979 resultados para Light-front field theories


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Front Row: Jennifer Zangara, April Fronzoni, Katy Moyneur, Jessica Rose, Molly Malone, Kristi Gannon

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Back Row: Doc May, Theodore Boville, Oscar Olson, Albert Lent, John Barnes, Abe Cohn, coach Fielding Yost, Frank Steketee, Robert Dunne, C. Wilford Wilson, D. Hadden, Nicholas Scheidler, Edward Hauser, asst. coach Prentis Douglas

Third Row: Frederick Fletcher, Frank Czysz, Harold Hunt, Jean Paul Freeman, Ernie Vick, Murray Van Wagoner, William Henderson, Angus Goetz, Chester Morrison, L.O. Lindstrom

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Back Row: head coach Nancy Cox, Kristen Tiner?, Kara Lentz, Heather Wiley, Beth Riley, Catherine Pickard, Jillianne Whitfield, Jeannie Goldfarb, Lori Hillman, assistant coach Patrick Cota

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Back Row: Cedric Sweet, Franklin Lett, Steve Remias, Carl Carr, Russ Oliver, captain Thomas Austin, Robert Johnson, Willard Hildebrandt, Edward Stone, Michael Savage, Thomas Oyler, Harry Wright, Joe Fisher, Jack Liffiton, John Viergever, Herman Everhardus, Willis Ward, Matt Patanelli, Robert Graper

Middle Row: John Mumford, James Kidston, William Borgmann, Chester Beard, Howard Triplehorn, Vincent Pope, Ernest Pederson, Joseph Ellis, Robert Amrine, Russell Fuog, Stanton Schuman, Vincent Aug, Winfred Nelson, John Regeczi

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Back Row: Cedric Sweet, Franklin Lett, Steve Remias, Carl Carr, Russ Oliver, captain Thomas Austin, Robert Johnson, Willard Hildebrandt, Edward Stone, Michael Savage, Thomas Oyler, Harry Wright, Joe Fisher, Jack Liffiton, John Viergever, Herman Everhardus, Willis Ward, Matt Patanelli, Robert Graper

Middle Row: John Mumford, James Kidston, William Borgmann, Chester Beard, Howard Triplehorn, Vincent Pope, Ernest Pederson, Joseph Ellis, Robert Amrine, Russell Fuog, Stanton Schuman, Vincent Aug, Winfred Nelson, John Regeczi

Front Row: John Connolly, Jesse Garber, David Barnett, John Rieck, Frank Bissell, Eli Soodik, William Renner, Richard James, Ferris Jennings, Harry Pillinger, Harry Lutomski, George Bolas, Charles Brandman, Gerald Ford

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Back Row: assistant coach A.J. Sturznegger, Richard Rowland, Frank Czysz, Abe Cohn, George Planck, James Johns, Louis Lehman, William Van Orden, assistant coach Robert Watson,

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Thesis (Ph.D.)--University of Washington, 2016-06

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We investigate the emission of multimodal polarized light from light emitting devices due to spin-aligned carrier injection. The results are derived through operator Langevin equations, which include thermal and carrier-injection fluctuations, as well as nonradiative recombination and electronic g-factor temperature dependence. We study the dynamics of the optoelectronic processes and show how the temperature-dependent g factor and magnetic field affect the degree of polarization of the emitted light. In addition, at high temperatures, thermal fluctuation reduces the efficiency of the optoelectronic detection method for measuring the degree of spin polarization of carrier injection into nonmagnetic semicondutors.

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We analyse the relation between local two-atom and total multi-atom entanglements in the Dicke system composed of a large number of atoms. We use concurrence as a measure of entanglement between two atoms in the multi-atom system, and the spin squeezing parameter as a measure of entanglement in the whole n-atom system. In addition, the influence of the squeezing phase and bandwidth on entanglement in the steady-state Dicke system is discussed. It is shown that the introduction of a squeezed field leads to a significant enhancement of entanglement between two atoms, and the entanglement increases with increasing degree of squeezing and bandwidth of the incident squeezed field. In the presence of a coherent field the entanglement exhibits a strong dependence on the relative phase between the squeezed and coherent fields, that can jump quite rapidly from unentangled to strongly entangled values when the phase changes from zero to pi. We find that the jump of the degree of entanglement is due to a flip of the spin squeezing from one quadrature component of the atomic spin to the other component when the phase changes from zero to pi. We also analyse the dependence of the entanglement on the number of atoms and find that, despite the reduction in the degree of entanglement between two atoms, a large entanglement is present in the whole n-atom system and the degree of entanglement increases as the number of atoms increases.

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Quantum optics experiments on bright beams are based on the spectral analysis of field fluctuations and typically probe correlations between radio-frequency sideband modes. However, the extra degree of freedom represented by this dual-mode picture is generally ignored. We demonstrate the experimental operation of a device which can be used to separate the quantum sidebands of an optical field. We use this device to explicitly demonstrate the quantum entanglement between the sidebands of a squeezed beam.

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We investigate the nonclassicality of a photon-subtracted Gaussian field, which was produced in a recent experiment, using negativity of the Wigner function and the nonexistence of well-behaved positive P function. We obtain the condition to see negativity of the Wigner function for the case including the mixed Gaussian incoming field, the threshold photodetection and the inefficient homodyne measurement. We show how similar the photon-subtracted state is to a superposition of coherent states.

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We investigate the use of nanocrystal quantum dots as a quantum bus element for preparing various quantum resources for use in photonic quantum technologies. Using the Stark-tuning property of nanocrystal quantum dots as well as the biexciton transition, we demonstrate a photonic controlled-NOT (CNOT) interaction between two logical photonic qubits comprising two cavity field modes each. We find the CNOT interaction to be a robust generator of photonic Bell states, even with relatively large biexciton losses. These results are discussed in light of the current state of the art of both microcavity fabrication and recent advances in nanocrystal quantum dot technology. Overall, we find that such a scheme should be feasible in the near future with appropriate refinements to both nanocrystal fabrication technology and microcavity design. Such a gate could serve as an active element in photonic-based quantum technologies.

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We present a method for characterizing microscopic optical force fields. Two dimensional vector force maps are generated by measuring the optical force applied to a probe particle for a grid of particle positions. The method is used to map Out the force field created by the beam from a lensed fiber inside a liquid filled microdevice. We find transverse gradient forces and axial scattering forces on the order of 2 pN per 10 mW laser power which are constant over a considerable axial range (> 35 mu m). These findings suggest Future useful applications of lensed fibers for particle guiding/sorting. The propulsion of a small particle at a constant velocity of 200 mu m s(-1) is shown.