Time may be a human construct but that hasn't stopped physicists from perfecting it.

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JILA’s 3-D Quantum Gas Atomic Clock Offers New Dimensions in Measurement
https://www.nist.gov/news-events/news...
“JILA physicists have created an entirely new design for an atomic clock, in which strontium atoms are packed into a tiny three-dimensional (3-D) cube at 1,000 times the density of previous one-dimensional (1-D) clocks. In doing so, they are the first to harness the ultra-controlled behavior of a so-called “quantum gas” to make a practical measurement device.”

Jun Ye: Let There Be Light (and Thus, Time)
   • Jun Ye: Let There Be Light (and Thus,...  
Dr. Jun Ye, professor of physics at the University of Colorado at Boulder and a fellow of both the National Institute of Standards and Technology and JILA, explains how lasers are used to manipulate atoms inside and out for ultra-precise clocks.

Ultra-Accurate Clocks Lead Search for New Laws of Physics
https://www.quantamagazine.org/ultra-...
Atomic clocks are letting physicists tighten the lasso around elusive phenomena such as dark matter.

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