scholarly journals A Fermi-degenerate three-dimensional optical lattice clock

Science ◽  
2017 ◽  
Vol 358 (6359) ◽  
pp. 90-94 ◽  
Author(s):  
S. L. Campbell ◽  
R. B. Hutson ◽  
G. E. Marti ◽  
A. Goban ◽  
N. Darkwah Oppong ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Three Dimensional ◽  
Measurement Precision ◽  
Frequency Shifts ◽  
Degenerate Fermi Gas ◽  
Atomic Interactions ◽  
Optical Lattice Clock ◽  
Clock Stability ◽  
Averaging Time ◽  
Clock Comparison

Strontium optical lattice clocks have the potential to simultaneously interrogate millions of atoms with a high spectroscopic quality factor of 4 × 1017. Previously, atomic interactions have forced a compromise between clock stability, which benefits from a large number of atoms, and accuracy, which suffers from density-dependent frequency shifts. Here we demonstrate a scalable solution that takes advantage of the high, correlated density of a degenerate Fermi gas in a three-dimensional (3D) optical lattice to guard against on-site interaction shifts. We show that contact interactions are resolved so that their contribution to clock shifts is orders of magnitude lower than in previous experiments. A synchronous clock comparison between two regions of the 3D lattice yields a measurement precision of 5 × 10–19 in 1 hour of averaging time.

scholarly journals Precision measurement and frequency metrology with ultracold atoms

2016 ◽  
Vol 3 (2) ◽  
pp. 189-200 ◽  
Author(s):  
Xibo Zhang ◽  
Jun Ye
Keyword(s):  
Precision Measurement ◽  
Optical Lattice ◽  
Ultracold Atoms ◽  
Measurement Precision ◽  
Future Research ◽  
Total Uncertainty ◽  
Research Activities ◽  
Systematic Effects ◽  
Optical Lattice Clock ◽  
Frequency Metrology

Abstract Precision measurement and frequency metrology have pushed many scientific and technological frontiers in the field of atomic, molecular and optical physics. In this article, we provide a brief review on the recent development of optical atomic clocks, with an emphasis placed on the important inter-dependence between measurement precision and systematic effects. After presenting a general discussion on the motivation and techniques behind the development of optical lattice clocks, where the use of many atoms greatly enhances the measurement precision, we present the JILA strontium optical lattice clock as the leading system of frequency metrology with the lowest total uncertainty, and we describe other related research activities. We discuss key ingredients that have enabled the optical lattice clocks with ultracold atoms to reach the 18th digit in both precision and accuracy. Furthermore, we discuss extending the power of precision clock spectroscopy to study quantum many-body physics and to provide control for atomic quantum materials. In addition, we explore future research directions that have the potential to achieve even greater precision.

Three-dimensional optical lattice clock with bosonicSr88atoms

2010 ◽  
Vol 81 (2) ◽  
Author(s):  
Tomoya Akatsuka ◽  
Masao Takamoto ◽  
Hidetoshi Katori
Keyword(s):  
Optical Lattice ◽  
Three Dimensional ◽  
Optical Lattice Clock

Geodetic determination of the gravitational potential difference for an optical lattice clock comparison in the Kanto region in Japan

2020 ◽  
Author(s):  
Yoshiyuki Tanaka ◽  
Yosuke Aoki ◽  
Ryuichi Nishiyama
Keyword(s):  
Gravitational Potential ◽  
Optical Lattice ◽  
Measurement Errors ◽  
Vertical Motion ◽  
Basic Research ◽  
Potential Difference ◽  
Geoid Model ◽  
Optical Lattice Clock ◽  
Scale Network ◽  
Clock Comparison

