Bulletin of the American Physical Society
47th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 61, Number 8
Monday–Friday, May 23–27, 2016; Providence, Rhode Island
Session P2: Invited Session: Precision Laser SpectroscopyInvited

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Sponsoring Units: GPMFC Chair: John Doyle, Harvard Univeristy Room: Ballroom B 
Thursday, May 26, 2016 2:00PM  2:30PM 
P2.00001: Frequency ratios of optical lattice clocks at the 17th decimal place Invited Speaker: Hidetoshi Katori Optical lattice clocks benefit from a low quantumprojection noise by simultaneously interrogating a large number of atoms, which are trapped in an optical lattice tuned to the “magic wavelength” to largely cancel out light shift perturbation in the clock transition. About a thousand atoms enable the clocks to achieve 10$^{\mathrm{18}}$ instability in a few hours of operation, allowing intensive investigation and control of systematic uncertainties. As optical lattice clocks have reached inaccuracies approaching 10$^{\mathrm{18}}$, it is now the uncertainty of the SI second (\textasciitilde 10$^{\mathrm{16}})$ itself that restricts the measurement of the absolute frequencies of such optical clocks. Direct comparisons of optical clocks are, therefore, the only way to investigate and utilize their superb performance beyond the SI second. In this presentation, we report on frequency comparisons of optical lattice clocks with neutral strontium ($^{\mathrm{87}}$Sr), ytterbium ($^{\mathrm{171}}$Yb) and mercury ($^{\mathrm{199}}$Hg) atoms. By referencing cryogenic Sr clocks, we determine frequency ratios, $\nu_{\mathrm{Yb}}$/$\nu_{\mathrm{Sr}}$ and $\nu_{\mathrm{Hg}}$/$\nu_{\mathrm{Sr}}$, of a cryogenic Yb clock and a Hg clock with uncertainty at the mid 10$^{\mathrm{17}}$ level. Such ratios provide an access to search for temporal variation of the fundamental constants. We also present remote comparisons between cryogenic Sr clocks located at RIKEN and the University of Tokyo over a 30kmlong phasestabilized fiber link. The gravitational red shift $\Delta \nu $/$\nu_{\mathrm{0}} \quad \approx $ 1.1×10$^{\mathrm{18}} \quad \Delta h$ cm$^{\mathrm{1}}$ reads out the height difference of $\Delta h$\textasciitilde 15 m between the two clocks with uncertainty of 5 cm, which demonstrates a step towards relativistic geodesy. [Preview Abstract] 
Thursday, May 26, 2016 2:30PM  3:00PM 
P2.00002: Using optical clock to probe quantum manybody physics Invited Speaker: Jun Ye The progress of optical lattice clock has benefited greatly from the understanding of atomic interactions. At the same time, the precision of clock spectroscopy has been applied to explore manybody spin interactions including SU($N)$ symmetry. Our recent work on this combined front of quantum metrology and manybody physics includes the probe of spinorbital physics in the lattice clock and the investigation of a Fermi degenerate gas of 10$^{\mathrm{5}} \quad^{\mathrm{87}}$Sr atoms in a threedimensional magicwavelength optical lattice. [Preview Abstract] 
Thursday, May 26, 2016 3:00PM  3:30PM 
P2.00003: Spectroscopy and quantum control of cryogenically buffered polyatomic molecules Invited Speaker: David Patterson Cold polyatomic molecules offer rich possibilities for precision measurement, quantum control, and tests of fundamental symmetries.~ While manipulating, cooling, and detecting atoms and certain diatomic molecules at the single quantum state level is now possible, analogous tools for controlling polyatomic molecules lag far behind.~ Buffer gas cooling has emerged as a versatile tool for cooling such molecules.~ We will present recent demonstrations of statespecific and enantiomerspecific preparation of chiral molecules, and novel sensitive and ultraspecific chemical analysis techniques enabled by the combination of modern microwave spectroscopy techniques and the broad applicability of cryogenically buffered molecular samples.~ [Preview Abstract] 
Thursday, May 26, 2016 3:30PM  4:00PM 
P2.00004: Precision Spectroscopy of Atomic Hydrogen and the Proton Size Puzzle Invited Speaker: Thomas Udem Precise determination of transition frequencies of simple atomic systems are required for a number of fundamental applications such as tests of quantum electrodynamics (QED), the determination of fundamental constants and nuclear charge radii. The sharpest transition in atomic hydrogen occurs between the metastable 2S state and the 1S ground state. Its transition frequency has now been measured with almost 15 digits accuracy using an optical frequency comb and a cesium atomic clock as a reference. A recent measurement of the Lamb shift in muonic hydrogen is in significant contradiction to the hydrogen data if QED calculations are assumed to be correct. We hope to contribute to the resolution of this so called ‘proton size puzzle’ by providing additional experimental input from the hydrogen side. [Preview Abstract] 
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