The Stoner-Wohlfarth model of Ferromagnetism: Static properties
... as a classical signal input-output problem. The input-output characteristic M (H) is that of a peculiar non-linear filter except at very low fields where M is simply proportional to H. A simple illustration of non-linearity is to observe the output as a square signal whereas the input is a sinusoida ...
... as a classical signal input-output problem. The input-output characteristic M (H) is that of a peculiar non-linear filter except at very low fields where M is simply proportional to H. A simple illustration of non-linearity is to observe the output as a square signal whereas the input is a sinusoida ...
Quantum State Transfer via Noisy Photonic and Phononic Waveguides
... Sensitivity to coupling functions κ 1;2 ðtÞ.—In Figs. 2(a) and 2(b), we study the sensitivity of QST to the functions κ1;2 ðtÞ for the minimal model of nodes represented by cavities. Figure 2(a) shows the effect of the protocol duration T ¼ tf − ti which, in the ideal case, is required to fulfill T ...
... Sensitivity to coupling functions κ 1;2 ðtÞ.—In Figs. 2(a) and 2(b), we study the sensitivity of QST to the functions κ1;2 ðtÞ for the minimal model of nodes represented by cavities. Figure 2(a) shows the effect of the protocol duration T ¼ tf − ti which, in the ideal case, is required to fulfill T ...
QUANTUM ESTIMATION FOR QUANTUM TECHNOLOGY 1
... space H and labeled by a parameter λ living on a d-dimensional manifold M, with the mapping λ #→ $λ providing a coordinate system. This is sometimes referred to as a quantum statistical model. The parameter λ does not, in general, correspond to a quantum observable and our aim is to estimate its val ...
... space H and labeled by a parameter λ living on a d-dimensional manifold M, with the mapping λ #→ $λ providing a coordinate system. This is sometimes referred to as a quantum statistical model. The parameter λ does not, in general, correspond to a quantum observable and our aim is to estimate its val ...
The Spectrum of the Hydrogen Atom
... In Schrödinger’s interpretation of quantum mechanics, a system is described by a wavefunction, ψ, which contains “all the information we have about the state of a physical system” (Schrödinger and Bitbol, 1995, page 70). A wavefunction is given by the superposition of the eigenstates for an operat ...
... In Schrödinger’s interpretation of quantum mechanics, a system is described by a wavefunction, ψ, which contains “all the information we have about the state of a physical system” (Schrödinger and Bitbol, 1995, page 70). A wavefunction is given by the superposition of the eigenstates for an operat ...
One Force of Nature
... slowed down to a stop. The current explanation of the annihilation process implies that it was a wasteful event. The new theory says it wasn't wasteful because the products of the annihilation were recycled - we now have experimental proof for the recycling process. The upshot of this is that proton ...
... slowed down to a stop. The current explanation of the annihilation process implies that it was a wasteful event. The new theory says it wasn't wasteful because the products of the annihilation were recycled - we now have experimental proof for the recycling process. The upshot of this is that proton ...
Magnetism: Models and Mechanisms - cond
... of the crystal field, a magnetic ion in a crystal might lose, totally or partially, its spin, angular or total moment. Or, sometimes, it is the other way around. This happens for Mn3+ ions, which should have a J = 0 ground state according to the third Hund’s rule. However in perovskites such as LaMn ...
... of the crystal field, a magnetic ion in a crystal might lose, totally or partially, its spin, angular or total moment. Or, sometimes, it is the other way around. This happens for Mn3+ ions, which should have a J = 0 ground state according to the third Hund’s rule. However in perovskites such as LaMn ...
Lecture Notes 01: Introduction/Overview, Coulomb's Law, Electric Field, Principle of Superposition
... Answer: Free space is NOT empty!!! It is “filled” with virtual particle-anti-particle pairs!! (e.g. e+-e−, μ+-μ−, q − q , W+W−, etc. pairs) existing for short time(s), as allowed by the Heisenberg Uncertainty Principle – can “violate” energy (momentum) conservation only for time interval Δt ≤ / ΔE ( ...
... Answer: Free space is NOT empty!!! It is “filled” with virtual particle-anti-particle pairs!! (e.g. e+-e−, μ+-μ−, q − q , W+W−, etc. pairs) existing for short time(s), as allowed by the Heisenberg Uncertainty Principle – can “violate” energy (momentum) conservation only for time interval Δt ≤ / ΔE ( ...
Full text in PDF form
... The quantization of matter fields in curved space-times is, as widely believed, a preliminary step towards a more complete theory of quantum gravity [1]. In this framework the most important result is the thermal evaporation of black holes, whose temperature T is related to surface gravity κ by the ...
... The quantization of matter fields in curved space-times is, as widely believed, a preliminary step towards a more complete theory of quantum gravity [1]. In this framework the most important result is the thermal evaporation of black holes, whose temperature T is related to surface gravity κ by the ...
ARS03.rivest-slides
... Some algebraic structure seemed essential for a PKC; we kept returning to number theory and modular arithmetic… Difficulty of factoring not well studied then, but seemed hard… ...
... Some algebraic structure seemed essential for a PKC; we kept returning to number theory and modular arithmetic… Difficulty of factoring not well studied then, but seemed hard… ...
Propensities in Quantum Mechanics - Philsci
... mechanics and I contend that all their virtues are appropriately subsumed under the latter selective propensities view. I then point out some reasons for thinking that similar dispositional notions might also be appropriate for other mainstream interpretations or versions of quantum mechanics – even ...
... mechanics and I contend that all their virtues are appropriately subsumed under the latter selective propensities view. I then point out some reasons for thinking that similar dispositional notions might also be appropriate for other mainstream interpretations or versions of quantum mechanics – even ...
Renormalization
In quantum field theory, the statistical mechanics of fields, and the theory of self-similar geometric structures, renormalization is any of a collection of techniques used to treat infinities arising in calculated quantities.Renormalization specifies relationships between parameters in the theory when the parameters describing large distance scales differ from the parameters describing small distances. Physically, the pileup of contributions from an infinity of scales involved in a problem may then result in infinities. When describing space and time as a continuum, certain statistical and quantum mechanical constructions are ill defined. To define them, this continuum limit, the removal of the ""construction scaffolding"" of lattices at various scales, has to be taken carefully, as detailed below.Renormalization was first developed in quantum electrodynamics (QED) to make sense of infinite integrals in perturbation theory. Initially viewed as a suspect provisional procedure even by some of its originators, renormalization eventually was embraced as an important and self-consistent actual mechanism of scale physics in several fields of physics and mathematics. Today, the point of view has shifted: on the basis of the breakthrough renormalization group insights of Kenneth Wilson, the focus is on variation of physical quantities across contiguous scales, while distant scales are related to each other through ""effective"" descriptions. All scales are linked in a broadly systematic way, and the actual physics pertinent to each is extracted with the suitable specific computational techniques appropriate for each.