, is so accurate that it wouldn't have lost a second over the universe's entire existence of more than 13 billion years.Optical atomic clocks keep time by using a laser that is tuned to precisely match this frequency.“a relatively lousy laser"
Their findings were proof that they could run essential experiments for much longer than their laser would allow in a normal optical clock. Next, the group wanted to figure out how precisely they could measure differences between the clocks. Depending on gravity,
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