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Highly efficient quantum dense coding for continuous variables has beenexperimentally accomplished by means of exploiting bright EPR beam withanticorrelation of amplitude quadratures and correlation of phase quadratures,which is generated from a nondegenerate optical parametric amplifier operatingin the state of deamplification. Two bits of classical information are encodedon two quadratures of a half of bright EPR beam at the sender Alice andtransmitted to the receiver Bob via one qubit of the shared quantum state afterencoding. The amplitude and phase signals are simultaneously decoded with theother half of EPR beam by the direct measurement of the Bell-state at Bob. Thesignal to noise ratios of the simultaneously measured amplitude and phasesignals are improved 5.4dB and 4.8dB with respect to that of the shot noiselimit respectively. A high degree of immunity to unauthorized eavesdropping ofthe presented quantum communication scheme is experimentally demonstrated.Comment: 11 pages, 5 figure

Quantum Dense Coding Exploiting a Bright Einstein-Podolsky-Rosen Beam