Relevant bibliographies by topics / Canonical and the associated perturbed quantum systems

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Canonical and the associated perturbed quantum systems'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Canonical and the associated perturbed quantum systems.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Canonical and the associated perturbed quantum systems"

1

CAVAGLIÀ, MARCO. "APPROXIMATE CANONICAL QUANTIZATION FOR COSMOLOGICAL MODELS." International Journal of Modern Physics D 08, no. 01 (February 1999): 101–15. http://dx.doi.org/10.1142/s0218271899000092.

Full text
Abstract:
In cosmology minisuperspace models are described by nonlinear time-reparametrization invariant systems with a finite number of degrees of freedom. Often these models are not explicitly integrable and cannot be quantized exactly. Having this in mind, we present a scheme for the (approximate) quantization of perturbed, nonintegrable, time-reparametrization invariant systems that uses (approximate) gauge invariant quantities. We apply the scheme to a couple of simple quantum cosmological models.
APA, Harvard, Vancouver, ISO, and other styles
2

Lupaşcu, A. I., and I. M. Popescu. "The time evolution of quantum systems with discrete energy spectra." Canadian Journal of Physics 64, no. 11 (November 1, 1986): 1546–50. http://dx.doi.org/10.1139/p86-275.

Full text
Abstract:
Using the method of matrix functions, we describe the time evolution of quantum systems with discrete energy spectra. The time evolution of the state vectors and expressions for the perturbed eigenfunctions and their associated projectors are obtained for an atom with n discrete levels. The particular cases n = 2 and n = 3 are presented; level crossing and nonexponential decay of coupled states are emphasized.
APA, Harvard, Vancouver, ISO, and other styles
3

Kallush, Shimshon, Aviv Aroch, and Ronnie Kosloff. "Quantifying the Unitary Generation of Coherence from Thermal Quantum Systems." Entropy 21, no. 8 (August 19, 2019): 810. http://dx.doi.org/10.3390/e21080810.

Full text
Abstract:
Coherence is associated with transient quantum states; in contrast, equilibrium thermal quantum systems have no coherence. We investigate the quantum control task of generating maximum coherence from an initial thermal state employing an external field. A completely controllable Hamiltonian is assumed allowing the generation of all possible unitary transformations. Optimizing the unitary control to achieve maximum coherence leads to a micro-canonical energy distribution on the diagonal energy representation. We demonstrate such a control scenario starting from a given Hamiltonian applying an e
APA, Harvard, Vancouver, ISO, and other styles
4

Bruce, S. A., and J. F. Diaz-Valdes. "Generalized Electromagnetic Fields Associated with the Hydrogen-Like Atom Problem." Zeitschrift für Naturforschung A 74, no. 1 (December 19, 2018): 43–50. http://dx.doi.org/10.1515/zna-2018-0372.

Full text
Abstract:
AbstractIt is known that the principle of minimal coupling in quantum mechanics determines a unique interaction form for a charged particle. By properly redefining the canonical commutation relation between (canonical) conjugate components of position and momentum of the particle, e.g. an electron, we restate the Dirac equation for the hydrogen-like atom problem incorporating a generalized minimal electromagnetic coupling. The corresponding interaction keeps the $1/\left|\mathbf{q}\right|$ dependence in both the scalar potential $V\left({\left|\mathbf{q}\right|}\right)$ and the vector potentia
APA, Harvard, Vancouver, ISO, and other styles
5

Sergi, Alessandro, Gabriel Hanna, Roberto Grimaudo, and Antonino Messina. "Quasi-Lie Brackets and the Breaking of Time-Translation Symmetry for Quantum Systems Embedded in Classical Baths." Symmetry 10, no. 10 (October 16, 2018): 518. http://dx.doi.org/10.3390/sym10100518.

Full text
Abstract:
Many open quantum systems encountered in both natural and synthetic situations are embedded in classical-like baths. Often, the bath degrees of freedom may be represented in terms of canonically conjugate coordinates, but in some cases they may require a non-canonical or non-Hamiltonian representation. Herein, we review an approach to the dynamics and statistical mechanics of quantum subsystems embedded in either non-canonical or non-Hamiltonian classical-like baths which is based on operator-valued quasi-probability functions. These functions typically evolve through the action of quasi-Lie b
APA, Harvard, Vancouver, ISO, and other styles
6

ALDAYA, V., M. CALIXTO, J. GUERRERO, and F. F. LÓPEZ-RUIZ. "SYMMETRIES OF NON-LINEAR SYSTEMS: GROUP APPROACH TO THEIR QUANTIZATION." International Journal of Geometric Methods in Modern Physics 08, no. 06 (September 2011): 1329–54. http://dx.doi.org/10.1142/s0219887811005713.

Full text
Abstract:
We report briefly on an approach to quantum theory entirely based on symmetry grounds which improves Geometric Quantization in some respects and provides an alternative to the canonical framework. The present scheme, being typically non-perturbative, is primarily intended for non-linear systems, although needless to say that finding the basic symmetry associated with a given (quantum) physical problem is in general a difficult task, which many times nearly emulates the complexity of finding the actual (classical) solutions. Apart from some interesting examples related to the electromagnetic an
APA, Harvard, Vancouver, ISO, and other styles
7

Izquierdo, Zoe Gonzalez, Itay Hen, and Tameem Albash. "Testing a Quantum Annealer as a Quantum Thermal Sampler." ACM Transactions on Quantum Computing 2, no. 2 (July 2021): 1–20. http://dx.doi.org/10.1145/3464456.

