ETH Zurich researchers have succeeded in demonstrating that quantum mechanical objects that are far apart can be much more strongly correlated with each other than is possible in conventional systems. For this experiment, they used superconducting circuits for the first time. ETH Zurich researc
ETH Zurich researchers performed a loophole-free Bell test with superconducting circuits, confirming quantum mechanics and disproving Einstein’s local causality concept. The findings open up possibilities in distributed quantum computing and quantum cryptography.
A group of researchers led by Andreas Wallraff, Professor of Solid State Physics at ETH Zurich, has performed a loophole-free Bell test to disprove the concept of “local causality” formulated by Albert Einstein in response to quantum mechanics. By showing that quantum mechanical objects that are far apart can be much more strongly correlated with each other than is possible in conventional systems, the researchers have provided further confirmation for quantum mechanics.
Over time, however, more and more of these loopholes could be closed. Finally, in 2015, various groups succeeded in conducting the first truly loophole-free Bell tests, thus finally settling the old dispute. The core team from the Quantum Device Laboratory at ETH Zurich who performed the experiment. From left to right: Anatoly Kulikov, Simon Storz, Andreas Wallraff, Josua Schär, Janis Lütolf. Credit: ETH Zurich / Daniel WinklerHowever, the researchers need a sophisticated test facility for this. Because for the Bell test to be truly loophole-free, they must ensure that no information can be exchanged between the two entangled circuits before the quantum measurements are complete.
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