Download or read book Decoherence Quantum classical Correspondence and Coherent Control in Molecular Dynamics microform written by Heekyung Han and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2004 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Next, quantum-classical correspondence in intrinsic decoherence dynamics is examined via purities and reduced density matrices in both the position and energy representations. Dependence of the correspondence on the nature of the coupling potentials and on the initial conditions are discussed. Decoherence effects on quantum and classical dynamics in reactive scattering problems are investigated. Through the study of dynamics of the isotopic analogues of the collinear H + H2 reaction and transmission over simple one-dimensional barrier potentials, the role of decoherence in improving quantum-classical correspondence is identified with suppressing resonance and tunnelling. Finally, the efficiency of 1+3 photon phase control in the presence of decoherence effects phase is carefully examined in several model cases which include from a population inversion in a two-level bound system to IBr photodissociation. Further, the ways to overcome the control loss caused by dephasing are discussed.
Download or read book Coherent Control Quantum Chaos and Decoherence in Molecular Dynamics microform written by Jiangbin Gong and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2001 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Control Quantum Chaos and Decoherence in Molecular Dynamics written by Jiangbin Gong and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensive coherent control of quantum chaotic diffusion in periodically kicked dynamics is demonstrated in both a paradigm of quantum chaos and molecular systems in pulsed microwave fields. The origin of the control in deviations from random matrix theory is identified, and the survival of the control in the presence of decoherence effects is studied. Next, a fundamental principle in quantum physics with regard to indistinguishability and interference between multiple pathways to the same final state is applied to the significant field of coherent control. Later, coherent control of diatom-diatom elastic and inelastic scattering of identical molecules is demonstrated by revealing an intriguing role of quantum entanglement in coherent control problems. Finally, quantum classical correspondence in conservative chaotic systems is carefully examined using a distribution function strategy. Further, the role of decoherence in improving the correspondence is computationally studied from several complementary perspectives.
Download or read book Coherent Control Quantum Chaos and Decoherence in Molecular Dynamics written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantum Control of Molecular Processes written by Moshe Shapiro and published by John Wiley & Sons. This book was released on 2012-01-10 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die 2. Auflage der umfassenden Behandlung eines modernen Ansatzes zur Steuerung natürlicher Prozesse in chemischer Physik, Teilchenphysik und Optik. Mit rd. 80% neuem Inhalt, u.a. zu Halbleitern, Nanostrukturen, Attosekundnprozessen, Spintronik und chiralen Prozessen.
Download or read book From Quantum to Classical Molecular Dynamics written by Christian Lubich and published by European Mathematical Society. This book was released on 2008 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum dynamics of molecules poses a variety of computational challenges that are presently at the forefront of research efforts in numerical analysis in a number of application areas: high-dimensional partial differential equations, multiple scales, highly oscillatory solutions, and geometric structures such as symplecticity and reversibility that are favourably preserved in discretizations. This text addresses such problems in quantum mechanics from the viewpoint of numerical analysis, illustrating them to a large extent on intermediate models between the Schrodinger equation of full many-body quantum dynamics and the Newtonian equations of classical molecular dynamics. The fruitful interplay between quantum dynamics and numerical analysis is emphasized.
Download or read book Molecular Quantum Dynamics written by Fabien Gatti and published by Springer Science & Business Media. This book was released on 2014-04-09 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on current applications of molecular quantum dynamics. Examples from all main subjects in the field, presented by the internationally renowned experts, illustrate the importance of the domain. Recent success in helping to understand experimental observations in fields like heterogeneous catalysis, photochemistry, reactive scattering, optical spectroscopy, or femto- and attosecond chemistry and spectroscopy underline that nuclear quantum mechanical effects affect many areas of chemical and physical research. In contrast to standard quantum chemistry calculations, where the nuclei are treated classically, molecular quantum dynamics can cover quantum mechanical effects in their motion. Many examples, ranging from fundamental to applied problems, are known today that are impacted by nuclear quantum mechanical effects, including phenomena like tunneling, zero point energy effects, or non-adiabatic transitions. Being important to correctly understand many observations in chemical, organic and biological systems, or for the understanding of molecular spectroscopy, the range of applications covered in this book comprises broad areas of science: from astrophysics and the physics and chemistry of the atmosphere, over elementary processes in chemistry, to biological processes (such as the first steps of photosynthesis or vision). Nevertheless, many researchers refrain from entering this domain. The book "Molecular Quantum Dynamics" offers them an accessible introduction. Although the calculation of large systems still presents a challenge - despite the considerable power of modern computers - new strategies have been developed to extend the studies to systems of increasing size. Such strategies are presented after a brief overview of the historical background. Strong emphasis is put on an educational presentation of the fundamental concepts, so that the reader can inform himself about the most important concepts, like eigenstates, wave packets, quantum mechanical resonances, entanglement, etc. The chosen examples highlight that high-level experiments and theory need to work closely together. This book thus is a must-read both for researchers working experimentally or theoretically in the concerned fields, and generally for anyone interested in the exciting world of molecular quantum dynamics.