Full text
Abstract:
Motivated by recent experiments in which specific thermal properties of complex many-body systems were successfully reproduced on a commercially available quantum annealer, we examine the extent to which quantum annealing hardware can reliably sample from the thermal state in a specific basis associated with a target quantum Hamiltonian. We address this question by studying the diagonal thermal properties of the canonical one-dimensional transverse-field Ising model on a D-Wave 2000Q quantum annealing processor. We find that the quantum processor fails to produce the correct expectation values
APA, Harvard, Vancouver, ISO, and other styles
8

ALBEVERIO, SERGIO, HANNO GOTTSCHALK, and MINORU W. YOSHIDA. "SYSTEMS OF CLASSICAL PARTICLES IN THE GRAND CANONICAL ENSEMBLE, SCALING LIMITS AND QUANTUM FIELD THEORY." Reviews in Mathematical Physics 17, no. 02 (March 2005): 175–226. http://dx.doi.org/10.1142/s0129055x05002327.

Full text
Abstract:
Euclidean quantum fields obtained as solutions of stochastic partial pseudo differential equations driven by a Poisson white noise have paths given by locally integrable functions. This makes it possible to define a class of ultra-violet finite local interactions for these models (in any space-time dimension). The corresponding interacting Euclidean quantum fields can be identified with systems of classical "charged" particles in the grand canonical ensemble with an interaction given by a nonlinear energy density of the "static field" generated by the particles' charges via a "generalized Pois
APA, Harvard, Vancouver, ISO, and other styles
9

Ballesteros, Angel, Flaminia Giacomini, and Giulia Gubitosi. "The group structure of dynamical transformations between quantum reference frames." Quantum 5 (June 8, 2021): 470. http://dx.doi.org/10.22331/q-2021-06-08-470.

Full text
Abstract:
Recently, it was shown that when reference frames are associated to quantum systems, the transformation laws between such quantum reference frames need to be modified to take into account the quantum and dynamical features of the reference frames. This led to a relational description of the phase space variables of the quantum system of which the quantum reference frames are part of. While such transformations were shown to be symmetries of the system's Hamiltonian, the question remained unanswered as to whether they enjoy a group structure, similar to that of the Galilei group relating classi
APA, Harvard, Vancouver, ISO, and other styles
10

CASTELLANA, MICHELE, and GIOVANNI MONTANI. "BRST SYMMETRY TOWARDS THE GAUSS CONSTRAINT FOR GENERAL RELATIVITY." International Journal of Modern Physics A 23, no. 08 (March 30, 2008): 1218–21. http://dx.doi.org/10.1142/s0217751x08040093.

Full text
Abstract:
Quantization of systems with constraints can be carried on with several methods. In the Dirac's formulation the classical generators of gauge transformations are required to annihilate physical quantum states to ensure their gauge invariance. Carrying on BRST symmetry it is possible to get a condition on physical states which, differently from the Dirac's method, requires them to be invariant under the BRST transformation. Employing this method for the action of general relativity expressed in terms of the spin connection and tetrad fields with path integral methods, we construct the generator
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Canonical and the associated perturbed quantum systems"

1

Ahmed, Istiaque, and s3119889@student rmit edu au. "Canonical and Perturbed Quantum Potential-Well Problems: A Universal Function Approach." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080108.124715.

Full text
Abstract:
The limits of the current micro-scale electronics technology have been approaching rapidly. At nano-scale, however, the physical phenomena involved are fundamentally different than in micro-scale. Classical and semi-classical physical principles are no longer powerful enough or even valid to describe the phenomena involved. The rich and powerful concepts in quantum mechanics have become indispensable. There are several commercial software packages already available for modeling and simulation of the electrical, magnetic, and mechanical characteristics and properties of the nano-scale devices.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Canonical and the associated perturbed quantum systems"

1

Zinn-Justin, Jean. "Quantum statistical physics: Functional integration formalism." In Quantum Field Theory and Critical Phenomena, 64–89. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198834625.003.0004.

Full text
Abstract:
The functional integral representation of the density matrix at thermal equilibrium in non-relativistic quantum mechanics (QM) with many degrees of freedom, in the grand canonical formulation is introduced. In QM, Hamiltonians H(p,q) can be also expressed in terms of creation and annihilation operators, a method adapted to the study of perturbed harmonic oscillators. In the holomorphic formalism, quantum operators act by multiplication and differentiation on a vector space of analytic functions. Alternatively, they can also be represented by kernels, functions of complex variables that correspond in the classical limit to a complex parametrization of phase space. The formalism is adapted to the description of many-body boson systems. To this formalism corresponds a path integral representation of the density matrix at thermal equilibrium, where paths belong to complex spaces, instead of the more usual position–momentum phase space. A parallel formalism can be set up to describe systems with many fermion degrees of freedom, with Grassmann variables replacing complex variables. Both formalisms can be generalized to quantum gases of Bose and Fermi particles in the grand canonical formulation. Field integral representations of the corresponding quantum partition functions are derived.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography