title: Quantum dense coding exploiting a bright Einstein-Podolsky-Rosen beam.
abstract: Highly efficient quantum dense coding for continuous variables has been experimentally accomplished by means of exploiting a bright Einstein-Podolsky-Rosen (EPR) beam with anticorrelation of amplitude quadratures and correlation of phase quadratures. Two bits of classical information are encoded on two quadratures of a half of a bright EPR beam, then are simultaneously decoded by the other half of the EPR beam with the sensitivities beyond that of the shot noise limit. A high degree of immunity to unauthorized eavesdropping has been experimentally demonstrated.
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Taiyuan, China.
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Li
authors.forename: Qing
authors.initials: Q
authors.lastname: Pan
authors.forename: Jietai
authors.initials: J
authors.lastname: Jing
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Changde
authors.initials: C
authors.lastname: Xie
authors.forename: Kunchi
authors.initials: K
authors.lastname: Peng