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MERLOT MaterialsCopyright (C) 2018 MERLOT Some Rights ReservedTue, 10 Feb 2015 21:43:02 GMTMERLOThttps://www.merlot.org/merlot/images/merlot_column.png
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-1-1Quantum Mechanics Resource Packet
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This applet displays the pictures and programming code for a square well, notchshaped, and parabolic potentials. Also, it displays a particle sloshing in a well with a bump in the middle, suggestions for a onedimensional lattice and a spherically symmetric 3D potential well, and information on Heisenbergs Uncertainty Relation. The Maple programming code is available in text and downloadable form for most of these scenarios.Mon, 01 Dec 2008 21:30:05 GMTMike MoloneyRichard Feynman: The Douglas Robb Memorial Lectures
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A set of four archival recordings from the University of Auckland (New Zealand) of the physicist Richard Feynman. The lectures focus on the quantum nature of light and Quantum Electrodynamics.Mon, 17 Nov 2003 08:00:00 GMTRichard Feynman Published by the University of AucklandLecture 1: Introduction to the Spectroscopic Effective Hamiltonian
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This video was recorded at Introductory Quantum Mechanics II - Spring 2004. The Born-Oppenheimer approximation and matrix elements of terms in the effective molecular Hamiltonian that violate the BO approximation. Vibration, rotation, spin-orbit, interelectronic interaction. Hund's coupling cases.Tue, 10 Feb 2015 21:03:59 GMTRobert W. Field Center for Future Civic MediaLecture 2: Spectroscopic Pertubations, Predissociation, and Autoionization
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This video was recorded at Introductory Quantum Mechanics II - Spring 2004. Introduction to dynamical processes.Tue, 10 Feb 2015 21:04:00 GMTRobert W. Field Center for Future Civic MediaLecture 34: The Wonderful Quantum World - Breakdown of Classical Mechanics
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This video was recorded at MIT 8.01 Physics I: Classical Mechanics - Fall 1999. 1. Discrete Energy Levels: Electrons orbit their atomic nucleus in well defined orbits corresponding to discrete energy levels. The electrons can jump from one energy level to a vacant energy level, but they cannot exist in between. Transitions between these energy levels gives rise to absorption and emission of light in discrete spectral lines (wavelengths). The students are encouraged to look through their diffraction gratings at helium and neon light sources to see evidence of these discrete wavelengths of emitted light. 2. Particles and Waves: Quantum mechanics introduces some very non-intuitive concepts, e.g. light behaves as both a particle (a photon) and a wave, and a particle behaves like a wave with a wavelength inversely proportional to its momentum. Interference is a wave phenomenon, and indeed particles can interfere with each other. Both the position and momentum of a particle cannot be accurately specified at the same time (Heisenberg's uncertainty principle). 3. Diffraction by a Slit: Diffraction of light by a narrow vertical slit is a well understood classical wave phenomenon consistent with Heisenberg's uncertainty principle. The narrower the slit, the smaller is the uncertainty in the horizontal position of the photons which have to sneak through the narrow opening, so the greater is the horizontal spread of the transmitted protons (uncertainty in their momentum). Quantum mechanics only allows you to predict positions of particles with certain probabilities. In the classical, Newtonian, world you can predict the position and movement of a particle to any degree of accuracy - NOT in the microscopic quantum world. The Newtonian picture is perfect for describing the behaviour of basketballs and planets in the macroscopic world.Tue, 10 Feb 2015 21:07:44 GMTWalter H. G. Lewin Center for Future Civic MediaLecture 3: Semiclassical Methods for Calculating Vibrational Overlap Integrals
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This video was recorded at Introductory Quantum Mechanics II - Spring 2004. All coupling processes are mediated by vibrational overlap integrals, which are computed numerically. Semiclassical calculation of overlaps reveals physical factors controlling computed values: the length of the stationary phase region is controlled by the slopes of the potential curves at the intersection and the velocity in the crossing region.Tue, 10 Feb 2015 21:04:01 GMTRobert W. Field Center for Future Civic MediaLecture 4: Wavepackets and Landau-Zener
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This video was recorded at Introductory Quantum Mechanics II - Spring 2004. What happens in the vicinity of a curve crossing?Tue, 10 Feb 2015 21:04:02 GMTRobert W. Field Center for Future Civic MediaNetworks through a Quantum Lens
