Bulletin of the American Physical Society
43rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 57, Number 5
Monday–Friday, June 4–8, 2012; Orange County, California
Session U1: Hot Topics |
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Chair: David Schultz, University of North Texas Room: Grand Ballroom BCD |
Friday, June 8, 2012 10:30AM - 11:00AM |
U1.00001: A steady-state superradiant laser with less than one intracavity photon Invited Speaker: James K. Thompson We have demonstrated the quasi-continuous operation of a Raman laser that operates deep into the superradiant or bad-cavity regime.\footnote{J. G. Bohnet, Z. Chen, J. M. Weiner, D. Meiser, M. J. Holland, J. K. Thompson Nature {\bf 484}, 78-81 (05 April 2012)} In this laser, laser-cooled Rb atoms act as the flywheel for phase information, in place of the photons in a good-cavity laser. The system can operate with as few as 0.2 intracavity photons and with an effective excited state decay linewidth $<$ 1 Hz. This model system demonstrates key physics for future active optical clocks\footnote{D. Meiser, J. Ye, D. R. Carlson, M. J. Holland, Phys. Rev. Lett. {\bf 201}, 163601-163604 (2009)} (similar to masers) that may achieve frequency linewidths approaching 1 mHz due to greatly reduced sensitivity to thermal and environmental mirror noise. [Preview Abstract] |
Friday, June 8, 2012 11:00AM - 11:30AM |
U1.00002: Frequency combs and precision spectroscopy in the extreme ultraviolet Invited Speaker: Arman Cing\"oz Development of the optical frequency comb has revolutionized optical metrology and precision spectroscopy due to its ability to provide a precise link between microwave and optical frequencies. A novel application that aims to extend the precision and accuracy obtained to the extreme ultraviolet (XUV) is the generation of XUV frequency combs via intracavity high harmonic generation (HHG). Recently, we have been able to generate $>$ 200 $\mu$W average power per harmonic and demonstrate the comb structure of the high harmonics by resolving atomic argon and neon lines at 82 and 63 nm, respectively [1]. The argon transition linewidth of 10 MHz, limited by residual Doppler broadening, is unprecedented in this spectral region and places a stringent upper limit on the linewidth of individual comb teeth. To overcome this limitation, we have constructed two independent intracavity HHG sources to study the phase coherence directly via the heterodyne beats between them. With these developments, ultrahigh precision spectroscopy in the XUV is within grasp and has a wide range of applications that include tests of bound state quantum electrodynamics, development of nuclear clocks, and searches for variation of fundamental constants using the enhanced sensitivity of highly charged ions.\\[4pt] [1] Arman Cing\"oz et al., Nature {\bf 482}, 68 (2012). [Preview Abstract] |
Friday, June 8, 2012 11:30AM - 12:00PM |
U1.00003: Spins and photons: connecting quantum registers in diamond Invited Speaker: Lily Childress Long-lived electronic and nuclear spin states have made the nitrogen-vacancy (NV) defect in diamond a leading candidate for quantum information processing in the solid state. Multi-qubit quantum registers formed by single defects and nearby nuclear spins can currently be controlled and detected with high fidelity. Nevertheless, development of coherent connections between distant NVs remains an outstanding challenge. One advantage to working with solid-state defects is the opportunity to integrate them with microfabricated mechanical, electronic, or optical devices; in principle, such devices could mediate interactions between registers, turning them into nodes within a larger quantum network. In the last few months, several experiments have made key steps toward realizing a coherent quantum interface between individual NV centers using a mechanical quantum bus [1] or optical channels [2,3]. This talk will explore the current state of the art, and report on recent observation of two photon quantum interference between different gate-tunable defect centers [2]. These results pave the way towards measurement-based entanglement between remote NV centers and the realization of quantum networks with solid-state spins.\\[4pt] [1] Kolkowitz et al., Science 335, 1603 (2012)\newline [2] Bernien et al., Phys. Rev. Lett. 108, 043604 (2012)\newline [3] Sipahigil et al., http://lanl.arxiv.org/abs/1112.3975 [Preview Abstract] |
Friday, June 8, 2012 12:00PM - 12:30PM |
U1.00004: Antimatter Advances Include Trapped Antihydrogen in Its Ground State Invited Speaker: Phil Richerme Three recent advances in antimatter physics show significant progress towards precision tests of fundamental symmetries. The first and primary focus of this talk is ATRAP's observation of five simultaneously trapped antihydrogen atoms per trial, confined for long enough to ensure that they are in their ground state.\footnote{G. Gabrielse et al. (ATRAP Collaboration). Phys. Rev. Lett. \textbf{108}, 113002 (2012).} Large numbers of simultaneously trapped atoms are crucial if laser cooling and spectroscopy of antihydrogen at high levels of precision are to be achieved. Fundamental to this result is the careful control and characterization of the geometry and temperature of the large-number antiproton and positron plasmas from which antihydrogen is formed, along with enhanced event detection and cosmic ray background rejection techniques. A second advance, by the ALPHA collaboration, is a demonstration that smaller numbers of simultaneously trapped antihydrogen atoms can be ejected from a magnetic trap when microwaves flip the spin of the atoms.\footnote{C. Amole et al. (ALPHA Collaboration). Nature \textbf{483}, 439 (2012).} A third advance is a direct measurement of the proton magnetic moment to 2.5 parts per million using a technique that can be directly applied to an antiproton\footnote{J. DiSciacca and G. Gabrielse. Phys. Rev. Lett. \textbf{108}, 153001 (2012).} to improve the precision with which the antiproton magnetic moment is measured by a factor of 1000. [Preview Abstract] |
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