Bulletin of the American Physical Society
49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 63, Number 5
Monday–Friday, May 28–June 1 2018; Ft. Lauderdale, Florida
Session U08: Precision Measurements |
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Chair: Cass Sackett, University of Virginia Room: Grand F |
Friday, June 1, 2018 8:00AM - 8:12AM |
U08.00001: Deterministic generation of a spin-1 Dicke state with more than 10000 atoms Yi-Quan Zou, Ling-Na Wu, Qi Liu, Xin-Yu Luo, Shuai-Feng Guo, Jia-Hao Cao, Meng Khoon Tey, Li You We report the first generation of a spin-1 Dicke state in the close vicinity of $|l=N,m=0\rangle$ with $N \sim 11700$ $^{87}$Rb atoms. A spinor Bose-Einstein condensate supports various quantum phases due to competition between spin-exchange interaction and quadratic Zeeman energy. In the zero magnetization subspace and assuming the same spatial wave function for all spin components, the ground state of a spin-1 condensate at vanishing magnetic field (or zero quadratic Zeeman shift) is a balanced (or zero magnetization) spin-1 Dicke state. We experimentally generate this spin-1 Dicke state by slowly sweeping the effective quadratic Zeeman shift through a quantum phase transition point from an initial $m_F=0$ condensate. The prepared state is of exceptional quality. It implicates entanglement among all atoms and allows for the demonstration of quantum enhanced measurement. [Preview Abstract] |
Friday, June 1, 2018 8:12AM - 8:24AM |
U08.00002: A Compact Optical Atomic Clock Based on a Two-Photon Transition in Rubidium Benjamin Stuhl, Kyle Martin, Gretchen Phelps, Nathan Lemke We present an optical rubidium atomic frequency standard (O-RAFS), based upon a two-photon transition at 778 nm, that utilized readily available commercial off-the-shelf components. Compared to existing GPS clocks, O-RAFS offers reduced short-term instability, improved manufacturability, and competitive size, weight, and power, making it an attractive candidate for future space operation. [Preview Abstract] |
Friday, June 1, 2018 8:24AM - 8:36AM |
U08.00003: Theoretical investigation of Black-body Zeeman Shifts in Microwave Atomic Clock Jize Han, Yani Zuo, Jianwei Zhang, Lijun Wang With the development of microwave atomic clocks, black-body radiation Zeeman shifts need to be considered carefully. In this Letter, the frequency shifts of hyperfine splitting of ground state due to black-body magnetic field are investigated. The relative frequency shifts of different alkali atoms and alkali-like ions which could be candidates of microwave atomic clocks are calculated, and results are from -0.977E-17[T(K)/300]\textasciicircum 2 to 1.947E-17[T(K)/300]\textasciicircum 2 for different atoms. These results are consistent with previous works but with more precision, detailed derivations and clear physical pictures. [Preview Abstract] |
Friday, June 1, 2018 8:36AM - 8:48AM |
U08.00004: Precision Spectroscopy of Feshbach and Efimov Resonances of \textsuperscript{39}K Roman Chapurin, Xin Xie, Michael Van de Graaff, Carlos Lopez-Abadia, Jared Popowski, Jun Ye, Eric Cornell We measure the precise locations of Feshbach and Efimov resonances in \textsuperscript{39}K. We measure molecular binding energies down to a few-kilohertz level using dimer-dissociation spectroscopy. The stability of our magnetic field and the absence of monomers in our molecular gas enables us to determine the location of the Feshbach resonance with an uncertainty less than $10^{-4}$ of its width. The position of the first Efimov state is determined by measuring three-body loss rates, taking into account finite density and temperature effects. [Preview Abstract] |
Friday, June 1, 2018 8:48AM - 9:00AM |
U08.00005: Polarization Sensitive 3-color Broadband Coherent Raman Spectroscopy (PS-3CBCRS) Laszlo Ujj, Trevor Olsson, Patrick Fowler We report the recent progress of construction and characterization of a coherent Raman tabletop system utilizing a novel broadband nanosecond optical parametric oscillator and volumetric Bragg filters assisting a PS-3CBCRS measuring system. To illustrate the versatility of the system and precision of the measurements to reveal the molecular information, we selected two chemicals. Polarization sensitive epi-detected 3CBCRS spectra of liquid CCl$_{\mathrm{4}}$ and DCVJ were recorded and analyzed. By changing the polarization angles of the actinic laser waves, the vibrational bands resembled the Lorentzian line-shapes extracted from dispersive spectra by non-model dependent spectral processing methods. Electronic resonance enhanced PS-3CBCRS spectra of DCVJ was recorded for the first time. The new outcomes are additions to our recently reported 3CBCRS results on liquid and crystal samples. [Preview Abstract] |
