Measuring the orbital angular momentum of a single photon.

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Photon Orbital Angular Momentum in Astrophysics (2003, methodology): “By providing additional information about the quantum number m, the cascade of Leach et al. (2002) would then appear to endow the radiation with more degrees of freedom than the partition function permits, in apparent violation of Bose-Einstein statistics and the Heisenberg uncertainty principle.”
A quantum memory for orbital angular momentum photonic qubits (2013, background): “Recent years have also seen a tremendous interest in exploiting orbital angular momentum at the single-photon level in quantum information technologies [6, 7].”
Measurement of the spin of the M87 black hole from its observed twisted light (2019, background): “The translational (linear momentum) as well as the rotational (angular momentum) properties of the EM field remain valid down to the single photon level [18, 19], a fact that is further substantiated in the Majorana photon wavefunction formalism [17, 20] with its complete equivalence to quantum elec”
Theory and applications of free-electron vortex states (2017, background): “quantum information and communications [34, 35, 36, 37, 38], quantum entanglement [39, 40], radio com-”