NMR experimental realization of seven-qubit D-J algorithm and controlled phase-shift gates with improved precision

查看全文 作　　者：[1]WEIDaxiu;[2]LUOJun;等

机构地区：[1]StateKeyLaboratoryofMagneticResonanceandAtomicandMolecularPhysics,WuhanInstituteofPhysicsandMathematics,ChineseAcademyofSciences,Wuhan430071,China;[2]StateKeyLaboratoryofMagneticResonanceandAtomicandMole

出　　处：《Chinese Science Bulletin》索引2003年第48卷第3期,共5页

基　　金：supported by the National Natural Science Foundation of China(Grant No.19874073);the National Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KJCX2-W1) 摘　　要：In this study, we report the experimental reali-zation of seven-qubit Deutsch-Jozsa (D-J) algorithm and controlled phase-shift gates with improved precision using liquid state nuclear magnetic resonance (NMR). Theexperimental results have shown that transformations Uf in the seven-qubit D-J algorithm have been implemented with different pulse sequences, and whether f is constant orbalanced is determined by using only a single function call(Uf). Furthermore, we propose an experimental method tomeasure and correct the error in the controlled phase-shift gate that is simple and feasible in experiments, and can have precise phase shifts. These may offer the possibility ofsurmounting the difficulties of low signal-to-noise ratio(SNR) in multi-qubit NMR quantum computers, morecomplicated experimental techniques, and the increase ofgate errors due to using a large number of imperfect selec-tive pulses. These are also applied to more complicated quantum algorithms with more qubits, such as quantumFourier transformation and Shor抯 algorithm. 关键词：D-J量子算法 NMR实验计算精度 QUBIT 七昆比特受控相移门电路误差测量多昆比特NMR量子计算

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NMR experimental realization of seven-qubit D-J algorithm and controlled phase-shift gates with improved precision

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