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Scientists from Scotland photographed for the first time a photograph of a phenomenon that Albert Einstein had once described as "a spooky action at a distance".
The image is a strong form of quantum entanglement, where two particles interact and share their physical states for a moment, regardless of the distance that separates them.
This connection is known as the Bell entanglement and underlies the field of quantum mechanics.
Paul-Antoine Moreau, of the School of Physics and Astronomy at the University of Glasgow, said: "The image that we managed to capture is an elegant demonstration of" a fundamental property of nature, seen for the very first time in the form of an image. . This is an exciting result that could be used to advance the emerging field of quantum computing and lead to new types of imagery. "
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Einstein thought quantum mechanics was "phantasmagorical" because of the immediacy of the apparent interaction at a distance between two entangled particles. This seemed incompatible with elements of his special theory of relativity.
The scientist Sir John Bell then formalized this concept by describing a strong form of entanglement exhibiting this characteristic. The entanglement of Bell is now being exploited in practical applications such as quantum computing and cryptography, but it has never been captured before in a single image.
The team of physicists at the University of Glasgow recorded the phenomenon after developing a system that pulls a stream of entangled photons from a quantum light source onto "unconventional" objects – displayed on crystal materials liquids that alter the phase of the photons as they pass through.
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