The first network of quantum entangled atomic clocks

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Nahid#13
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The first network of quantum entangled atomic clocks

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The feat could help make these clocks so precise that they start approaching the fundamental limit of precision set by quantum mechanics. Atomic clocks measure time by measuring the vibrational patterns of atoms, which are incredibly stable and predictable. For example, the cesium-133 atom will oscillate exactly 9,192,631,770 times per second, and this number has been used to officially define the second since 1967, setting national and international timekeeping standards. See also: "Quantum flute" moves light incredibly But there is always room for improvement. Optical atomic clocks that use visible light and atoms such as ytterbium.

The potential to surpass cesium atomic clocks, and now Oxford physicists have shown how to make them even more precise. This requires exploiting a ghostly quantum phenomenon Bahamas Mobile Number List called quantum entanglement. Particles can become so intertwined that measuring or changing one will immediately affect the other, no matter how far apart they are. Theoretically, these two particles could be on opposite sides of the universe and still interact instantly. This idea troubled Einstein himself, but it has been experimentally confirmed for decades. MIT physicists have previously used quantum entanglement to improve the accuracy of atomic clocks by entangling a cloud of atoms in a single device.

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Now the Oxford team has entangled two separate atomic clocks from across the room. Each of the atomic clocks contained a single strontium ion. The laser beam is split in two, and then each beam is modulated in exactly the same way before being sent to each of the atomic clocks to hit the strontium ions. This generates a quantum entanglement connection between the ions even though they are 2 m (6.6 ft.) apart. The end result is the first quantum network of entangled atomic clocks that can be used to measure time more accurately than ever before. Researchers have doubled the measurement uncertainty.
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