Bulletin of the American Physical Society
2007 New England Section of the APS and AAPT Joint Fall Meeting
Volume 52, Number 17
Friday–Saturday, October 19–20, 2007; Storrs, Connecticut
Session E2: APS Contributed Talks: Theory |
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Chair: David Markowitz, University of Connecticut Room: MSB BSP-130 |
Saturday, October 20, 2007 8:00AM - 8:15AM |
E2.00001: Positronium Formation with a Positron Beam and a Carbon Target: A Theoretical Study of Spin Coupling. Sudha Swaminathan, David Schrader A single-collision scattering between a spin-polarized positron beam and a carbon target is considered. The spin coupling between the positron and the triplet ground state of carbon leading to the production of positronium and a carbon ion is studied. Angular momentum coupling and density matrix techniques are then used to predict the probabilities of forming para and ortho positronium when the angle between the polarization vectors of the beam and the target is altered. [Preview Abstract] |
Saturday, October 20, 2007 8:15AM - 8:30AM |
E2.00002: Seeing spin-2 symmetry in a vector current coupling term Doug Sweetser The Gravity and Electromagnetic (GEM) action to unify gravity and EM will be reviewed, pointing out the errors made along the way. One subtle issue involves the current coupling term, J$^u$ A$_u$. One can do a Fourier transform of the potential into a momentum space, then consider a current-current interaction, J J$'$. The product of two currents, J* J$'$, has the phase for a spin 1 particle, the photon. I demonstrate that (iJi)* J$'$ has the phase of a spin 2 particle, the graviton. Both spin 1 and spin 2 particles are required for a unified field theory where like electric charges repel and like mass charges attract. [Preview Abstract] |
Saturday, October 20, 2007 8:30AM - 8:45AM |
E2.00003: Image Storage in Hot Vapors Lu Zhao, Tun Wang, Yanhong Xiao, Susanne F. Yelin We consider imaging through hot atomic vapors based on light storage technique. A $4f$ system is adopted for imaging. By placing an atomic vapor cell over the transform plane, the Fraunhofer diffraction pattern of an object in the object plane can be transformed into atomic Raman coherence. We investigate how the stored diffraction pattern evolves under diffusion of atoms. Our numerical simulation shows, for a long storage time, the dark spots of the stored pattern can still exist even under strong diffusion conditions. This results from the destructive interference produced by the spatial coherence of Raman coherence. Then, when the stored diffraction pattern is retrieved by applying a reading light, it can produce an image in the image plane. Our result indicates, under appropriate conditions, an image with high fidelity can be reconstructed. This scheme may open a new path for classic or quantum image and information processing. [Preview Abstract] |
Saturday, October 20, 2007 8:45AM - 9:00AM |
E2.00004: Single Photon Nonlinearity in Cold Polar Molecules: Potential Quantum Computing Application Timothy Bragdon, Susanne Yelin Assuming storage-retrieval framework of EIT, we investigate dipole-dipole interactions in ensembles of cold polar molecules, and discuss the application of single-photon optical nonlinearity in the context of quantum computation, e.g. controlled phase gate. [Preview Abstract] |
Saturday, October 20, 2007 9:00AM - 9:15AM |
E2.00005: Nonlinear Photon Interference in Polar Molecular Gases R. Rajapakse, T. Bragdon, A. Rey, S. Yelin We explore nonlinear photon interference in cold polar molecular gases. This nonlinearity gives us a resultant phase shift in a geometry of trapped polar molecules. The phase shift thus obtained is an interesting tool in the design of a phase gate in the field of quantum computation. We model and characterize dispersion curves of such gases. We also calculate decoherence rates and how they affect the photon nonlinearities in 1D and 2D dipolar gases. [Preview Abstract] |
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