"Spectral implementation" for creating a labeled pseudo-pure state and the Bernstein-Vazirani algorithm in a four-qubit nuclear magnetic resonance quantum processor.
A quantum circuit is introduced to describe the preparation of a labeled pseudo-pure state by multiplet-component excitation scheme which has been experimentally implemented on a 4-qubit nuclear magnetic resonance quantum processor. Meanwhile, we theoretically analyze and numerically investigate the low-power selective single-pulse implementation of a controlled-rotation gate, which manifests its validity in our experiment. Based on the labeled pseudo-pure state prepared, a 3-qubit Bernstein-Vazirani algorithm has been experimentally demonstrated by spectral implementation. The "answers" of the computations are identified from the split peak positions in the spectra of the observer spin, which are equivalent to projective measurements required by the algorithms.
Laboratory of Magnetic Resonance and Molecular Physics, Wuhan Institute of Physics and Mathematics, the Chinese Academy of Sciences, 430071, People's Republic of China. xhpeng@wipm.ac.cn
Xinhua
X
Peng
Xiwen
X
Zhu
Ximing
X
Fang
Mang
M
Feng
Maili
M
Liu
Kelin
K
Gao