University of Gda Team Identifies Permutation Asymmetry for Detecting Measurement Correlations

Scientists at the University of Gdańsk, in collaboration with the HUN-REN Institute, have demonstrated that maximally entangled two-qubit states, while initially exhibiting equivalent behaviour in certain contexts, can differ significantly in randomised Bell tests depending on their permutation symmetry. This research reveals that asymmetric states can substantially increase the probability of observing nonlocality in Bell tests performed with a limited number of measurement settings, offering a refined methodology for strengthening demonstrations of quantum mechanics and potentially detecting subtle correlations between measurement choices. The findings underscore the previously underappreciated…