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Einstein's "spooky action at a distance" can connect more than two systems, new research suggests

An international group of researchers, including researchers from Australia, has found proof that Einstein called “spooky action at a distance” might possibly relate to more than two optical systems. The finding, which already has been issued in Nature Physics, covers the way for the study of quantum properties in bigger quantum networks than we’d previously considered. The study centers on the 1935 Einstein-Podolsky-Rosen (EPR) paradox - you know the one that also comprised Einstein not trusting in quantum entanglement. This is for the reason that quantum entanglement states that two particles can be indirectly connected and can apparently affect each other no matter how far apart they are. Einstein was concerned, because this appeared to propose that information can move quicker than the speed of light. So this time Einstein was mistaken and we now know that quantum entanglement occurs, and forms the foundation of teleportation and quantum cryptography. Just last year, for instance, scientists from the University of Geneva achieved to teleport a photon across a distance 25 kilometers.

But, up to now, the capability of one system to instantly affect the other, which is identified as EPR steering entanglement, had only been examined among two systems. Seiji Armstrong, currently working at the Quantum Computing Centre Node at the Australian National University, said in a press release “We used an optical network to experimentally confirm how this spooky type of entanglement can be shared over not just two, but three or more distinct optical systems,” In the test, the group used three powerful optical rays and presented that they could affect the sites and momenta of each other over a distance. 

Significantly, the research was set up with a slight postulation about the nature of the tools used to measure all but one of the fields. 

Mesoscopic comes under the discipline of physics that works with matter in between micro and macroscopic. This finding is thrilling, because quantum entanglement forms the foundation of quantum cryptography - which targets to produce “unhackable” passwords that are only reachable if someone has access to an entangled system.  The scientists consider that their methods will now help to produce more safe systems for iPhones and computers. Check out Veritasium's awesome description of quantum entanglement. It'll help, trust me.

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