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Implementation of a multiple round quantum dense coding using nuclear magnetic resonance

Science china({1.,Mechanics & Astronomy) 2005年第6期48卷 706-715页

作者： zhang jingfu1, xie jingyi2, wang chuan1, deng zhiwei3, lu zhiheng4. & long guilu1,5 1. key laboratory for quantum information and measurements of moe, department of physics, tsinghua university, beijing 100084.china 2. department of Materials Science and Engineering, beijing Normal university, beijing 100875, china 3. Testing and Analytical Center, beijing Normal university, beijing 100875,china 4. department of physics, beijing Normal university, beijing 100875, china 5. key laboratory For atomic and Molecular Nanosciences, tsinghua university, beijing 100084.china 1. key {1. For quantum information and measurements of moe Department of Physics Tsinghua University 100084 Beijing China 2. department of Materials science and Engineering Beijing Normal University 100875 Beijing China 3. Testing and Analytical Center Beijing Normal University 100875 Beijing China 4. department of physics Beijing Normal University 100875 Beijing China 5. key {1. For Atomic and Molecular Nanosciences Tsinghua University 100084 Beijing China

A multiple round quantum dense coding scheme based on the quantum phase estimation algorithm is proposed and implemented in a three qubit nuclear magnetic resonance (NMR) quantum computer. Using an m + 1.qubit system, Bob can transmit one of 2m+1.messages to Alice, through manipulating only one qubit and exchanging it between Alice and Bob for m rounds. The information capacity is enhanced to m + 1.bits as compared to m bits in a classical scheme. The scheme has been demonstrated in NMR system, and the experimental results show a good agreement between theory and experiment.

关键词： quantum dense coding, multiple round, nuclear magnetic resorance

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Dense coding scheme using superpositions of Bell-states and its NMR implementation

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Science china({1.,Mechanics & Astronomy) 2005年第1期48卷 57-67页

作者： zhang jingfu, xie jingyi, deng zhiwei & lu zhiheng key laboratory for quantum information and measurements, department of physics, tsinghua university, beijing 100084, china Center for quantum information, tsinghua university, beijing 100084, china department of Materials Science and Engineering, beijing Normal university, beijing 100875, china Testing and Analytical Center, beijing Normal university, beijing 100875, china department of physics, beijing Normal university, beijing 100875, china 1. key {1. for quantum information and measurements Department of Physics Tsinghua University 100084 Beijing China 2. Center for quantum {1. Tsinghua University 100084 Beijing China 3. department of Materials Science and Engineering Beijing Normal University 100875 Beijing China 4. Testing and Analytical Center Beijing Normal University 100875 Beijing China 5. department of physics Beijing Normal University 100875 Beijing China

Dense coding using superpositions of Bell-states is proposed. The generalized Grover's algorithm is used to prepare the initial entangled states, and the reverse process of the quantum algorithm is used to determine the entangled state in the decoding measurement. Compared with the previous schemes, the superpositions of two Bell-states are exploited. Our scheme is demonstrated using a nuclear magnetic resonance (NMR)quantum computer. The corresponding manipulations are obtained. Experimental results show a good agreement between theory and experiment. We also generalize the scheme to transmit eight messages by introducing an additional two-state system.

关键词： dense coding, superpositions of Bell-states, generalized Grover's algorithm, nuclear magnetic res-onance, quantum computer.

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