Abstract

Photonic N00N states, i.e., states of light where N photons are in an extremal superposition between two orthogonal states $\frac{1}{\sqrt{2}}\left(|N,0〉+|0,N〉\right)$, have an increased phase-sensitivity in comparison to their classical counterparts. Using the sensitivity offered by N00N states, in conjunction with the intrinsic properties of transverse-spatial modes, enables new measurement schemes with sensitivities beyond the classically allowed limits and opens up possibilities to investigate the behaviour of different quantum states.

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