中文摘要：

利用一种优化的幺正算符制备了一种高度纠缠态——cluster态,这个优化的幺正算符因为只需要施加非选择性脉冲,其所用的时间被明显缩短.该文选择一个三量子位的自旋体系,在核磁共振仪器上进行了实验验证,实验过程中先制备了一个三量子位的纯态,然后通过施加优化的幺正算符即可得到三量子位的cluster态,实验结果证明了优化幺正算符的有效性.

英文摘要：

This paper exploits one optimized unitary operator to prepare a type of highly entangled state of multiple qubits---cluster state. Based on optimal control theory, the duration of optimized unitary operator has been shortened due to the application of a series of non-selective pulse. We experimentally implemented the optimized unitary operator on a NMR spectrometer. By firstly generating a pseudo-pure state, a three-qubit cluster state was produced by applying the optimized unitary operator. Our experimental results show the feasibility of the optimized unitary operator.