -
Teng Zhao,
Ze-an Peng,
Guoqing Yang,
Guangming Huang,
Gaoxiang Li
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.377815
Subject(s) - physics , homodyne detection , amplitude , intensity (physics) , asymmetry , gaussian , photon , optics , correlation function (quantum field theory) , quantum electrodynamics , quantum fluctuation , quantum mechanics , quantum , dielectric
The intensity-amplitude correlation functions for a driven cavity QED system with two non-identical atoms are investigated in this paper. With the support of conditional homodyne detection, one can detect the time-dependent intensity-amplitude correlation functions experimentally. We find time-asymmetry in this correlation when the driving field is tuned to be resonant with the two-photon excitation state, which brings non-Gaussian fluctuations. The physical origin of these phenomena is the distinction of the third-order moment based on complete-collapse and partial-collapse, which corresponds to the measuring sequence of the intensity and amplitude. Finally, we also examined the nonclassical features of the system, which always exhibits photon bunching. The squeezing occurs in the region of weak driving and disappears with the increase of driving strength. Hence, a new classical inequality based on the technique of homodyne cross-correlation measurement is introduced to determine the nonclassicality of the non-Gaussian system in the region of unsqueezing.