Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

55.9K
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
55.9K
Propagation of Uncertainty from Systematic Error01:10

Propagation of Uncertainty from Systematic Error

1.6K
The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
1.6K
Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

113.9K
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
113.9K
Random and Systematic Errors01:20

Random and Systematic Errors

16.2K
Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
16.2K
Random and Systematic Errors01:20

Random and Systematic Errors

957
957
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

3.8K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
3.8K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Lunar silicon cavity.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Dispersive-wave-agile optical frequency division.

Nature photonics·2025
Same author

Monolithic optical resonator for ultrastable laser and photonic millimeter-wave synthesis.

Communications physics·2024
Same author

Photonic chip-based low-noise microwave oscillator.

Nature·2024
Same author

Emergence of multi-body interactions in a fermionic lattice clock.

Nature·2018
Same author

Ultrafast electro-optic light with subcycle control.

Science (New York, N.Y.)·2018

Related Experiment Video

Updated: Apr 14, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

7.5K

Systematic evaluation of an atomic clock at 2 × 10(-18) total uncertainty.

T L Nicholson1,2, S L Campbell1,2, R B Hutson1,2

  • 1JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440, USA.

Nature Communications
|April 22, 2015
PubMed
Summary

Researchers developed a strontium (Sr) optical lattice clock achieving unprecedented stability and accuracy. This advancement in atomic clocks promises to enhance quantum science, fundamental physics tests, and relativity research.

More Related Videos

Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

8.5K
In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
07:03

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

Published on: June 13, 2020

4.3K

Related Experiment Videos

Last Updated: Apr 14, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

7.5K
Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

8.5K
In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
07:03

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

Published on: June 13, 2020

4.3K

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Science and Technology
  • Metrology

Background:

  • Atomic clocks are crucial for advancements in quantum science, fundamental constant variation, and relativity tests.
  • Optical lattice clocks represent the current state-of-the-art in atomic clock technology.
  • Many-particle atomic clocks offer significant potential for further improvements.

Purpose of the Study:

  • To enhance the stability and accuracy of a strontium-87 (87Sr) optical lattice clock.
  • To perform a new, high-precision evaluation of the clock's accuracy by reducing systematic uncertainties.
  • To contribute to the realization of the full potential of many-particle atomic clocks.

Main Methods:

  • Utilized a state-of-the-art stable laser system for the 87Sr optical lattice clock.
  • Implemented advanced techniques to reduce systematic uncertainties in clock operation.
  • Conducted rigorous evaluation of clock stability and accuracy.

Main Results:

  • Achieved a fractional stability of 2.2 × 10(-16) at 1 second for the 87Sr optical lattice clock.
  • Significantly reduced systematic uncertainties, including lattice ac Stark shift and thermal environment effects.
  • Attained a combined total uncertainty of 2.1 × 10(-18) in fractional frequency units for the JILA Sr clock.

Conclusions:

  • The JILA 87Sr optical lattice clock demonstrates record-breaking stability and accuracy.
  • This advancement paves the way for more precise tests of fundamental physics and improved quantum technologies.
  • The results highlight the potential of many-particle atomic clocks for future scientific exploration.