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Phys Rev Lett. 2002 Jan 28;88(4):047904. Epub 2002 Jan 11.

Quantum dense coding exploiting a bright Einstein-Podolsky-Rosen beam.

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State Key Laboratory of Quantum Optics and Quantum Optics Devices, Taiyuan, China.


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.

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