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This video was recorded at Workshop on Function Prediction in Complex Networks, Kavli Royal Society Centre, Chicheley Hall 2012. The workshop was funded by the Royal Society under the the Research Fellows International Scientific Seminars scheme, and the PASCAL2 network provided funding to cover the filming. The aim of the meeting was to bring together researchers from complex networks, and those working in machine learning and graph theory. The goal was to identify current challenges in complex networks analysis and identify possible methodologies for addressing them. The meeting was composed of four sessions: methods for measuring and characterising complex network structure. dynamic processes on complex networks. complex network function prediction. future directions, collaboration and networking. The presentations were not intended to be lectures focused on specific research results. Instead they were expected to summarize state-of-the-art or accepted wisdom, challenge it and pose a provocative agenda for the discussions. We thank Sir Peter Knight and the staff at the Royal Society Kavli Centre for providing a conducive and enjoyable environment for the meeting.Mon, 09 Feb 2015 04:59:20 GMTSimone Severini Department of Computer Science, University College LondonQuantum information and stabilization of quantum states by feedback control
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This video was recorded at Workshop on Statistical Physics of Inference and Control Theory, Granada 2012. We give a basic account of quantum filtering and control from the point of view of quantum probability and information theory. We describe and prove the "no-cloning" principle, and Heisenberg's related principle which says that the leakage of information to the environment necesserily implies. a deterioration of the quantum state. A typical challenge to quantum technology issuing from this principle is to recover the leaked information and to feed it back into the system under control in order to preserve its state. We show that in the situation of discrete time and complete recovery such feedback control indeed enables us to stabilize any particular quantum state, pure or mixed. We illustrate this fact by an example where it is actually well-known: the fluorescent two-level atom (in a discrete time setting).Mon, 09 Feb 2015 05:03:04 GMTHans Maassen Faculty of Science, Radboud University NijmegenQuantum information and the Brain
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This video was recorded at 26th Annual Conference on Neural Information Processing Systems (NIPS), Lake Tahoe 2012. Ever since quantum mechanics was discovered nearly a century ago, famous scientists from Eddington to Wigner to Compton to Eccles to Penrose have speculated about possible connections to the brain – a quest often parodied as "quantum mechanics is mysterious, the brain is mysterious, ergo they must be related somehow." In this talk, I'll offer a critical survey of these ideas from the modern standpoint of quantum information theory, pointing out the huge conceptual and experimental problems that have plagued most concrete proposals. However, I'll also explain why I think some role for quantum mechanics in cognition is not yet excluded, and discuss what sorts of advances in neuroscience and physics might help settle the question.Tue, 10 Feb 2015 21:43:02 GMTScott Aaronson Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, MITQuantum Mechanics for the Uninitiated (i.e., for those who are still sane...)
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<p>A presentation on the nature of science and how it relates to quantum mechanics. Level is for high school to beginning college. Takes the viewer through the quirks and seeming paradoxes of quantum mechanics, including the double slit experiment and Schrodinger's Cat.</p>Fri, 30 Jul 2010 11:01:03 GMTCecilia Barnbaum Valdosta State UniversityQuantum Physics with Ultrabroadband and Intense Terahertz Pulses
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This video was recorded at Kolokviji na Institutu "Jožef Stefan". Low-energy elementary excitations such as phonons, excitons, magnons or energy gaps insemiconductor nanostructures and strongly correlated materials are of central importance for solid-state physics. The frequency window between 1 THz and 100 THz comprises most of these resonances. Over the last years, phase-locked light pulses in the ultrabroadband terahertz spectral domain have evolved into a powerful tool for probing these excitations directly via the amplitude of the light field and on a sub-cycle time scale. Latest advances of intense multi-THz sources generating peak electric and magnetic fields as high as 108 MV/cm and 30 T, respectively, have now facilitated the important step from mere observation to coherent control of low-energy dynamics by intense THz transients. After an introduction to the technology, typical examples of ultrabroadband and nonlinear THz studies on complex materials, as well as first steps towards new areas of quantum optics are presented: Sub-cycle analysis of electronic and lattice degrees of freedom after electronic excitation of VO2 and YBa2Cu3O7-δ, coherent switching of spin waves in NiO via the magnetic field component and non-adiabatic THz quantum optics controlling light-matter interaction in the ultrastrong coupling regime.Tue, 10 Feb 2015 20:48:39 GMTAlfred Leitenstorfer Chair of Modern Optics and Quantum Electronics, University of KonstanzQuantum states of neutrons in the gravitational and centrifugal potentials in a new GRANIT spectrometer
