Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise

We study several aspects of two-photon correlation of an optically driven extended medium (amplifier) with parametric down-conversion (PDC) scheme and three-level cascade scheme. The correlation for the PDC scheme is modeled by coupled parametric equations with constant self-coupling and cross coupl...

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Main Authors: Ooi, Chong Heng Raymond, Scully, M.O.
Format: Article
Published: 2007
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Online Access:http://eprints.um.edu.my/7940/
http://pra.aps.org/abstract/PRA/v76/i4/e043822
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spelling my.um.eprints.79402019-10-09T00:50:33Z http://eprints.um.edu.my/7940/ Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise Ooi, Chong Heng Raymond Scully, M.O. QC Physics We study several aspects of two-photon correlation of an optically driven extended medium (amplifier) with parametric down-conversion (PDC) scheme and three-level cascade scheme. The correlation for the PDC scheme is modeled by coupled parametric equations with constant self-coupling and cross coupling coefficients. This provides simple physical insights to how the correlation profile depends on the sign and magnitude of the coefficients in the presence of propagation group delay between signal and idler photons. The results with constant coefficients are related to the results of the driven three-level cascade scheme obtained from quantum Langevin-Maxwell's equations. The correlation transforms from bunching to antibunching as the pump field increases. Cauchy-Schwartz inequality is violated for all time delay in the case of off-resonant pump, showing nonclassical correlation. We verify that the correlation obtained without noise operators is qualitatively correct regardless of the optical density, especially for large detuning. We also discuss the interesting physics behind antibunching and oscillations found in the reverse correlation. 2007 Article PeerReviewed Ooi, Chong Heng Raymond and Scully, M.O. (2007) Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise. Physical Review A, 76 (4). ISSN 1050-2947 http://pra.aps.org/abstract/PRA/v76/i4/e043822 10.1103/PhysRevA.76.043822
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QC Physics
spellingShingle QC Physics
Ooi, Chong Heng Raymond
Scully, M.O.
Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise
description We study several aspects of two-photon correlation of an optically driven extended medium (amplifier) with parametric down-conversion (PDC) scheme and three-level cascade scheme. The correlation for the PDC scheme is modeled by coupled parametric equations with constant self-coupling and cross coupling coefficients. This provides simple physical insights to how the correlation profile depends on the sign and magnitude of the coefficients in the presence of propagation group delay between signal and idler photons. The results with constant coefficients are related to the results of the driven three-level cascade scheme obtained from quantum Langevin-Maxwell's equations. The correlation transforms from bunching to antibunching as the pump field increases. Cauchy-Schwartz inequality is violated for all time delay in the case of off-resonant pump, showing nonclassical correlation. We verify that the correlation obtained without noise operators is qualitatively correct regardless of the optical density, especially for large detuning. We also discuss the interesting physics behind antibunching and oscillations found in the reverse correlation.
format Article
author Ooi, Chong Heng Raymond
Scully, M.O.
author_facet Ooi, Chong Heng Raymond
Scully, M.O.
author_sort Ooi, Chong Heng Raymond
title Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise
title_short Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise
title_full Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise
title_fullStr Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise
title_full_unstemmed Two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting Langevin noise
title_sort two-photon correlation in a cascade amplifier: propagation effects via a simple model, nonclassical regimes, and validity of neglecting langevin noise
publishDate 2007
url http://eprints.um.edu.my/7940/
http://pra.aps.org/abstract/PRA/v76/i4/e043822
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