Quantum noise-correlated operation of electrically coupled semiconductor light emitters

Abstract

Electrically coupled light-emitting diodes have been configured to demonstrate multiple light beams with correlated sub-shot-noise intensity fluctuations. Photocurrent covariance measurements of the two light beams from a pair of series-connected diodes show a positive correlation, similar to that observed with nonlinear crystal down-converters. Shunt-connected diodes are shown to generate negatively correlated light beams.