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中国物理B：英文版

A realizable multi-bit dense coding scheme with an Einstein-Podolsky-Rosen channel

Qi Guo, 程留永, 王洪福, 张寿, Yeon, Kyu-Hwang

Published Jan 1, 2012• 0 citations
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Abstract

We propose a multi-bit dense coding scheme by using only an Einstein-Podolsky-Rosen(EPR) channel and assistant qubits.It is shown that no matter how many classical bits there are,the quantum channel is always a Bell state.The present dense coding process can also prepare non-local multi-particle Greenberger-Horne-Zeilinger(GHZ) states at one of the participants.The quantum circuits for this dense coding process are constructed,the deterministic implementation method in an optical system based on the cross-Kerr nonlinearities is shown.

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We propose a multi-bit dense coding scheme by using only an Einstein-Podolsky-Rosen(EPR) channel and assistant qubits.It is shown that no matter how many classical bits there are,the quantum channel is always a Bell state.The present dense coding process can also prepare non-local multi-particle Greenberger-Horne-Zeilinger(GHZ) states at one of the participants.The quantum circuits for this dense coding process are constructed,the deterministic implementation method in an optical system based on the cross-Kerr nonlinearities is shown.
We propose a multi-bit dense coding scheme by using only an Einstein—Podolsky—Rosen (EPR) channel and assistant qubits. It is shown that no matter how many classical bits there are, the quantum channel is always a Bell state. The present dense coding process can also prepare non-local multi-particle Greenberger—Horne—Zeilinger (GHZ) states at one of the participants. The quantum circuits for this dense coding process are constructed, the deterministic implementation method in an optical system based on the cross-Kerr nonlinearities is shown.
A novel scheme for realizing dense coding with Greenberger-Home-Zeilinger(GHZ) state in linear optical system is proposed.In this protocol,Alice codes on photon 1 and 2 by linear optical element and sents these photons to Bob.Then Bob performs a joint measurement on photons 1,2,and 3 with the GHZ basis by employing two quantum nondemolition detectors(QND) and polarizing beam splitter(PBS).Eight GHZ states can be completely discriminated.According to the outcomes of his measurement,Bob can determine what operation Alice applied.Alice only transmits two photons in this process of the quantum dense coding,but Bob can obtain three bits of classical information.The QND devices are generally based on cross-Kerr nonlinearities,and the cross-Kerr nonlinearities are available with electromagnetically induced transparency(EIT).
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.