Read article: New definition of second ticks closer after international optical-clock comparison
Fibre and satellites connections span two continents
Read article: The evolution of the metre: How a product of the French Revolution became a mainstay of worldwide scientific collaboration
Physics World corresponding editor Isabelle Dumé reports from a Paris symposium celebrating the 150th anniversary of the Metre Convention
Read article: Magnetically launched atoms sense motion
New method in atom interferometry is used for inertial sensing
Read article: Thermometer uses Rydberg atoms to make calibration-free measurements
New technique uses black-body radiation to make direct measurements with low uncertainty
Read article: New candidate emerges for a universal quantum electrical standard
Approach based on the quantum anomalous Hall effect does away with the need for applied magnetic fields
Read article: Solid-state nuclear clocks brought closer by physical vapour deposition
Fabrication technique reduces amount of expensive isotope needed
Read article: Multi-qubit entangled states boost atomic clock and sensor performance
Greenberger–Horne–Zeilinger states increase measurement frequency
Read article: Nuclear clock ticks ever closer
New device could not only be the best time-keeper ever, it could also revolutionize fundamental physics studies
Read article: The most precise timekeeping device ever built
Colorado-based researchers have reduced the systematic uncertainty in their optical lattice clock to a record low. Ali Lezeik explains how they did it
Read article: Atomic clocks on the Moon could create ‘lunar positioning system’
Lunar time standard would avoid pitfalls of time dilation
