...experimentally confirmed, underpins emerging technologies such as Quantum cryptography & secure communication networks. These are evocative illustrations depicting entangled particles:
Credits: NASA science, BBC, Royalty-free image- pixaby

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Quantum entanglement famously described by Einstein as 'spooky action at a distance', occurs when two or more particles become inextricably linked, such that the Quantum state of one instantaneously influences the other-no matter how vast the separation
This phenomenon, now..
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A blue-violet laser illuminates the atom, causing it to absorb & re-emit light with sufficient intensity to be recorded by conventional camera. Here, the infinitesimal realm of quantum physics becomes tangible to our microscopic senses-a profound bridge between the very small & the observable world

The small, luminous point at the centre of this image is a single strontium atom-visible to the naked eye.
Courtesy: Physicist David Nadlinger, University of Oxford-the atom is held perfectly still by electric fields between two electrodes, then hit with the laser.
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