Bulletin of the American Physical Society
Joint Fall 2011 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 56, Number 7
Thursday–Saturday, October 6–8, 2011; Commerce, Texas
Session D8: Foundations of Quantum Systems I |
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Chair: Harry Swinney, University of Texas at Austin Room: Sam Rayburn Center Second Floor, Pride Room |
Friday, October 7, 2011 1:40PM - 1:52PM |
D8.00001: Generation of coherent microwave radiation in a three level lambda system Sankar Davuluri, Yuri Rostotsev Generation and control of coherent microwave radiation has gained lot of importance because of its potential applications in many fields like spectroscopy, metrology, atomic physics and Interferometry. In this presentation, we report the possibility of generation of coherent micro wave radiation in a three level lambda system. The upper two levels of the system are driven at resonance by a strong drive field while the highest and lowest levels are coupled by a weak probe field with some detuning. The coherent micro wave is generated between the lower two levels where the electric dipole moment is forbidden. The efficiency of the generated micro wave radiation is found to be very strongly dependent on the wave vector mismatch between the drive and probe fields. [Preview Abstract] |
Friday, October 7, 2011 1:52PM - 2:04PM |
D8.00002: Quantum storage based on spacial angular control Xiwen Zhang, Alexey Kalachev, Olga Kocharovskaya We consider the realization of Quantum Memory through off resonant Raman interaction in a three level solid state medium, via angular manipulation of the control field. We find it is in principle possible to obtain retrieval signal with almost one hundred percent efficiency and fidelity in free space. [Preview Abstract] |
Friday, October 7, 2011 2:04PM - 2:16PM |
D8.00003: Kinetics And Optical Properties Of The Strongly Driven Gas Medium Of Interacting Atoms Andrii Sizhuk, Philip Hemmer This paper investigates stimulated emission and absorption near resonance for a driven system of interacting two-level atoms. Microscopic kinetic equations for the density matrix elements of N-atom states including atomic motion are built, taking into account atom-field and atom-atom interactions. Analytical solutions are given for the resulting macroscopic equations in different limits, for the system composed of a strong coherent ``pump'' field and a weak counter-propagating ``probe'' field. It was shown that the existence of a dipole-dipole (long-range) interaction between atoms separated by distance less than the pump wave-length can cause the formation of periodic polarization and population structures (gratings in time and space) in the pumped medium without a probe field. The ``interaction'' between pump and probe induced polarization/population gratings through a dipole-dipole interaction mechanism causes the absorption line shape asymmetry. This asymmetry is revealed in increasing probe gain for the ``red''-shifted (relative to pump) probe and suppressing the gain for the ``blue''-shifted probe field when pump is ``red''- shifted relative to the ensemble averaged resonant frequency. The theoretical results are consistent with experimental data for the probe gain as the function of frequency and atomic density for sodium vapor with the pump laser tuned near $D_{2}$ line. Here the dependance of gain on particle density was explained in the terms of the long-range interaction between the atoms. [Preview Abstract] |
Friday, October 7, 2011 2:16PM - 2:28PM |
D8.00004: Some preliminary thoughts on the invention of constrained Hamiltonian dynamics Donald Salisbury I will present some tentative remarks on the origins of constrained Hamiltonian dynamics, based in part on interviews recently conducted by myself and Dean Rickles with several key contributers. These interviews with James Anderson, Stanley Deser, Charles Misner, and Josh Goldberg were partially supported by the Center for the History of Physics of the American Institute of Physics, and will eventually be made available on the Center web page. [Preview Abstract] |
Friday, October 7, 2011 2:28PM - 2:40PM |
D8.00005: Motivation for the Optical Characterization of Light Pollution in West Texas Shivakumar Surendranath, Hillary Proffit, Hardin Dunham We have developed a process for photographing the night sky and analyzing the CCD count data to generate a visual representation of the distribution of light pollution in the night sky. Repeating this process at strategic locations will allow for the accumulation of meaningful data over several years in which the background light pollution is expected to change. The Clean Energy Act of 2007 mandates the change from incandescent to fluorescent lighting at the end of 2011 for residences. The spectrum shift from this change is expected to increase the amount of scattered light in the night sky. We present evidence for the motivation behind mapping the light pollution distribution in West Texas in order to inform the public about conserving dark sky natural resources. [Preview Abstract] |
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