Friday, June 1, 2018 9:00AM - 9:12AM |
U08.00006: Abstract Moved to J09.10 Abstract moved to session J09.10. [Preview Abstract] |
Friday, June 1, 2018 9:12AM - 9:24AM |
U08.00007: Accurate Determination of the Dynamical Polarizability of Dysprosium . Emil Kirilov, Cornelis Ravensbergen, Vincent Corre, Elisa Soave, Marian Kreyer, Slava Tzanova, Rudolf Grimm We report a measurement of the dynamical polarizability of dysprosium atoms in their electronic ground state at the optical wavelength of 1064 nm, which is of particular interest for laser trapping experiments. Our method is based on collective oscillations in an optical dipole trap, and reaches unprecedented accuracy and precision by comparison with an alkali atom (potassium) as a reference species. Our experiments have reached a level that permits meaningful tests of current theoretical descriptions and provides valuable information for future experiments utilizing the intriguing properties of heavy lanthanide atoms. In our future experiments, we are particularly interested in mass-imbalanced Fermi-Fermi mixtures and possible new superfluid pairing regimes. [Preview Abstract] |
Friday, June 1, 2018 9:24AM - 9:36AM |
U08.00008: Rydberg Electromagnetically-Induced Transparency and Autler-Townes Splitting in the Presence of Band-Limited White Gaussian Noise Matthew Simons, Marcus Kautz, Christopher Holloway, David Anderson, Georg Raithel, Daniel Stack, Marc St. John, Wansheng Su Rydberg electromagnetically-induced transparency (EIT) and Autler-Townes (AT) splitting in an alkali vapor constitute a promising approach to self-calibrated, SI-traceable radio frequency (RF) electric field (E-field) measurements. In order for this method to become an accepted metrology standard it is necessary to understand the effect of RF noise. We investigate the effect of band-limited white Gaussian noise (BLWGN) on EIT/AT-based RF E-field measurements, for noise bands centered around the measurement frequency as well as blue- and red-shifted noise bands. We characterize the conditions under which RF E-field measurements can be severely distorted by the BLWGN, and provide a theoretical model to predict these effects. [Preview Abstract] |
Friday, June 1, 2018 9:36AM - 9:48AM |
U08.00009: Toward Unitary Spin Squeezing for Atomic Clocks Boris Braverman, Akio Kawasaki, Edwin Pedrozo, Chi Shu, Simone Colombo, Zeyang Li, Vladan Vuletic Improving the precision of sensors using entanglement is a major goal in quantum metrology. Techniques for producing spin squeezing in atomic systems are often non-unitary, generating more anti-squeezing than the minimum prescribed by the uncertainty principle. We find that non-unitary squeezing significantly impedes the potential improvements from squeezing in atomic clocks and other quantum sensors. I will present the method and realization of near-unitary spin squeezing with $\mathrm{^{171}Yb}$ atoms by off-resonant probing in a high-finesse optical resonator. This technique will allow for the creation of quantum states with metrologically useful entanglement on the clock transition of $\mathrm{^{171}Yb}$. [Preview Abstract] |
Friday, June 1, 2018 9:48AM - 10:00AM |
U08.00010: Classical, Digital Communication via Rydberg Electrometry David Meyer, Kevin Cox, Fredrik Fatemi, Paul Kunz Quantum sensors based on thermal neutral atoms have shown record sensitivity to electric and magnetic fields. Applied to modulated fields, these sensors have the potential to improve on the current limitations of classical sensors for digital communication. Here we report the use of Rydberg atoms in a thermal vapor to measure amplitude-modulated RF electric fields. The modulation is detected via Electromagnetically Induced Transparency (EIT) using an optical heterodyne measurement. We implement a phase-shift-keying protocol to transmit digital information via the amplitude modulation and measure a photon-shot-noise limited channel capacity in excess of 5 Mbit/s. The bandwidth limit of this measurement is investigated and found to be limited by the EIT pumping rate in the low RF power regime. [Preview Abstract] |
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