title: Experimental realization of equiangular three-state quantum key distribution.
abstract: Quantum key distribution using three states in equiangular configuration combines a security threshold comparable with the one of the Bennett-Brassard 1984 protocol and a quantum bit error rate (QBER) estimation that does not need to reveal part of the key. We implement an entanglement-based version of the Renes 2004 protocol, using only passive optic elements in a linear scheme for the positive-operator valued measure (POVM), generating an asymptotic secure key rate of more than 10 kbit/s, with a mean QBER of 1.6%. We then demonstrate its security in the case of finite key and evaluate the key rate for both collective and general attacks.
authors.affiliation: Dipartimento di Ingegneria dell'Informazione, Università di Padova, via Venezia 15, 35131 Padova, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Schiavon
authors.affiliation: Dipartimento di Ingegneria dell'Informazione, Università di Padova, via Venezia 15, 35131 Padova, Italy.|Istituto di Fotonica e Nanotecnologie, CNR, Padova, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Vallone
authors.affiliation: Dipartimento di Ingegneria dell'Informazione, Università di Padova, via Venezia 15, 35131 Padova, Italy.|Istituto di Fotonica e Nanotecnologie, CNR, Padova, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Villoresi