Few things in the Universe keep the beat as reliably as an atom's pulse.
As fine-tuned as this technology happens to be, there comes a point when the very rules of time-keeping themselves become a little vague thanks to the uncertainties of the quantum landscape that introduce a bunch of catch-22 situations.
A 'single shot' reading with the right kind of laser pulse would be ideal. Physicists know that the uncertainty of this approach can be improved if the atom being measured has already had its fate entangled with another.is at once an intuitive and bizarre concept. According to quantum mechanics, objects can't be said to have a value or state until they're observed.
The two 'coins' in this case were a pair of strontium ions, entangled with a photon that was sent down a short length of optic fiber.
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