Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session M07: New Developments in Atomic ClocksInvited Live
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Sponsoring Units: GPMFC Chair: Shimon Kolkowitz, University of Wisconsin Room: E145-146 |
Thursday, June 4, 2020 8:00AM - 8:30AM Live |
M07.00001: Quantum metrology at the 19$^{th}$ decimal place Invited Speaker: David Leibrandt The tools of trapped-ion quantum logic can be used to enable and enhance precision measurements, with applications in time and frequency metrology and the search for physics beyond the standard model. In this talk, I will describe optical atomic clocks based on Al$^+$ which operate at this fertile intersection of fields. These clocks use quantum-logic gates with a co-trapped second ion species for preparation and readout of the Al$^+$ state, and offer the tantalizing prospect of Heisenberg-limited measurements with entangled ions. Recent progress, including an improved ion trap design and sympathetic laser cooling to the 3D ground state, has enabled total fractional systematic uncertainty below $10^{-18}$. We have performed frequency ratio measurements between Al$^+$, Sr, and Yb clocks with uncertainty below $10^{-17}$, which can be used to place constraints on possible temporal variations of fundamental constants and models of ultralight dark matter. [Preview Abstract] |
Thursday, June 4, 2020 8:30AM - 9:00AM Live |
M07.00002: Technologies for Portable Optical Clocks Invited Speaker: Robert McConnell Optical clocks are among the most accurate measurement devices ever built, now surpassing the $10^{-18}$ level of precision. Yet these impressive devices still typically occupy the volume of an entire atomic physics lab, being constrained in size by numerous free-space optics required to direct control lasers to the atomic reference sample as well as the bulk-cavity stabilization system required to narrow the interrogation laser’s linewidth to the requisite level. Many applications in navigation and communications could benefit from smaller-size, fieldable optical clocks which can still achieve high performance. In this talk, I will discuss two technologies we are developing at Lincoln Laboratory aimed at enabling compact, high-performance optical clocks based on trapped ions. First, I will discuss progress towards chip-based ion array traps able to deliver all necessary ion control wavelengths via on-chip photonics and incorporating on-chip avalanche photodiodes (APDs) for ion state readout . Secondly, I will discuss our recent demonstration of a fiber stimulated-Brillouin-scattering (SBS) laser used to run an optical $^{88}$Sr$^+$ ion clock, achieving short-term stability of $3.9 \times 10^{-14}/\sqrt{\tau}$ via a clock self-comparison measurement. [Preview Abstract] |
Thursday, June 4, 2020 9:00AM - 9:30AM Live |
M07.00003: New performance for optical atomic clocks with cryogenic silicon cavities Invited Speaker: William Milner A high performance optical local oscillator is essential for advancing the stability of an optical clock, which is key to realize optical lattice clocks with uncertainty at the 19th digit. To address this challenge, we present advances in cryogenic optical cavities based on crystalline silicon, together with enhanced precision measurement techniques utilizing our 1D and 3D strontium clocks. Leveraging the silicon cavities improved frequency stability and predictability, an all-optical time scale has been realized, surpassing the current state-of-the-art time scales. [Preview Abstract] |
Thursday, June 4, 2020 9:30AM - 10:00AM Live |
M07.00004: Transportable Optical Lattice Clocks to Test Gravitational Redshift Invited Speaker: Hidetoshi Katori Outstanding accuracy and stability of optical clocks allows measuring height differences of a centimetre via the gravitational redshift, which opens new application of clocks to chronometric levelling. So far, such state-of-the-art clocks offering 10$^{\mathrm{-18}}$ uncertainties have been solely demonstrated in well-conditioned laboratories. We develop a pair of transportable optical lattice clocks and demonstrate an 18-digit-precision frequency comparison in a broadcasting tower, TOKYO SKYTREE. The tower provides the clocks with a 450 m height difference to test gravitational redshift as well as adverse conditions to demonstrate the robustness of the clocks. Our experiment shows optical clocks resolving centimetres are technically ready for field applications, such as monitoring spatiotemporal changes of geopotentials caused by active volcanoes or crustal deformation and for defining the geoid. We also present our latest activities toward realizing compact and accurate clocks. \\ \\ In collaboration with: Ichiro Ushijima, The University of Tokyo, Noriaki Ohmae, RIKEN, Masao Takamoto, RIKEN [Preview Abstract] |
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