Quantum computation in semiconductor quantum dots of electron-spin asymmetric anisotropic exchange
Quantum computation in semiconductor quantum dots of electron-spin asymmetric anisotropic exchange
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DOI：
10.1103/physreva.76.044306
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发表时间：
2007-10
影响因子：
2.9
通讯作者：
X. Hao;Shiqun Zhu
中科院分区：
文献类型：
--
作者：
X. Hao;Shiqun Zhu
当耦合半导体量子点中的电子自旋之间存在非对称各向异性交换时，可以得到普适的量子计算。通过控制两个局域幺正旋转，可以将非对称海森堡模型转化为各向同性模型，从而实现量子门。每个量子比特上的旋转是对称的，并且取决于非对称交换的强度和方向。在各向异性耦合量子点中实现轴对称局域磁场可以辅助量子逻辑门的构建。该方案可以有效地利用每个物理电子自旋作为通用量子计算中的逻辑量子比特。
The universal quantum computation is obtained when there exists asymmetric anisotropic exchange between electron spins in coupled semiconductor quantum dots. The asymmetric Heisenberg model can be transformed into the isotropic model through the control of two local unitary rotations for the realization of essential quantum gates. The rotations on each qubit are symmetrical and depend on the strength and orientation of asymmetric exchange. The implementation of the axially symmetric local magnetic fields can assist the construction of quantum logic gates in anisotropic coupled quantum dots. This proposal can efficiently use each physical electron spin as a logical qubit in the universal quantum computation.