Experimental quantum key distribution based on a Bell test
Alexander Ling, Matthew P. Peloso, I. Marcikic, Valerio Scarani, Antı́a Lamas-Linares, Christian Kurtsiefer · Physical Review A · 2008
We report on a complete free-space field implementation of a modified Ekert protocol for quantum key distribution using entangled photon pairs. For each photon pair we perform a random choice between key generation and a Bell inequality. The amount of violation is used to determine the possible knowledge of an eavesdropper to ensure security of the distributed final key.