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This course-based monograph introduces the reader to the theory of continuous measurements in quantum mechanics and provides some benchmark applications. The approach chosen, quantum trajectory theory, is based on the stochastic Schrödinger and master equations, which determine the evolution of the a-posteriori state of a continuously observed quantum system and give the distribution of the measurement output. The present introduction is restricted to finite-dimensional quantum systems and diffusive outputs. Two appendices introduce the tools of probability theory and quantum measurement theory which are needed for the theoretical developments in the first part of the book. First, the basic equations of quantum trajectory theory are introduced, with all their mathematical properties, starting from the existence and uniqueness of their solutions. This makes the text also suitable for other applications of the same stochastic differential equations in different fields such as simulations of master equations or dynamical reduction theories. In the next step the equivalence between the stochastic approach and the theory of continuous measurements is demonstrated. To conclude the theoretical exposition, the properties of the output of the continuous measurement are analyzed in detail. This is a stochastic process with its own distribution, and the reader will learn how to compute physical quantities such as its moments and its spectrum. In particular this last concept is introduced with clear and explicit reference to the measurement process. The two-level atom is used as the basic prototype to illustrate the theory in a concrete application. Quantum phenomena appearing in the spectrum of the fluorescence light, such as Mollow’s triplet structure, squeezing of the fluorescence light, and the linewidth narrowing, are presented. Last but not least, the theory of quantum continuous measurements is the natural starting point to develop a feedback control theory in continuous time for quantum systems. The two-level atom is again used to introduce and study an example of feedback based on the observed output.
Quantum trajectories --- Atomic Physics --- Physics --- Physical Sciences & Mathematics --- Quantum theory. --- Quantum trajectories. --- Relativity (Physics) --- Trajectories, Quantum --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Physics. --- Applied mathematics. --- Engineering mathematics. --- Quantum physics. --- Optics. --- Electrodynamics. --- Quantum optics. --- Statistical physics. --- Dynamical systems. --- Optics and Electrodynamics. --- Applications of Mathematics. --- Quantum Physics. --- Mathematical Methods in Physics. --- Quantum Optics. --- Statistical Physics, Dynamical Systems and Complexity. --- Gravitation --- Nonrelativistic quantum mechanics --- Space and time --- Hydrodynamics --- Quantum field theory --- Mechanics --- Thermodynamics --- Mathematics. --- Mathematical physics. --- Classical Electrodynamics. --- Complex Systems. --- Physical mathematics --- Math --- Science --- Mathematics --- Dynamical systems --- Kinetics --- Mechanics, Analytic --- Force and energy --- Statics --- Mathematical statistics --- Optics --- Photons --- Quantum theory --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Engineering --- Engineering analysis --- Mathematical analysis --- Light --- Statistical methods
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Remarkable progress has recently been made in the application of quantumtrajectories as the computational tool for solving quantum mechanical problems. This is the first book to present these developments in the broader context of the hydrodynamical formulation of quantum dynamics. In addition to a thorough discussion of the quantum trajectory equations of motion, there is considerable material that deals with phase space dynamics, adaptive moving grids, electronic energy transfer, and trajectories for stationary states. On the pedagogical side, a number of sections of this book will be accessible to students who have had an introductory quantum mechanics course. There is also considerable material for advanced researchers, and chapters in the book cover both methodology and applications. The book will be useful to students and researchers in physics, chemistry, applied math, and computational dynamics. "This excellent book covers a wide range of topics associated with Quantum Hydrodynamics. It's an excellent survey of the history, current state-of-the-field, and future research directions." Brian Kendrick,Theoretical Division, Los Alamos National Laboratory, Los Alamos,NM, USA The book is unique in that it addresses with equal expertise, computational methodology and theoretical connections at the interface between de Broglie-Bohm theory and phase space moment methods.A highly didactic text, to be recommended to graduate students and researchers in physics and chemistry. Irene Burghardt,Departement de chimie, Ecole Normale Superieure, Paris, France Wyatt shows how one can use the ideas drawn from Bohm's interpretation to develop new and efficient computational methods for both time dependent and time independent quantum mechanics.This is THE definitive text on practical Bohmian mechanics. Eric Bittner,Department of Chemistry, University of Houston, Tx, USA .
Hydrodynamics. --- Quantum trajectories. --- Lagrangian functions. --- Schrödinger equation. --- Quantum field theory. --- Relativistic quantum field theory --- Field theory (Physics) --- Quantum theory --- Relativity (Physics) --- Equation, Schrödinger --- Schrödinger wave equation --- Differential equations, Partial --- Particles (Nuclear physics) --- Wave mechanics --- WKB approximation --- Functions, Lagrangian --- Calculus of variations --- Dynamics --- Mathematical optimization --- Trajectories, Quantum --- Hydrodynamics --- Quantum field theory --- Fluid dynamics --- Computer science --- Quantum theory. --- Chemistry, Physical organic. --- Hydraulic engineering. --- Computational Mathematics and Numerical Analysis. --- Quantum Physics. --- Atomic, Molecular, Optical and Plasma Physics. --- Fluid- and Aerodynamics. --- Physical Chemistry. --- Engineering Fluid Dynamics. --- Mathematics. --- Engineering, Hydraulic --- Engineering --- Fluid mechanics --- Hydraulics --- Shore protection --- Chemistry, Physical organic --- Chemistry, Organic --- Chemistry, Physical and theoretical --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Physics --- Mechanics --- Thermodynamics --- Computer mathematics --- Discrete mathematics --- Electronic data processing --- Mathematics --- Computer mathematics. --- Quantum physics. --- Atoms. --- Physics. --- Fluids. --- Physical chemistry. --- Fluid mechanics. --- Hydromechanics --- Continuum mechanics --- Chemistry, Theoretical --- Physical chemistry --- Theoretical chemistry --- Chemistry --- Hydrostatics --- Permeability --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Matter --- Stereochemistry --- Constitution --- Schrodinger equation.
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