You can see the photo at the top of this page: the fuzzy grey image is actually a composite of multiple images of the photons as they go through a series of four phase transitions. It was captured by physicists at the University of Glasgow in Scotland and is the first time we've seen the particle interaction that underpins the strange science of quantum mechanics and forms the basis of quantum computing.
Quantum entanglement occurs when two particles become inextricably linked, and whatever happens to one immediately affects the other, regardless of how far apart they are. This particular photo shows entanglement between two photons (light particles). They're interacting and, for a brief moment, sharing physical states.
Paul-Antoine Moreau, first author of the paper wherein the image was unveiled, and a team of physicists, created a system that blasted out streams of entangled photons at what they described as 'non-conventional objects'. The experiment involved capturing four images of the photons under four different phase transitions.
The physicists split the entangled photons up and ran one beam through a liquid crystal material known as β-barium borate, triggering four phase transitions. At the same time, they captured photos of the entangled pair going through the same phase transitions, even though it hadn't passed through the liquid crystal.
You can see the setup below: The entangled beam of photons comes from the bottom left, one half of the entangled pair splits to the left and passes through the four phase filters. The others that go straight ahead didn't go through the filters, but underwent the same phase changes. The camera was able to capture images of these at the same time, showing that they'd both shifted the same way despite being split. In other words, they were entangled.
Images: (Moreau et al., Science Advances, 2019)