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

Autor: Shang-wu Ding, D. M. Wei, Xiaodong Yang, Maili Liu, Xianping Sun, Jun Luo, Xizhi Zeng
Rok vydání: 2003
Předmět:
Zdroj: Chinese Science Bulletin. 48:239-243
ISSN: 1861-9541
1001-6538
DOI: 10.1007/bf03183290
Popis: In this study, we report the experimental realization of seven-qubit Deutsch-Jozsa (D-J) algorithm and controlled phase-shift gates with improved precision using liquid state nuclear magnetic resonance (NMR). The experimental results have shown that transformations U-f in the seven-qubit D-J algorithm have been implemented with different pulse sequences, and whether f is constant or balanced is determined by using only a single function call (U-f). Furthermore, we propose an experimental method to measure 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 of surmounting the difficulties of low signal-to-noise ratio (SNR) in multi-qubit NMR quantum computers, more complicated experimental techniques, and the increase of gate errors due to using a large number of imperfect selective pulses. These are also applied to more complicated quantum algorithms with more qubits, such as quantum Fourier transformation and Shor's algorithm.
Databáze: OpenAIRE
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