<p><span>Recent advancements in atomic clocks have enabled us to measure gravitational potential differences with a precision which is applicable to geodetic uses, based on the gravitational red shift. In Europe, international fiber networks linking optical clocks have been developed for promoting the unification of height reference systems across countries, and 10 cm-level agreements in terms of the equivalent height difference to the gravitational potential have been achieved in the comparisons between chronometric and classical geodetic methods. In Japan, similar comparisons using two optical lattice clocks were carried out for i) a 15-km fiber connecting RIKEN in Wako city and the Hongo campus of the University of Tokyo and ii) a 450-m fiber link which vertically connected the observatory and the ground at the Tokyo Skytree. For the former comparison, agreement between chronometric and geodetic results was better than 10 cm, and for the latter, data are under analysis. A new clock site has been developed at the NTT Basic Research Laboratories in Atsugi City. Clocks in Wako, Hongo and Atsugi constitute an approximately 100-km-scale network. In this presentation, we report a preliminary result on the geodetic leveling survey to determine the gravitational potential difference between these three sites. To estimate uncertainties in the potential difference, we will compare the result partially with those determined from the geoid model and the GNSS ellipsoidal height. We will also consider the effects of crustal vertical motion, in addition to measurement errors.</span></p>

scholarly journals Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center

2018 ◽  
Vol 8 (11) ◽  
pp. 2194 ◽  
Author(s):  
Yebing Wang ◽  
Xiaotong Lu ◽  
Benquan Lu ◽  
Dehuan Kong ◽  
Hong Chang
Keyword(s):  
Optical Lattice ◽  
Closed Loop ◽  
Frequency Instability ◽  
Frequency Noise ◽  
Allan Deviation ◽  
Service Center ◽  
Space Applications ◽  
Time Service ◽  
Optical Lattice Clock ◽  
Averaging Time

We review recent experimental progress concerning the 87Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the 87Sr clock transition for the optical lattice clock was performed, and closed-loop operation of the optical lattice clock was realized. A fractional frequency instability of 2.8 × 10−17 was attained for an averaging time of 2000 s. The Allan deviation is found to be 1.6 × 10−15/τ1/2 and is limited mainly by white-frequency-noise. The Landé g-factors of the (5s2)1S0 and (5s5p)3P0 states in 87Sr were measured experimentally; they are important for evaluating the clock’s Zeeman shifts. We also present recent work on the miniaturization of the strontium optical lattice clock for space applications.

scholarly journals Frequency Shifts in an Optical Lattice Clock Due to Magnetic-Dipole and Electric-Quadrupole Transitions

2008 ◽  
Vol 101 (19) ◽  
Author(s):  
A. V. Taichenachev ◽  
V. I. Yudin ◽  
V. D. Ovsiannikov ◽  
V. G. Pal’chikov ◽  
C. W. Oates
Keyword(s):  
Magnetic Dipole ◽  
Optical Lattice ◽  
Electric Quadrupole ◽  
Frequency Shifts ◽  
Optical Lattice Clock

ON THE OPTICAL POTENTIAL OF AN ATTRACTIVE NONRELATIVISTIC DEGENERATE ELECTRON GAS INTERACTING WITH NUCLEAR MATTER

2012 ◽  
Vol 26 (31) ◽  
pp. 1250210 ◽  
Author(s):  
M. A. GRADO-CAFFARO ◽  
M. GRADO-CAFFARO
Keyword(s):  
Nuclear Matter ◽  
Optical Potential ◽  
Electron Gas ◽  
Three Dimensional ◽  
Harmonic Oscillators ◽  
Fermi Velocity ◽  
Potential Well ◽  
Schwinger Model ◽  
Degenerate Fermi Gas ◽  
Degenerate Electron Gas

The optical potential of an attractive nonrelativistic electron gas interacting with nuclear matter is determined on the basis of the concept of degenerate Fermi gas. In fact, the involved electrons are treated as three-dimensional quantum harmonic oscillators confined at the surface of a spherical (approximately ideal) potential well. Within this picture, the Fermi velocity is calculated as well as the spatial electron density at the surface of the potential well and the attractive force between the electron gas and the nuclear matter. In addition, considerations related to the Lippmann–Schwinger model are made.

scholarly journals Spin–orbit-coupled fermions in an optical lattice clock

Nature ◽  
2016 ◽  
Vol 542 (7639) ◽  
pp. 66-70 ◽  
Author(s):  
S. Kolkowitz ◽  
S. L. Bromley ◽  
T. Bothwell ◽  
M. L. Wall ◽  
G. E. Marti ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Spin Orbit ◽  
Optical Lattice Clock
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