8-12 July 2013
Encoding mutually unbiased bases in orbital angular momentum for quantum key distribution
Presented by Dr. Angela DUDLEY on 9 Jul 2013 from 17:40 to 18:40
Type: Poster Presentation
Track: Track C - Photonics
We encode mutually unbiased bases (MUBs) using the higher-dimensional orbital angular momentum (OAM) degree of freedom associated with optical fields. We illustrate how these states are encoded with the use of a spatial light modulator (SLM). We demonstrate how (d+1)-mutually unbiased measurements can be made in both a classical prepare and measure scheme and on a pair of entangled photons. In the entanglement-based scheme we perform mutual unbiased measurements for dimensions ranging from d = 2 to 5. The calculation of the average error rate, mutual information and secret key rate show an increase in information capacity as well as higher generation rates as the dimension increases.
Prof. Andrew Forbes, AForbes1@csir.co.za, CSIR National Laser Centre