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Cosmic Bell test probes the reality of quantum mechanics

In this interview, Johannes Handsteiner describes an experiment to test the foundations of quantum mechanics. Handsteiner was part of a team at the Institute for Quantum Optics and Quantum Information (IQOQI) in Vienna, Austria, that designed a Bell test experiment using light from now-ancient quasars. Handsteiner explains why his team went to such lengths to close an important loophole in this famous test designed to rule out the possibility of a classical explanation.

The interview was recorded in 2019 before the COVID-19 pandemic. Handsteiner now works at Quantum Technology Laboratories, a company involved in contract research in the field of Quantum Key Distribution (QKD).

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