Large-alphabet quantum key distribution using spatially encoded light
| Abstract | Most quantum key distribution protocols using a two-dimensional basis, such as HV polarization as first proposed by Bennett and Brassard in 1984, are 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. |
|---|---|
| URL | |
| Authors | T. B. H. Tentrup, W. M. Luiten, R. van der Meer, P. Hooijschuur, and P. W. H. Pinkse |
| Year of publication | 2019 |
| Date published | 12/2019 |
| Journal | New J. Phys. |
| Volume | 21 |
| Pages | 123044: 1-8 |
| DOI number | 10.1088/1367-2630/ab5cbe |
| Keywords | high-dimensional quantum optics, quantum key distribution, single-photon detection, spatial light encoding |