Download or read book Principles of the Quantum Control of Molecular Processes written by Moshe Shapiro and published by . This book was released on 2003 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles and Applications of Quantum Contro Over the past fifteen years, significant developments have been made in utilizing quantum attributes of light and matter to assume unprecedented control over the dynamics of atomic and molecular systems. This growth reflects a confluence of factors including the maturation of quantum mechanics as a tool for chemistry and physics, the development of new laser devices increasing our ability to manipulate light, and the recognition that coherent laser light can be used to imprint information on atoms and molecules for practical purposes. Written by two of the world’s leading researchers in the field, Principles of the Quantum Control of Molecular Processes offers a systematic introduction to the fundamental principles of coherent control, and to the physics and chemistry necessary to master it Designed as both a resource for self-study and as a graduate textbook, this survey of the subject provides a step-by-step discussion of light-matter interactions along with coverage of such essential topics as: Molecular dynamics and control LI>The dynamics of photodissociation LI>Bimolecular collision processes LI>The control of chirality and asymmetric synthesis LI>Application of control using moderate and strong fields LI>Tuning the system and laser parameters to achieve optimal control LI>Decoherence and methods for countering it P>Both authoritative and comprehensive, this first in-depth treatment of coherent control is destined to become the standard reference in an increasingly influential field PAUL W. BRUMER, PhD, is University Professor–Theoretical Chemical Physics and holds the Roel Buck Chair in Chemical Physics at the University of Toronto. He received his BSc. from Brooklyn College and his PhD from Harvard University. MOSHE SHAPIRO, PhD, is the Jacques Mimran Professor of Chemical Physics at the Weizmann Institute of Science, Rehovot, Israel, and a Professor of Chemistry and Physics at the University of British Columbia. He received his BSc, MSc, and PhD from the Hebrew University of Jerusalem The authors are among the cofounders of the field of coherent control. They have published extensively on this and related subjects in chemical physics, and have received numerous awards and worldwide recognition for their research contributions.
Download or read book Decoherence Entanglement and Information Protection in Complex Quantum Systems written by Vladimir M. Akulin and published by Springer Science & Business Media. This book was released on 2005-08-10 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of articles on the contemporary status of quantum mechanics, dedicated to the fundamental issues of entanglement, decoherence, irreversibility, information processing, and control of quantum evolution, with a view of possible applications. It has multidisciplinary character and is addressed at a broad readership in physics, computer science, chemistry, and electrical engineering. It is written by the world-leading experts in pertinent fields such as quantum computing, atomic, molecular and optical physics, condensed matter physics, and statistical physics.
Download or read book Semiclassical Nonadiabatic Molecular Dynamics written by Chaoyuan Zhu and published by Springer. This book was released on 2024-09-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shows how to derive the simple and accurate semiclassical methods analytically and its applications to excited-state molecular dynamics and spectroscopy simulation with and without classical trajectories. It consists of eight chapters demonstrating interesting conical and intersystem-driven photochemical processes in complex systems targeting on large-scale ab initio direct nonadiabatic molecular dynamics. It also includes two chapters dealing with time-independent and time-dependent nonadiabatic molecular dynamics and clarifies the underline principle of Born–Oppenheimer approximation associated with coherence/decoherence quantum effects that have a wide range of applications in photochemistry and photophysics. This book is interesting and useful to a wide readership in the various fields of basic quantum chemistry and physics associated with large-scale excited-state simulation of nonadiabatic molecular dynamics and spectroscopy.
