Photonic Angular Superresolution Using Twisted N00N States

Phys Rev Lett. 2021 Dec 24;127(26):263601. doi: 10.1103/PhysRevLett.127.263601.

Abstract

The increased phase sensitivity of N00N states has been used in many experiments, often involving photon paths or polarization. Here we experimentally combine the phase sensitivity of N00N states with the orbital angular momentum (OAM) of photons up to 100 ℏ, to resolve rotations of a light field around its optical axis. The results show that both a higher photon number and larger OAM increase the resolution and achievable sensitivity. The presented method opens a viable path to unconditional angular supersensitivity and accessible generation of N00N states between any transverse light fields.