Category: Quantum Theory

Quantum Mechanics: A Modern Introduction

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But the trajectory of an electron in a cloud chamber looks very much like that of a moving particle, despite Heisenberg's claim that it is senseless to speak of "the path of an electron". Like classical physics, quantum theory sometimes describes light as a wave, because light behaves like a wave in many situations. The thought experiment of the light burst and light-collector showed why: If one and the same entity is to behave as both a wave and a particle, then an understanding in terms of probabilities is absolutely required. (For, again, 0.05 of a particle makes no sense, whereas a 0.05 chance of a particle does.) The Uncertainty Principle, the bedrock of quantum theory, implies that even if one had all the information there is to be had about a physical system, its future behavior cannot be predicted exactly, only probabilistically.
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Hydrostatics and Elementary Hydrokinetics

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Collisions with air molecules prevent the perfume from dissipating quickly. Superposition allows us to have a wave that is moving both to the left and right at the same time, and thus goes nowhere. The energy of a hydrogen atom (which has only one electron) corresponds to the distance of the electron from the nucleus. (The further the electron is, the higher its energy is.) Rutherford's model predicts that the radiation emitted by a hydrogen atom could have any of a continuous set of possible energies, depending on the distance of its electron from the nucleus.
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Differential Topology and Quantum Field Theory

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As he says; .. some things that satisfy the rules of algebra can be interesting to mathematicians even though they don't always represent a real situation. (Feynman) This explains why he had such success and such failure at the same time, as he had the correct spherical wave structure of Matter, but he continued with two further errors, the existence of the particle, and the use of vector 'electromagnetic' waves (mathematical waves of force), rather than using the correct scalar 'quantum' waves.
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Theoretical Methods in the Physical Sciences: an

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Phys. 66, 129 (1994); cond-mat/9307009. But now a set of surprising experiments with fluids has revived old skepticism about that worldview. BRIAN GREENE: You see, in the 1920s a group of young scientists stole the spotlight from Einstein when they came up with an outlandish new way of thinking about physics. All of Clarke’s claims rest on the idea that Copenhagen is a priori correct. This result is called Pauli's exclusion principle. The whole point of the two-slit problem is to demonstrate that the observer cannot observe what is going on with the photons without destroying their behavior.
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Comprehensive Semiconductor Science and Technology,

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The phenomenon underlies quantum computing, quantum cryptography and quantum teleportation. Quantum came into the latter usage in 1900, when the physicist Max Planck used it in a presentation to the German Physical Society. Such a wave ''fragment'' is somewhat different than an ordinary plane wave and it is difficult to know how to interpret this. As gravity is explained in the article on Relativity, the general idea is only briefly summarised here.
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Theory of Quantum Computation, Communication, and

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Yet it became obvious that this wasn’t true. Thus he was not actually looking for the wave structure of matter. So why have Romania decided to commit the money and resources needed to become a full member? But we're too dumb to figure it out ourselves! In order to further examine the performance of these witness operators, we present a simple way to generate states that closely approximate Werner states, which have a controllable degree of entanglement.
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How the Hippies Saved Physics: Science, Counterculture, and

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The major problem facing these approaches is to define measurement and experimental context in a sufficiently rigorous way. Labels for individual particles like in the Schrödinger many-particle formalism do not occur any more, which is the crucial deviation from the classical notion of particles. I talk about the evidence for quantized matter (i.e. atoms), such as Dalton’s law of multiple proportions, Faraday’s demonstration in 1833 that charge is quantized, Thomson’s experiment, Millikan’s experiment, and so on.
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Coherent Dynamics of Complex Quantum Systems (Theoretical

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String theory is a quantum theory where the fundamental objects are one dimensional strings and not point like particles. Mathematically, we represent a mixed state by an object called a density matrix. It was late spring in Göttingen, and Heisenberg suffered from an allergy attack so severe that he could hardly work. Thus we clarify that decoherence is not a new theory unto itself, but is instead an efficient and fruitful repackaging of theory.
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The Oskar Klein Memorial Lectures Volume 3

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If we don't assume that, we can't avoid the conclusion that a system can observe itself, in some obscure sense. Our understanding of the world we live in determines the ethics we live by; living a life based on a worldview that is an illusion can easily lead to living the wrong life. We still lack a reliable data base and repeatable psi effects upon which a theory might be constructed and refined. Physicists have used it to correctly predict the behavior and characteristics of molecules, atoms, nuclei of atoms, and elementary particles.
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Advances in Quantum Chemistry, Volume 53: Current Trends in

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However, the matter is all attracting itself by gravity. He was awarded the Nobel Prize for Physics in 1918. While ancient Greek science did rely upon some empirical evidence, it was heavily dominated by deductive reasoning. What they are really asking is 'what are the forces acting upon the particle that we have not detected? The new method utilizes aspects of all three techniques to analyze the plasma waves in pulsars.
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