Squeezing in photon-number fluctuations due to backward pump process without high impedance-noise-suppression in a light-emitting-diode

Summary form only given. Among a variety of schemes for nonclassical light generation, the generation of sub-Poissonian photon-states with semiconductor lasers or light-emitting-diodes (LEDs) has been attracting much attention, primarily from engineering point of view. In this talk, we shall present our experimental results, manifesting substantial noise suppression of output photon fluxes below standard quantum limit (SQL) level from a single LED surprisingly without recourse to high-impedance circuit at room temperature. The observed squeezing is interpreted semiquantitatively in terms of our new model including effects of microscopic backward pump process.