Scientists have captured the first ever image of a phenomenon which Albert Einstein oncedescribed as "spooky action at a distance".
The photo shows a strong form of quantum entanglement, where two particles interact andshare their physical states for an instant.
It occurs no matter how great the distance between the particles is.
The connection is known as Bell entanglement and underpins the field of quantum mechanics.
Paul-Antoine Moreau, of the University of Glasgow's School of Physics and Astronomy, said theimage was "an elegant demonstration of a fundamental property of nature".
He added: "It's an exciting result which could be used to advance the emerging field ofquantum computing and lead to new types of imaging."
Einstein described quantum mechanics as "spooky" because of the instantaneousness of theapparent remote interaction between two entangled particles.
The interaction also seemed incompatible with elements of his special theory of relativity.
Scientist John Bell later formalised the concept by describing in detail a strong form ofentanglement exhibiting the feature.
Bell entanglement is now harnessed in practical applications such as quantum computing andcryptography.
However, it has never before been captured in a single image.
The team of physicists from the University of Glasgow devised a system that fired a stream ofentangled photons from a quantum source of light at "non-conventional" objects.
This was displayed on liquid-crystal materials which change the phase of the photons as theypass through.