Download or read book Exploring Molecular Dynamics for Coherent Control written by Tamás Rozgonyi and published by . This book was released on 2003 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Control of Molecules written by Benjamin Lasorne and published by . This book was released on 2006 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling and Control of Quantum Decoherence in Molecules written by Wenxiang Hu and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "One of the greatest challenges for science and engineering in the 21st century is to harness the quantum features of matter to fuel the next technological revolution. The engine behind all quantum technologies is quantum coherence, which refers to the ability of matter to exist in quantum superpositions of states with well-defined relative phases. Such quantum coherence, however, is extraordinarily sensitive to decoherence (or quantum noise) processes that arise due to unavoidable interactions between the physical system of interest and its surroundings. Such decoherence is a fundamental limitation in our quest to explore and exploit the transformative quantum features of matter. In this thesis, we investigate the basic mechanisms that lead to electronic decoherence in molecules and, based on this understanding, develop viable strategies to control and mitigate the decoherence. Electronic decoherence arises due to electron-nuclear interactions and accompanies photoexcitation, electron transfer, or any other elementary chemical event that creates superpositions of electronic states. To capture the decoherence, we advocate for approaches in which the electron-nuclear dynamics is dealt with explicitly and fully quantum mechanically, as this enables detailed analyses of the elementary entangling interactions that lead to the decoherence. Specifically, in this thesis: (i) Using an exact numerical method we address basic questions about electronic ecoherence that are inaccessible to approaches where the nuclear dynamics is taken into account implicitly or approximately. This includes an investigation of the the influence of electron-electron interactions, initial state preparation and nuclear mass on the decoherence. (ii) We go beyond pure dephasing models of the decoherence, and quantify the role of electronic transitions in electronic decoherence. (iii) We develop a scheme for the laser control of electronic decoherence dynamics based on photoexcitation of matter with few cycle laser pulses. Last, (iv) we demonstrate the possibility to enhance quantum coherence time scale in molecules by hybridizing their electronic levels with light in the context of optical cavities. As such, this thesis advances the theory, simulation and quantum control of electronic decoherence."--Pages x-xi.
Download or read book Development of Mixed Quantum classical Methods for Coherent Control and Ultrafast Spectroscopy in Complex Systems written by Jens Petersen and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantum Classical Molecular Dynamics as an Approximation to Full Quantum Dynamics written by Folkmar A. Bornemann and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "This paper presents a mathematical derivation of a model for quantum-classical molecular dynamics (QCMD) as a partial classical limit of the full Schrödinger equation. This limit is achieved in two steps: separation of the full wavefunction and short wave asymptotics for its 'classical' part. Both steps can be rigorously justified under certain smallness assumptions. Moreover, the results imply that neither the time-dependent self-consistent field method nor mixed quantum-semi-classical models lead to better approximations than QCMD since they depend on the separation step, too. On the other hand, the theory leads to a characterization of the critical situations in which the models are in danger of largely deviating from the solution of the full Schrödinger equation. These critical situations are exemplified in an illustrative numerical simulation: the collinear collision of an Argon atom with a harmonic quantum oscillator."
Download or read book Coherent Control of Molecular Processes in the Condensed Phase written by Cyrille Lavigne and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent control schemes are interference-based procedures for the control of quantum mechanical systems informed by a careful analysis of the physical conditions on interference. In this thesis, the coherent control approach is applied to experimental phase control in the condensed phase. Specifically, coherent control schemes are proposed as mechanisms for experimental manifestations of phase interference. First, a simulation of a ``black box'' feedback control experiment using realistic pulse shaping is shown to automatically find a specific, previously devised coherent control scheme. Qualitative features of experiments performed in this way are reproduced. Second, an analysis of interference in one-photon phase control yields an upper bound on the duration of phase effects. One-photon phase control was previously shown to be possible only over the transient (as opposed to steady-state) value of observables. The bound described here quantifies this statement and provide a rigorous definition of ``transient'' control. We propose that phase control beyond this bound, as reported in a number of weak-field experimental and computational studies, is the result of previously unaccounted for multiphoton effects. Third, we analyze a recent experiment showing phase control of the macroscopic current emanating from living brain cells photostimulated by two-photon absorption. We propose mechanisms for the phase dependence of the current that operate over fifteen orders of magnitude in time, from the femtosecond dynamics of light-matter interactions to the macroscopic dynamics of neuron current. Significantly, coherent control is extended to the case of systems repeatedly interacting with pulses of light; we show that macroscopic control is obtained, in this case, from the multi-pulse accumulation of small phase effects. Research into multiphoton control led to the development of a novel algorithm to compute higher order perturbation theory integrals, presented in the final chapter of this thesis. The Fourier-Laplace Inversion of the Perturbation Theory (FLIPT) method is a highly efficient, numerically exact, ``black box'' integration algorithm. The FLIPT method exploits the specific structure of the multidimensional perturbation theory integrals to obtain an exponential improvement in performance over standard quadrature.
Download or read book Elements of Quantum Optics written by Pierre Meystre and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: "This is a book that should be found in any physics library. It is extremely useful for all graduate students, Ph.D. students and researchers interested in the quantum physics of light." Optics & Photonics News