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This video was recorded at CERN Colloquium. We will discuss the scientific program to be studied in a new gravitational spectrometer GRANIT in a broad context of quantum states (quantum behaviour) of ultracold neutrons (UCN) in gravitational [1] and centrifugal [2] potentials, as well as applications of these phenomena/spectrometer to various domains of physics, ranging from studies of fundamental short-range interactions and symmetries to neutron quantum optics and reflectometry using UCN. All these topics, as well as related instrumental and methodical developments have been discussed during dedicated GRANIT-2010 Workshop [3]. The GRANIT spectrometer has been recently installed at the Institut Laue-Langevin, Grenoble, France [4] and could become operational in near future.Mon, 09 Feb 2015 04:48:11 GMTValery Nesvizhevsky Institut Laue-LangevinThe Quantum Geometric Limit
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This video was recorded at Workshop on Statistical Physics of Inference and Control Theory, Granada 2012. This talk derives fundamental limits to the accuracy with which clocks and signals - e.g. the global positioning system (GPS) - can measure space and time. By combining quantum limits to the accuracy of measurement with the requirement that the local energy density of clocks and signals be less than the black hole energy density, I derive the quantum geometric limit: the total number of ticks of clocks and clicks of detectors that can take place in a volume of spacetime of radius R over time T is no greater than R times T divided by the Planck length times the Planck time.Mon, 09 Feb 2015 05:03:03 GMTSeth Lloyd Engineering Systems Division, Massachusetts Institute of Technology, MITThe Second Law and Quantum Physics
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This video was recorded at MIT World Series: Meeting the Entropy Challenge. In this often droll lecture on a very abstract subject, Charles Bennett explores entropy, "one of my long loves," and how it relates to quantum information. He first reminds his audience that such information is reducible to qubits, a two-state system that can exist in a superposition of states -- such as the polarized photon. Bennett believes that "quantum mechanics helps resolves the paradox or puzzle of the origin of the second law" of thermodynamics—the irreversible increase of entropy. Classical science might invoke chaos dynamics or environmental effects to explain entropy. The quantum way of viewing it involves entanglement. In classical mechanics, when two subsystems in a definite state interact "by some deterministic reversible interaction," there will be a definite output for each subsystem. "The entropy of the whole thing will be 0+0=0." But while the entropy output of two quantum systems interacting might be 0, the individual subsystems manage to have "as much entropy as they could possibly have." This is due to entanglement, "a state of the whole system that cannot be described by attributing states to its parts. Two entangled photons can be said to be in a definite state of sameness even though neither has a polarization of its own." Bennett acknowledges "this is an idea that's hard to explain to many people," although he believes that back in 1967, during the Summer of Love, many people "could understand this from an intuitive sense, if not mathematically." Bennett plays with the famous evanescence of quantum information, noting that the photons illuminating him fill up the room with "optical replicas of the shape of my nose." But where do they go? He says, "If no record is made of which path a photon follows through an interferometer, or if a record is made but then unmade, the photons will have followed a superposition of both paths. Putting it in slightly theological terms, after the experiment is over, even God doesn't remember which path it followed." Most classical information, such as "a pattern of snowflakes or grains of rice in last night's dinner," is impermanent, though occasionally frozen by a fossil-like process, Bennett says. It's like a medallion he saw in a flea market: "In 1832, on this spot, nothing happened." But even if information in our physical world is doomed to vanish, in spite of our digital-age efforts to duplicate everything, "the particular physics of our universe" viewed from the perspective of quantum dynamics, seems to "evolve in a complexity-increasing manner, under appropriate conditions," concludes Bennett.Tue, 10 Feb 2015 21:10:21 GMTCharles H. Bennett IBM ResearchTrki atomskih delcev
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This video was recorded at Kolokviji na Institutu "Jožef Stefan". V predavanju bom predstavil pomen in značilnosti raziskav trkov atomskih delcev in podal nekaj značilnih primerov. Po krajšem zgodovinskem uvodu bom predstavil primere trkov elektronov z atomi in molekulami, ionov z atomi in molekulami kakor tudi trkov, ki se dogajajo na površinah. Izbrane primere bomo obravnavali tudi z vidika njihovega pomena pri razlagi pojavov v naravi ali v laboratorijskih plazmah. Podan bo tudi krajši pregled sedanjih potreb in perspektive tovrstnih raziskav z vidika razvoja fuzijske plazme v tokamak reaktorjih in za razlago opažanj pojavov v vesolju.Tue, 10 Feb 2015 20:47:45 GMTIztok Čadež Department of Low and Medium Energy Physics, Jožef Stefan Institute