Spatially encoded light for Large-alphabet Quantum Key Distribution
arXiv:1808.02823 · doi:10.1088/1367-2630/ab5cbe
Abstract
Most Quantum Key Distribution protocols use a two-dimensional basis such as HV polarization as first proposed by Bennett and Brassard in 1984. These protocols are consequently limited to a key generation density of 1 bit per photon. We increase this key density by encoding information in the transverse spatial displacement of the used photons. Employing this higher-dimensional Hilbert space together with modern single-photon-detecting cameras, we demonstrate a proof-of-principle large-alphabet Quantum Key Distribution experiment with 1024 symbols and a shared information between sender and receiver of 7 bit per photon.
arXiv comment9 pages, 6 figures, Added references, Updated Fig. 1 in the main text, Updated Fig.1 in supplementary material, Added section Trojan-horse attacks in supplementary material, title changed, Added paragraphs about final key rate and overfilling the detector to result section
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