Through experimentation, a group of physicists at the University of Basel in Switzerland have discovered that the Einstein-Podolsky-Rosen paradox persists when scaled up. In 1935, Albert Einstein, Boris Podolsky, and Nathan Rosen published a paper outlining a thought experiment that suggested that quantum mechanics did not provide a complete description of reality. Paolo Colciaghi, Yifan Li, Philipp Treutlein, and Tilman Zibold describe their experiment in Physical Review X. They argued that quantum theory did not contain “elements of reality,” and they went further by speculating that a new theory could be developed that would include such hidden variables.
Since then, their experiment has come to be known as the EPR paradox due to the contradictions it reveals. For example, one particle in a system can influence other particles due to entanglement, and it is possible to learn more about a system’s particles than the Heisenberg uncertainty principle should allow.
Quite a while later, John Chime created what has come to be referred to as the Ringer test for testing the EPR conundrum; up to this point, it has involved little-caught frameworks utilizing sets of photons, or iotas. The team has demonstrated in this new endeavor that Bose-Einstein condensates can be used to extend the same experiment to a larger system.
In their examination, the gathering started by producing a cloud comprised of rubidium-87 iotas. They then, at that point, created a collaboration between the molecules in the cloud, driving them to turn into an entrapped Bose-Einstein condensate. They then delivered the condensate into two separate mists, where the pseudospins were ensnared. They finished up by estimating the “pseudospins” of the two mists —each of which held many rubidium-87 iotas — autonomously. The EPR paradox holds even when scaled up because they discovered that the properties of the two clouds could not be correlated in a way that could be attributed to chance.
The research team suggests that the experiment could be used as a model for other applications of quantum metrology in addition to their findings.
More information: Paolo Colciaghi et al, Einstein-Podolsky-Rosen Experiment with Two Bose-Einstein Condensates, Physical Review X (2023). DOI: 10.1103/PhysRevX.13.021031
