8 October 2014 Imaging single photons in non-separable states of polarization and spatial-mode
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Non-separable superpositions of polarization and spatial mode of a single photon produce a state that has a polarization that depends on the transverse position, and contains all states of polarization represented on the Poincaré sphere. We have done measurements of the space-dependent state of polarization of single photons prepared in distinct 2×2 (qubit-qubit) and 2×3 (qubit-qutrit) non-separable superpositions of Laguerre-Gauss spatial and polarization states. Detection was done by polarimetry of the light projected at distinct locations in the transverse plane. The polarization patterns had a C-point polarization singularity (lemon, star or monstar) at the center of the transverse wavefunction.
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Xinru Cheng, Xinru Cheng, Enrique J. Galvez, Enrique J. Galvez, "Imaging single photons in non-separable states of polarization and spatial-mode", Proc. SPIE 9225, Quantum Communications and Quantum Imaging XII, 922506 (8 October 2014); doi: 10.1117/12.2061199; https://doi.org/10.1117/12.2061199

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