Quantum coherence in laser and micromaser systems.
Item
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Title
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Quantum coherence in laser and micromaser systems.
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Identifier
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AAI9605574
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identifier
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9605574
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Creator
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Bogar, Pal.
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Contributor
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Adviser: Janos A. Bergou
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Date
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1995
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Optics
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Abstract
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Quantum coherence effects in lasers and micromasers are studied theoretically. First, we investigate the laser operation when coherences between various levels of the pumping three-level atoms are introduced by some external means. We find that, in the case of closely spaced lower levels {dollar}(\Lambda{dollar}-configuration), zero-threshold lasing without inversion can be achieved with quantum noise reduced to the level of that of an ideal coherent state. Multistable regimes, phase locking, and controlled competition between the modes are found when the, thus far, single-mode operation is extended to a two-mode one.;In the second line of research, we consider two micromasers coupled in series by sharing a common pumping atomic beam. Significant modifications in the behavior of the second field are found due to the atomic coherence prepared in the first cavity, together with the build-up of correlation and phase locking between the two fields. We also study the evolution of the quantum state of the nonlocal two-field system in the two schemes where the final states of the atoms are measured conditionally or nonselectively. It is found that arbitrary steady state entanglement of the two nonlocal fields can be engineered in the form of entangled trapping states. These quantum states are experimentally feasible in the short-time transient regime when dissipation does not exceed a certain threshold.;We also show that the correlation between the nonlocal fields can be translated into a correlation between spatially separated atomic beams. These entangled atoms can have several applications such as studying the effect of interatomic correlations in lasers and micromasers, quantum computing, teleportation, or tests of the local realistic theories. However, we specifically discuss here their use in experimentally feasible tests of complementarity applying Ramsey's atomic interferometry. We find that the correlation between the atoms provides us with "Welcher Weg" information resulting in a destruction of the interference fringes without leading to Heisenberg's uncertainty principle. Manipulation of information results in a generalized version of the "quantum eraser.".
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
