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      Experimental method for measuring classical negativity of generic beam shapes

      , , , , , ,
      Journal of Optics
      IOP Publishing

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          Is Open Access

          Spin-orbit interactions of light

          Light carries spin and orbital angular momentum. These dynamical properties are determined by the polarization and spatial degrees of freedom of light. Modern nano-optics, photonics, and plasmonics, tend to explore subwavelength scales and additional degrees of freedom of structured, i.e., spatially-inhomogeneous, optical fields. In such fields, spin and orbital properties become strongly coupled with each other. We overview the fundamental origins and important applications of the main spin-orbit interaction phenomena in optics. These include: spin-Hall effects in inhomogeneous media and at optical interfaces, spin-dependent effects in nonparaxial (focused or scattered) fields, spin-controlled shaping of light using anisotropic structured interfaces (metasurfaces), as well as robust spin-directional coupling via evanescent near fields. We show that spin-orbit interactions are inherent in all basic optical processes, and they play a crucial role at subwavelength scales and structures in modern optics.
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            Storage and retrieval of vector beams of light in a multiple-degree-of-freedom quantum memory

            The full structuration of light in the transverse plane, including intensity, phase and polarization, holds the promise of unprecedented capabilities for applications in classical optics as well as in quantum optics and information sciences. Harnessing special topologies can lead to enhanced focusing, data multiplexing or advanced sensing and metrology. Here we experimentally demonstrate the storage of such spatio-polarization-patterned beams into an optical memory. A set of vectorial vortex modes is generated via liquid crystal cell with topological charge in the optic axis distribution, and preservation of the phase and polarization singularities is demonstrated after retrieval, at the single-photon level. The realized multiple-degree-of-freedom memory can find applications in classical data processing but also in quantum network scenarios where structured states have been shown to provide promising attributes, such as rotational invariance.
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              Characterizing quantum channels with non-separable states of classical light

              Classical light is as good as quantum light to characterize a quantum channel. This unexpected result has practical consequences that make an experimentalist’s life easier in some situations.
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                Author and article information

                Journal
                Journal of Optics
                J. Opt.
                IOP Publishing
                2040-8978
                2040-8986
                May 01 2017
                May 01 2017
                April 19 2017
                : 19
                : 5
                : 055614
                Article
                10.1088/2040-8986/aa695a
                6874f99e-06bd-4817-80c5-04f104c6687d
                © 2017

                http://iopscience.iop.org/info/page/text-and-data-mining

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