Solid-state optimal phase-covariant quantum cloning machine
Solid-state optimal phase-covariant quantum cloning machine
复制标题
固态最优相位协变量子克隆机
DOI：
10.1063/1.3624595
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发表时间：
2011-08-01
影响因子：
4
通讯作者：
Fan, Heng
中科院分区：
文献类型：
--
作者：
Pan, Xin-Yu;Liu, Gang-Qin;Fan, Heng
本文报道了在室温固态系统中实现单电子自旋的最优相位协变量子克隆机。两个逻辑量子比特的三个态被物理编码在一个单电子自旋的三个能级中，在金刚石的氮空位缺陷中心有两个塞曼子能级。输入态的制备和相位协变量子克隆变换由两个独立的微波场控制。平均实验保真度达到85.2%，非常接近理论最佳保真度85.4%，超过了通用克隆的界限83.3%。
Here, we report an experimental realization of optimal phase-covariant quantum cloning machine with a single electron spin in solid state system at room temperature. The involved three states of two logic qubits are encoded physically in three levels of a single electron spin with two Zeeman sub-levels at a nitrogen-vacancy defect center in diamond. The preparation of input state and the phase-covariant quantum cloning transformation is controlled by two independent microwave fields. The average experimental fidelity reaches 85.2% which is very close to theoretical optimal fidelity 85.4% and is beyond the bound 83.3% of universal cloning.