Robust quantum state transfer inspired by Dzyaloshinskii-Moriya interactions
Robust quantum state transfer inspired by Dzyaloshinskii-Moriya interactions
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受 Dzyaloshinskii-Moriya 相互作用启发的鲁棒量子态转移
DOI：
10.1103/physreva.95.052332
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发表时间：
2017-05
影响因子：
2.9
通讯作者：
Zhao H Q
中科院分区：
文献类型：
--
作者：
Shi X;Yuan H;Mao X;Ma Y;Zhao H Q
量子态转移（QST）是量子力学中的一个基本问题，在量子信息处理中具有重要意义。在本文中，我们探索了一种快速，鲁棒，高效的量子点量子ST自旋。不同于通常的方法，仅使用交换相互作用来控制自旋系统的演化，在这里，我们将不可忽略的Dzyaloshinskiii-Moriya（DM）相互作用，可以在量子点中进行电和热控制，作为加速布居转移的辅助驱动。我们证明了DM相互作用不是一个误差源，但在一定条件下对布居演化是有益的，因为它们可以充分消除绝热通道之间的不希望的量子跃迁，并严格保持在一个设计的通道中的布居演化的高效率。我们给出了一个通用的$N$-自旋各向异性海森堡自旋模型来描述粒子数的演化，并以具体的两自旋和三自旋系统为例来说明DM相互作用对QST的优势.
Quantum state transfer (QST) is a fundamental problem in quantum mechanics and is important for quantum information processing. In this paper we explore a fast, robust, and efficient QST in spin-based quantum dots. Differing from the usual method that only uses the exchange interactions to control the evolution of the spin system, here we treat the non-negligible Dzyaloshinskii-Moriya (DM) interactions that can be electrically and thermally controlled in quantum dots as an assisted driving to accelerate the population transfer. We demonstrate that the DM interactions are not an error source, but are beneficial for population evolution under certain condition because they can sufficiently eliminate the undesirable quantum transitions among adiabatic passages and strictly maintain the population evolution in a designed passage with high efficiency. We give a generic $N$-spin anisotropic Heisenberg spin model to describe the population evolution and take specific two- and three-spin systems as examples to demonstrate the advantages of the DM interactions for QST.