In the most massive test to date, physicists have probed a major paradox in quantum mechanics and found it still holds even for clouds of hundreds of atoms.
The researchers say this has important implications for quantum metrology – the study of measuring things under quantum theory.
Although we're pretty good at mathematically describing the Universe, our understanding of how things work is patchy at best. But quantum mechanics isn't without its flaws, and in 1935, three famous physicists found a significant hole. Albert Einstein, Boris Podolsky, and Nathan Rosen described the famous Einstein-Podolsky-Rosen paradox., what Einstein referred to as"spooky action at a distance". This is where you correlate two particles so that their properties are linked; if one particle, for example, spins one way, the other spins the other way.
The EPR paradox, therefore, is complex. When you measure one particle in an entangled system, that measurement somehow influences the other particle, even though the measurement isn't taking place locally.
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