Comment Re:ELI5 (Score 3, Informative) 17
It's really not all that hard. You know how in some small streams and fountains, bumps can form in the water? They're not really "there" because they are really caused by the underlying water streams colliding, rubbing, moving at different velocities; every time you interact with them, the water is completely different. And yet, in a certain sense they are there, because if you skipped a stone across the stream, and it hit one of these structures, it would bounce off. And would do so no matter how many times you did it. Physicists call these "quasi-particles".
These Hopfion's are quasiparticles. Except instead of being made of moving water, they're (typically) made of crystals made of Iron, Iridium, Platinum (just as one example) that have been excited by lasers. And like "real" particles, they can interact with each other (often in unique ways), making them able to do computation and store information.
However, despite the hype, doubt they'd be useful for any kind of long term storage. Typically systems depend on being energized by lasers constantly. Like bumps in the water when the stream dries up, they lose all their information when the lasers are turned off.