Quantum physics is a fascinating yet complicated subject to understand, and one of the things that freaks out physics students every is the concept of entanglement. That occurs when physicists attempt to measure the state of a particle and that affects the state of another particle instantly. (In reality, the particles are in multiple states — spinning in multiple directions, for example — and can only be said to be in one state or another when they are measured.)
“Spooky action at a distance” is how Albert Einstein reportedly referred to it. Here’s the new bit about this: Julian Sonner, a senior postdoctoral researcher at the Massachusetts Institute of Technology, led research showing that when two of these quarks are created, string theory creates a wormhole linking the quarks.
According to MIT, this could help researchers better understand the link between gravity (which takes place on a large scale) to quantum mechanics (which takes place on a very tiny scale). As MIT puts it, up to now it’s been very hard for physicists to “explain gravity in quantum-mechanical terms”, giving rise to a preoccupation of coming up with a single unifying theory for the universe. No luck yet, but many people believe it exists.
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“There are some hard questions of quantum gravity we still don’t understand, and we’ve been banging our heads against these problems for a long time,” Sonner stated. “We need to find the right inroads to understanding these questions.”
Quantum entanglement sounds so foreign to our experience because it appears to exceed the speed of light, which violates Einstein’s general relativity. (The speed limit is still being tested, of course, which is why scientists were so excited when it appeared particles were moving faster than light in a 2011 experiment that was later debunked due to a faulty sensor.)
Anyway, this is how the new research proceeded:
– Sonner examined the work of Juan Maldacena of the Institute for Advanced Study and Leonard Susskind of Stanford University. The physicists were looking at how entangled black holes would behave. “When the black holes were entangled, then pulled apart, the theorists found that what emerged was a wormhole — a tunnel through space-time that is thought to be held together by gravity. The idea seemed to suggest that, in the case of wormholes, gravity emerges from the more fundamental phenomenon of entangled black holes,” MIT stated.
– Sonner then set about to create quarks to see if he could watch what happens when two are entangled with each other. Using an electric field, he was able to catch pairs of particles coming out of a vacuum environment with a few “transient” particles in it.
– Once he caught the particles, he mapped them in terms of space-time (four-dimensional space). Note: gravity is believed to be the fifth dimension because it can bend space-time, as you can see in these images of galaxies below.
– Sonner then tried to figure out what would happen in the fifth dimension when quarks were entangled in the fourth dimension, using a string theory concept called holographic duality. “While a hologram is a two-dimensional object, it contains all the information necessary to represent a three-dimensional view. Essentially, holographic duality is a way to derive a more complex dimension from the next lowest dimension,” MIT stated.
– And it was under holographic duality that Sonner found a wormhole would be created. The implication is that gravity itself may come out of entanglement of these particles, and that the bending we see in the universe would also be due to the entanglement.
“It’s the most basic representation yet that we have where entanglement gives rise to some sort of geometry,” Sonner stated. “What happens if some of this entanglement is lost, and what happens to the geometry? There are many roads that can be pursued, and in that sense, this work can turn out to be very helpful.”
You can view the research in Physical Review Letters.