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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.23: Poster

Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof

Ghost Polarization Communication — •Markus Rosskopf, Till Mohr, and Wolfgang Elsäßer — Institute of Applied Physics, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany

The polarization state of polarized light is typically quantified by a Stokes vector on the Poincaré sphere. Completely unpolarized light can be understood as a rapidly altering Stokes vector, with an instantaneous polarization state, that can be characterized by a polarization time which is in the femtosecond regime and can be measured by a photomultiplier detecting two-photon absorption.

Recently, ghost imaging has been extended to new ghost modality domains, in particular ghost spectroscopy and ghost polarimetry (GP) by exploiting correlations in the spectral and polarization domain, respectively. In GP, a hidden polarization state has been successfully recovered by exploiting polarization correlations.

Here, we demonstrate a novel communication scheme between two parties by encoding and camouflaging information in the instantaneous polarization state of unpolarized light emitted by an erbium-doped fiber amplifier. The 2nd order intensity correlation is measured using two-photon absorption interferometry and used to retrieve the transmitted polarization state and thus the message.

The correlation measurements for unpolarized light in our ghost polarization communication setup can be seen in analogy to classical intensity measurements of polarized light using Stokes parameter analysis, thus also offering new insight into the nature of unpolarized light.