Bulletin of the American Physical Society
2011 Annual Meeting of the Four Corners Section of the APS
Volume 56, Number 11
Friday–Saturday, October 21–22, 2011; Tuscon, Arizona
Session M1: AMO III: New Techniques and Measurements |
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Chair: Jason Jones, University of Arizona Room: UA Student Union South Ballroom |
Saturday, October 22, 2011 11:10AM - 11:22AM |
M1.00001: Optimized design of a polarization spectroscopy experiment to measure collective spin projection noise Enrique Montano, Pascal Mickelson, Ivan Deutsch, Poul Jessen We optimize the design of an experiment to measure the projection noise of the collective spin of an atomic ensemble. In our setup, a weak probe beam interacts with a trapped sample of cesium atoms, leading to Faraday rotation of the probe light proportional to the collective atomic magnetization. If the ensemble-light coupling is strong enough, polarimetry of the probe light provides a measurement of the magnetization with resolution better than the spin projection noise, at which point measurement back-action becomes significant and can be used for quantum control of the collective spin. Here, we discuss two aspects of the experiment: first, the ``mode matching'' between the incident probe beam and the light scattered by the atoms, and second, the trapping laser parameters required to produce suitable atom clouds. Our modeling indicates that the probe beam waist size and the aspect ratio of the atomic cloud are the most important parameters for good mode matching. [Preview Abstract] |
Saturday, October 22, 2011 11:22AM - 11:34AM |
M1.00002: Aberration in Ion Optics to Focus Magneto-Optically Trapped Single Ions for a Silicon Quantum Computer Jinming Zhang, William Fairbank, Siu Au Lee The scalable Si-based quantum computer proposed by B. Kane requires precise placement of P-31 atoms 20nm apart and 10nm below the surface in a pure Si-28 substrate. To accomplish that, a scheme based on laser-cooled single Si-31 atom in a Magneto-Optical Trap (MOT) has been proposed. As part of this scheme, a single trapped Si-31 atom must be resonantly ionized and focused on the substrate with relatively low energy (100eV). Spherical aberration is the main limitation associated with focusing the single ions to $\sim $1 nm precision. The coefficient of spherical aberration has been determined for a promising design by varying the initial conditions of the ion beam. [Preview Abstract] |
Saturday, October 22, 2011 11:34AM - 11:46AM |
M1.00003: Collisional $^{3}$He and $^{129}$Xe Frequency Shifts in Rb--Noble-Gas Mixtures Zayd Ma, Eric Sorte, Brian Saam The Fermi-contact interaction that characterizes collisional spin exchange of a noble gas with an alkali-metal vapor also gives rise to NMR and EPR frequency shifts of the noble-gas nucleus and the alkali-metal atom, respectively. We have measured the enhancement factor $\kappa _{0}$ that characterizes these shifts for Rb- $^{129}$Xe to be 493$\pm $31, making use of the previously measured value of $\kappa _{0}$ for Rb-$^{3}$He. This result allows accurate $^{129}$Xe polarimetry with no need to reference a thermal- equilibrium NMR signal. [Preview Abstract] |
Saturday, October 22, 2011 11:46AM - 11:58AM |
M1.00004: Matter Wave Deflection through a Light Prism Joseph Ronan, Alexander Cronin, William Holmgren, Ivan Hromada, Raisa Trubko In optics, it is a well-known fact that a glass prism will bend a light beam incident on its surface. We present an atom optics experiment analogous to this phenomenon, but instead we use a light prism to deflect a beam of potassium atoms. We use a Mach-Zehnder atom interferometer to precisely measure atom beam deflections of as small as 5 nm. Through studying the beam deflection, we are able to investigate the dynamic polarizability and the magic zero wavelength of potassium. [Preview Abstract] |
Saturday, October 22, 2011 11:58AM - 12:10PM |
M1.00005: H$_2$O Megamasers: Measuring the Mass of the Black Hole in the AGN of Mrk1210 Stephen Clouse, James Braatz, Cheng-Yu Kuo We present a map of the water maser emission from the nucleus of the Seyfert 2 galaxy Mrk 1210, as observed with the Very Long Baseline Array. The map shows that the masers span $\sim$ 6 mas (0.8 pc). We detect redshifted and blueshifted components offset by $\sim$ 250 km/s but detect no masers directly at the systemic recession velocity of the galaxy. The spectral profile of the maser in Mrk 1210 is somewhat unlike the characteristic triple-peaked profiles of classic water megamasers in Active Galactic Nuclei accretion disks. However, our map shows that the masers are aligned roughly perpendicular to extended radio continuum structures in the nucleus, suggesting the masers come from the accretion disk. We find that we can fit the maser distribution with a flat, inclined disk, with two of the maser loci falling near the midline of the disk and a third coming from an azimuthal angle of 47 degrees on the near side of the disk. We analyzed archival GBT spectra of this galaxy to measure line-of-sight accelerations of the maser lines, and we find them all to have accelerations less than .25 km/s/yr, which is consistent with the flat disk model. With this scenario, we can estimate the mass of the central black hole to be approximately 1.3 $\times$ 10$^7$ M. [Preview Abstract] |
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