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.
Highlights
During the past few decades, N00N states have been the focus of several studies where their potential was explored in different metrological applications [1,2,3,4]
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 increased phase sensitivity means that a phase φ affects the Fock state jNi N times, changing the state to eiNφjNi, whereas classical states of light would only gain the phase φ [3]
Summary
During the past few decades, N00N states have been the focus of several studies where their potential was explored in different metrological applications [1,2,3,4]. 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.
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