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Scientists are hoping to redefine the second – here's why (theconversation.com)

submitted 1 year ago by [email protected] to c/[email protected]

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[–] [email protected] 100 points 1 year ago

The most relevant paragraph:

Now, using a new way of linking the clocks with ultra-fast lasers, researchers have shown that different kinds of optical atomic clocks can be placed a few kilometres apart and still agree within 1 part in 10¹⁸. This is just as good as previous measurements with pairs of identical clocks a few hundred metres apart, but about a hundred times more precise than achieved before with different clocks or large distances.