Dr. Eric R. Eliel Profile

Dr. Eric R. Eliel

at Leiden Univ

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Proceedings Article | 11 February 2012 Paper

Fiber transport of spatially entangled photons

W. Löffler, E. Eliel, J. Woerdman, T. Euser, M. Scharrer, P. Russell

Proceedings Volume 8274, 82740F (2012) https://doi.org/10.1117/12.905418

KEYWORDS: Photons, Dispersion, Superposition, Sensors, Multimode fibers, Polarization, Photonic crystal fibers, Quantum communications, Quantum information, Optical filters

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High-dimensional entangled photons pairs are interesting for quantum information and cryptography: Compared to the well-known 2D polarization case, the stronger non-local quantum correlations could improve noise resistance or security, and the larger amount of information per photon increases the available bandwidth. One implementation is to use entanglement in the spatial degree of freedom of twin photons created by spontaneous parametric down-conversion, which is equivalent to orbital angular momentum entanglement, this has been proven to be an excellent model system. The use of optical fiber technology for distribution of such photons has only very recently been practically demonstrated and is of fundamental and applied interest. It poses a big challenge compared to the established time and frequency domain methods: For spatially entangled photons, fiber transport requires the use of multimode fibers, and mode coupling and intermodal dispersion therein must be minimized not to destroy the spatial quantum correlations. We demonstrate that these shortcomings of conventional multimode fibers can be overcome by using a hollow-core photonic crystal fiber, which follows the paradigm to mimic free-space transport as good as possible, and are able to confirm entanglement of the fiber-transported photons. Fiber transport of spatially entangled photons is largely unexplored yet, therefore we discuss the main complications, the interplay of intermodal dispersion and mode mixing, the influence of external stress and core deformations, and consider the pros and cons of various fiber types.

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