Indistinguishability of identical photons and its application in quantum metrology

KNOLL, L. T.; BOSYK, G M; LÓPEZ GRANDE, I. H.; LAROTONDA, M. A.

CABA

Otro; XXI Giambiagi Winter School: Quantum simulations and quantum metrology with cold trapped ions; 2019

Departamento de Fisica - FCEyN - UBA

We report a theoretical and experimental study on the role ofindistinguishability in the estimation of an interferometric phase.In particular, we show that the quantum Fisher Information,which is a witness of the quality of the phase estimation,increases linearly with respect to the degree ofindistinguishability between the input photons in a two-portinterferometer.We designed a setup to experimentally measure this result forthe case of two photons entering a polarization-basedinterferometer, where the degree of indistinguishability ischaracterized by the overlap between two spatial modes.Preliminary results are reported, as measurements are still beingperformed.