Quantum discord determines the interferometric power of quantum states - Girolami, Davide; Souza, Alexandre M.; Giovannetti, Vittorio; Tufarelli, Tommaso; Filgueiras, Jefferson G.; Sarthour, Roberto S.; Pinto, Diogo de Oliveira Soares; Oliveira, Ivan S.; Adesso, Gerardo (Physical Review Letters, 2014)