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Journal of Modern Optics

Improved photon-number squeezing in light-emitting diodes

F. Wölfl, G.-M. Schucan, A. M. Fox, J.F. Ryan

Published Jun 1, 1998• 5 citations
Publisher

Abstract

We report photon-number squeezing measurements on high-efficiency double heterojunction AlGaAs infrared light-emitting diodes. The overall current-to-current efficiency was 0.25 at room temperature and 0.40 at 77 K, resulting in a noise reduction below the Standard Quantum Limit of 1.1 dB and 2.0dB, respectively. In addition, photocurrent correlation experiments were carried out with 2 or 3 LEDs in series, revealing a normalized correlation coefficient of 0.25 at room temperature and 0.40 at 77 K.

DOI
10.1080/09500349808230905

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We report photon-number squeezing measurements on high-efficiency double heterojunction AlGaAs infrared light-emitting diodes. The overall current-to-current efficiency was 0.25 at room temperature and 0.40 at 77 K, resulting in a noise reduction below the Standard Quantum Limit of 1.1 dB and 2.0dB, respectively. In addition, photocurrent correlation experiments were carried out with 2 or 3 LEDs in series, revealing a normalized correlation coefficient of 0.25 at room temperature and 0.40 at 77 K.
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The generation of photon-number squeezed states or sub-Poissonian light using semiconductor devices is especially attractive because of its simple experimental configuration, small energy consumption, and the possibility of large amplitude noise reduction by using high quantum efficiency devices. Recently, 3 dB squeezing at liquid nitrogen temperature and 80 MHz (3 dB roll-off bandwidth) squeezing at room temperature were reported by using a light-emitting diode. In this paper, we demonstrate over 200 MHz squeezing at 48 K.
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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.