Small sets of complementary observables
Markus Grassl, Daniel McNulty, Ladislav Mišta, Tomasz Paterek · Physical Review A · 2017
The eigenstates of complementary observables play an elementary role in quantum physics. Here the concept of unextendible sets of complementary observables is analyzed and a practical application in witnessing physical properties, such as the degree of purity of a state, is described.