Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review Letters

Quantum noise-correlated operation of electrically coupled semiconductor light emitters

P. J. Edwards, Geoff Pollard

Published Sep 21, 1992• 45 citations
Publisher

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.

DOI
10.1103/physrevlett.69.1757

Related papers

Generation of intensity-correlated twin beams using series-coupled semiconductor lasers

Gunnar G. Bjork

The low-frequency intensity noise of high-quantum-efficiency lasers or light-emitting diodes (LED's) is dominated by the pump noise. By coupling two or more semiconductor lasers (or LED's) in series with a current source, the pump noise of the two lasers will be equal, and the intensity noise of the lasers will be highly correlated. It is shown that one may generate sub-Poissonian light by measuring the intensity fluctuations of one of the beams and feeding back (or forward) the information to regulate the other photon beam. The generation scheme is shown to have much in common with intensity-correlated twin beam generation from nondegenerate optical parametric oscillators.

Physical Review A•Jun 1, 1992•17 citations

Violation of a classical Cauchy-Schwarz inequality in photon noise spectra

Yongqing Li, Paul J Edwards, Xu Guang Huang +1 more

A Cauchy-Schwarz inequality in photon noise spectra is derived and discussed for macroscopic fields of light. Violation of this Cauchy-Schwarz inequality is demonstrated experimentally in quantum noise-correlated light beams radiated from a pair of electrically coupled light-emitting diodes. Our measurements directly demonstrate that the violation of this Cauchy-Schwarz inequality can be observed in the absence of sub-shot noise fluctuations in either the single-beam intensity or the dual-beam intensity difference. Therefore, the dual-beam quantum correlation condition required for the violation of this Cauchy-Schwarz inequality is not associated with sub-shot noise fluctuations.

Journal of Optics B Quantum and Semiclassical Optics•May 24, 2000•8 citations

Suppression of closed-loop photocurrent fluctuation below amplifier dark noise

Jianping Yin, Weijian Gao, Yifu Zhu +1 more

Suppression of the closed-loop photocurrent fluctuation below the amplifier dark noise was observed in both a negative-feedback light-emitting diode and a laser diode. We apply the concept of an anticorrelation light state proposed by Masalov et al to analyze the anticorrelation effect between the measured photocurrent fluctuation and the amplifier dark noise, which successfully explains our experimental observations. Our theoretical analysis also yields the squeezed spectrum of the light intensity fluctuation in the loop and the correlation coefficient between the photocurrent and the amplifier noise.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jul 19, 1999•0 citations

Light emitting diode sub-Poissonian light source

P. R. Tapster, John G. Rarity, J.S. Satchell

We drive a high-efficiency gallium arsenide light emitting diode (LED) with a low-noise current and measure the noise in the detected photocurrent from a high-quantum-efficiency silicon photodiode collecting most of the emitted light. The drive current is obtained from a resistor in series with a low-noise voltage supply. The Johnson noise in the current is much less than shot noise whenever the voltage across the resistor is large compared with 50 mV (2kT/e at room temperature). The LED converts electrons to photons directly with some efficiency η.

Annual Meeting Optical Society of America•Jan 1, 1987•0 citations

Intensity correlations of a noise-driven diode laser

G. T. Foster, S. L. Mielke, Luis A. Orozco

We couple noise into the driving current of a laser diode to produce correlated light. We characterize the intensity correlations of the laser with two different techniques: two-detector photon coincidence and analysis of the photocurrent from a single detector. The light exhibits bunching with a magnitude and characteristic time set by the bandwidth and the amplitude of the noise modulating the laser driving current. A simple model based on amplitude modulation of the laser intensity agrees with the measured correlation functions. The bunched light can be used to probe systems that are sensitive to intensity correlations.

Journal of the Optical Society of America B•Nov 1, 1998•10 citations

Two-photon emission and correlations from a superlattice-based superconducting light-emitting diode

Shlomi Bouscher, Dmitry Panna, Krishna Balasubramanian +5 more

We demonstrate evidence of two-photon emission and photon pair correlations, resulting from injected Cooper-pairs in superconductor-semiconductor structures. Such structures can be utilized for multiple applications including enhanced two-photon gain, electrically-driven entangled-photon generation and Bell-state analyzers.

•Jan 1, 2023•0 citations
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.
The low-frequency intensity noise of high-quantum-efficiency lasers or light-emitting diodes (LED's) is dominated by the pump noise. By coupling two or more semiconductor lasers (or LED's) in series with a current source, the pump noise of the two lasers will be equal, and the intensity noise of the lasers will be highly correlated. It is shown that one may generate sub-Poissonian light by measuring the intensity fluctuations of one of the beams and feeding back (or forward) the information to regulate the other photon beam. The generation scheme is shown to have much in common with intensity-correlated twin beam generation from nondegenerate optical parametric oscillators.
A Cauchy-Schwarz inequality in photon noise spectra is derived and discussed for macroscopic fields of light. Violation of this Cauchy-Schwarz inequality is demonstrated experimentally in quantum noise-correlated light beams radiated from a pair of electrically coupled light-emitting diodes. Our measurements directly demonstrate that the violation of this Cauchy-Schwarz inequality can be observed in the absence of sub-shot noise fluctuations in either the single-beam intensity or the dual-beam intensity difference. Therefore, the dual-beam quantum correlation condition required for the violation of this Cauchy-Schwarz inequality is not associated with sub-shot noise fluctuations.
Suppression of the closed-loop photocurrent fluctuation below the amplifier dark noise was observed in both a negative-feedback light-emitting diode and a laser diode. We apply the concept of an anticorrelation light state proposed by Masalov et al to analyze the anticorrelation effect between the measured photocurrent fluctuation and the amplifier dark noise, which successfully explains our experimental observations. Our theoretical analysis also yields the squeezed spectrum of the light intensity fluctuation in the loop and the correlation coefficient between the photocurrent and the amplifier noise.
We drive a high-efficiency gallium arsenide light emitting diode (LED) with a low-noise current and measure the noise in the detected photocurrent from a high-quantum-efficiency silicon photodiode collecting most of the emitted light. The drive current is obtained from a resistor in series with a low-noise voltage supply. The Johnson noise in the current is much less than shot noise whenever the voltage across the resistor is large compared with 50 mV (2kT/e at room temperature). The LED converts electrons to photons directly with some efficiency η.
We couple noise into the driving current of a laser diode to produce correlated light. We characterize the intensity correlations of the laser with two different techniques: two-detector photon coincidence and analysis of the photocurrent from a single detector. The light exhibits bunching with a magnitude and characteristic time set by the bandwidth and the amplitude of the noise modulating the laser driving current. A simple model based on amplitude modulation of the laser intensity agrees with the measured correlation functions. The bunched light can be used to probe systems that are sensitive to intensity correlations.