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Experimental Procedure to Characterize the Effects of Filtering and Decoherence on Polarization Entangled Photons

Daniel E. Jones, Brian T. Kirby, Gabriele Riccardi, Cristian Antonelli, Michael Brodsky

Published Oct 1, 2020• 1 citation
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Invariant entangled states remain unchanged under simultaneous identical unitary transformations of all their subsystems. We experimentally generate and characterize such invariant two-, four-, and six-photon polarization entangled states. This is done only with a suitable filtering procedure of multiple emissions of entangled photon pairs from a single source without any interferometric overlaps. We get the desired states utilizing bosonic emission enhancement due to indistinguishability. The setup is very stable and gives high interference contrasts. Thus, the process is a very likely candidate for various photonic demonstrations of quantum information protocols.