Researchers at the Ludwig-Maximilian University of Munich (LMU Munich) in Germany have been testing the existence of quantum entanglement for several years, and scientists theorize these Bell tests could prove vital to the function of future quantum technologies.
For example, an in-development quantum system from Google employs entangled particles to conduct computing tasks. Quantum computers could run certain algorithms much faster because entangled particles can store and use exponentially more data than regular computer bits.
The difficulty of controlling entangled particles means engineers can use Bell tests to confirm entanglement. "It's an elementary test that can show that your quantum logic gate works," says LMU Munich's Harald Weinfurter.
The University of Toronto's Aephraim Steinberg also thinks Bell tests could contribute to data security, as they could be used to detect attempts to hack a cryptographic key encoded in entangled quantum particles, as well as identifying defects in the key itself.
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