TY - RPRT TI - Quantum key distribution with higher-order alphabets using spatially encoded qudits. AU - S P Walborn AU - D S Lemelle AU - M P Almeida AU - P H Souto Ribeiro PY - 2006 DO - 10.1103/physrevlett.96.090501 UR - https://pubmed.ncbi.nlm.nih.gov/16606248/ ID - 16606248 ER -