来自MSN1 年
Chinese scientists build ultra-precise clock they hope will help redefine the second
Using ultra-cold strontium atoms and powerful laser beams, the team at the University of Science and Technology of China created a clock with stability and uncertainty under 5 quintillionths. The ...
Redefining the second: Optical atomic clock achieves record accuracy in comparison measurement
The next generation of atomic clocks "ticks" with the frequency of a laser. This is about 100,000 times faster than the ...
Optics7 天
Optical atomic clock achieves record accuracy redefining the second
In an optical atomic clock, atoms are irradiated with laser light. If the laser has exactly the right frequency, the atoms change their quantum mechanical state. All external influences on the atoms ...
来自MSN1 个月
A breakthrough in timekeeping: Progress toward a nuclear clock
Ye and colleagues showed this summer that their strontium clock would lose a fraction of a second over the age of the universe — 13.8 billion years. Despite these mind-boggling gains in accuracy ...
Nature2 年
Possibilities open up in time
What Katori proposed in the optical lattice clock was to measure the transition in energy states among a batch of neutral strontium atoms, laser-cooled and trapped into a lattice formed by laser ...
Physics World21 天
Solid-state nuclear clocks brought closer by physical vapour deposition
Today, the world’s most precise atomic clocks are the strontium optical lattice clocks created by Jun Ye’s group at JILA in Boulder, Colorado. These are accurate to within a second in the age of the ...