Indian researchers report that preparing a pair of qubits in opposite (antiparallel) spins enables information extraction that two identical copies cannot. Specifically, the team shows they can predict three mutually incompatible spin components simultaneously—contrary to what complementarity and Heisenberg-type restrictions typically suggest. The finding, highlighted through work reported in Physical Review Letters, points to new strategies for characterizing quantum devices with fewer resources and for rethinking quantum cryptography protocols.
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