Free-space quantum key distribution with spatial modes of the optical field

Mark T. Gruneisen; Raymond C. Dymale; Kurt E. Stoltenberg

doi:10.1117/12.898926

13 October 2011 Free-space quantum key distribution with spatial modes of the optical field

Mark T. Gruneisen, Raymond C. Dymale, Kurt E. Stoltenberg

Proceedings Volume 8189, Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security; 81891B (2011) https://doi.org/10.1117/12.898926
Event: SPIE Security + Defence, 2011, Prague, Czech Republic

Abstract

The scalar attributes of the optical field are considered as an approach to enhancing bit rates in quantum key distribution over free-space optical links. The implications of spatial-mode encoding to system aperture requirements are considered for rectilinear and azimuthal bases of phase modulation. Diffractive-optics-based approaches to generating and discriminating photons based on spatial mode characteristics are quantified through analysis and experimentation. Spatial modes based on phase modulation are generated via modulo-2π phase modulation with a liquid-crystal spatial light modulator (LC SLM). The phase and amplitude modulation associated with superpositions of phase modulated fields are achieved via computer-generated holography with single LC SLM. Transmission volume holograms are evaluated as a technique for de-multiplexing phase modulated modes and cascaded volume holograms are considered as an approach to performing projective measurements on optical fields.

Citation Download Citation

Mark T. Gruneisen, Raymond C. Dymale, and Kurt E. Stoltenberg "Free-space quantum key distribution with spatial modes of the optical field", Proc. SPIE 8189, Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security, 81891B (13 October 2011); https://doi.org/10.1117/12.898926

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