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JournalNX - A Multidisciplinary Peer Reviewed Journal

DETECTION AND MODULATION OF OPTICAL QUANTUM GENERATORS

Khudoiberdiyeva Mavluda Ibrayimovna, Ismailov Botir Berdiyorovich

Published May 27, 2021• 0 citations
Publisher

Abstract

This article discusses optical quantum generators, their types, detection and modulation, as well as their history and mechanism of operation.
DOI
10.17605/osf.io/c2f7q

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This thesis investigates the result of modulation schemes in electromagnetically induced transparency (EIT) in rubidium vapor. Through the process of EIT, a control beam can be used to change the optical properties of a medium experienced by a probe field, generating a transparency window. The corresponding change in index of refraction results in slowed group velocity while the beam propagates through the medium. Modulation is used to transmit a message signal through a medium. In classical systems, this entails converting data into a radio frequency by adding a message to an electronic or optical carrier signal. The properties of EIT, light-slowing, and their impacts on a probe pulse with modulation will be confirmed through a detailed semi-classical analysis and by experimental observation.
We employ a time-dependent Hamiltonian and a time-dependent canonical transformation to investigate the possibility of reduction of quantum noise below the vacuum limit by electro-optical modulation of a coherent light field. It is shown that the amount of noise reduction depends on the time variation of the bias field in the electro-optical effect. Some illustrative examples yielding explicit results are considered, the present scenery constituting a practical realization of some theoretical models in the literature.