Jeff Steinhauer, Technion – Israel Institute of Technology, has observed a thermal distribution of Hawking radiation, stimulated by quantum vacuum fluctuations, emanating from an analogue black hole. This confirms Hawking’s prediction regarding black hole thermodynamics. The thermal distribution is accompanied by correlations between the Hawking particles outside the black hole and the partner particles inside. We find that the high energy pairs of Hawking and partner particles are entangled, while the low energy pairs are not. This has implications for the problem of information loss in a black hole. The observation of Hawking radiation reported here verifies Hawking’s calculation, which is viewed as a milestone in the quest for quantum gravity.
The experiment consisted of creating an entangled pair of phonons sitting inside a bit of liquid that had been forced (via laser) to move very fast and then observing the action as one of the pair was pulled away as the liquid began to move faster than the speed of sound, while the other escaped—the fluid was a Bose-Enistein condensate of rubidium-87 atoms. After repeating the experiment 4,600 times Steinhauer became convinced that the particles were entangled, a necessity for a Hawking radiation analogue. His findings do not prove Hawking’s theory to be true, of course, but they do appear to add a degree of credence that other researchers have thus far not been able to achieve.
SOURCES- Arxiv, Nature Physics, Youtube, University of Waterloo, Phys.org