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On High-Efficiency Optical Communication and Key Distribution
On High-Efficiency Optical Communication and Key Distribution

... the channel output to a finite alphabet; however, even if quantum-optimal measurements are used rather than photon detection, the capacity is still finite. In Section II we give a short account of the “clean” channel capacity in the low-energy limit, and present pulse-position modulation (PPM) as a ...
Parallel Electric Field of a Mirror Kinetic Alfvén Wave
Parallel Electric Field of a Mirror Kinetic Alfvén Wave

... tric field of this wave exists only with a time varying field aligned current. Therefore, this wave is applicable to small scale, transient phenomena only. There are two types of so called “kinetic Alfvén wave” depending on the electron thermal speed. When the electron thermal speed is much higher ...
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Contact and Space-Charge Effects in Quantum Well Infrared

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... chips rapidly decreases. Once the size of individual elements reach a certain critical level, their behavior and properties are no longer governed by classical physics, but rather by quantum mechanics. Another motivation was put forward by Richard P. Feynman [Feynman, 1982], who was among the first ...
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Three Roads To Quantum Gravity
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Physics Formulary

... It can also be obtained on the WWW. See http://www.xs4all.nl/˜johanw/index.html, where also a Postscript version is available. If you find any errors or have any comments, please let me know. I am always open for suggestions and possible corrections to the physics formulary. This document is Copyrig ...
Physics Formulary - Home Page of ir. JCA Wevers
Physics Formulary - Home Page of ir. JCA Wevers

Above-threshold ionization in a strong dc electric field
Above-threshold ionization in a strong dc electric field

... launched radially outward at r ⬃ 100– 200 a.u. with energy E + n␻. However, we now used the Kramers-Henneberger frame—i.e., the acceleration gauge. Figure 5 shows the positions of observed peaks in the radial distributions of the emitted photoelectrons as a function of the energy of the Rydberg stat ...
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... one hand there is unitary evolution, which is deterministic. If we specify the initial state |ψ(0)i, the theory predicts the state |ψ(t)i at a later time. But on the other hand there is measurement, which is probabilistic. The theory does not make definite predictions about the measurement outcomes; ...
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BPS Geometry, AdS/CFT, and String Theory
BPS Geometry, AdS/CFT, and String Theory

... in CERN will presumably address some problems in the Tev Scale physics, for example the electroweak symmetry breaking, superparticles, and large extra dimensions, which are relevant to string theory. String theory has a very constrained mathematical structure, so the theory is very unique. The theor ...
Statistical Methods and Thermodynamics Chem 530b: Lecture
Statistical Methods and Thermodynamics Chem 530b: Lecture

... 10 electrons, atoms or molecules), so many degrees of freedom that in practice it is impossible to prepare such systems in a well defined microscopic quantum state (i.e., in a pure quantum state). Instead, they are usually prepared in thermodynamic states (i.e., in a statistical mixtures of quantum ...
Lecture 5, Conservation Laws, Isospin and Parity
Lecture 5, Conservation Laws, Isospin and Parity

... A more general form of a weak Hamiltonian that does not conserve parity is of the form: HW= (S,S) + (S,PS) + (V,V) + (V,AV) + () ....... It is an experimental fact that the weak interactions where a charged lepton turns into a neutrino (“charged current”) can be described by a Hamiltonian of the for ...
Path integral for the quantum harmonic oscillator using elementary
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atom interferometer - Center for Ultracold Atoms
atom interferometer - Center for Ultracold Atoms

... We recently measured the velocity dependence of the index of refraction seen by sodium matter-waves passing through a gas target. In optical parlance, we measured the dispersion, i.e. the variation of index with wavelength. Our experiment's unique sensitivity to the phase shift of forward-scattered ...
THE K-THEORY OF FREE QUANTUM GROUPS 1. Introduction A
THE K-THEORY OF FREE QUANTUM GROUPS 1. Introduction A

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Theoretical Physics T2 Quantum Mechanics

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Atomic Physics

... Atomic physics may loosely be defined as the scientific study of the structure of the atom, its energy states, and its interactions with other particles and fields. Learning Atomic Physics is important not only for understanding the physics of the atom but also the technological applications thereof ...
Quantum Optical Multiple Scattering
Quantum Optical Multiple Scattering

... This thesis concerns the theoretical investigation of interference phenomena related to elastic and inelastic scattering of quantized light. The presented work is naturally divided into two parts, the first is concerning elastic scattering while the second explores inelastic scattering. In the first ...
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Non-abelian quantum Hall states and fractional charges in

... In this thesis we investigate certain non-abelian quantum Hall states by mapping the two-dimensional system onto a thin torus, where the problem becomes effectively one-dimensional and hopping is suppressed, meaning that the classical electrostatic interaction dominates. The approach assists with a ...
research statement - University of Illinois at Chicago
research statement - University of Illinois at Chicago

... The most difficult part of this approach is step (3). To handle step (3) Erdös-Schlein-Yau [13] discovered the powerful combinatorial argument that resolves the issue of the factorial growth of number of terms coming from iterated Duhamel expansions. Later in [31], Klainerman and Machedon gave a sh ...
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History of quantum field theory

In particle physics, the history of quantum field theory starts with its creation by Paul Dirac, when he attempted to quantize the electromagnetic field in the late 1920s. Major advances in the theory were made in the 1950s, and led to the introduction of quantum electrodynamics (QED). QED was so successful and ""natural"" that efforts were made to use the same basic concepts for the other forces of nature. These efforts were successful in the application of gauge theory to the strong nuclear force and weak nuclear force, producing the modern standard model of particle physics. Efforts to describe gravity using the same techniques have, to date, failed. The study of quantum field theory is alive and flourishing, as are applications of this method to many physical problems. It remains one of the most vital areas of theoretical physics today, providing a common language to many branches of physics.
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