arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2602.13593cond-mat.mes-hallphysics.app-ph
收藏

约瑟夫森-like磁隧道结 -- 从经典到量子 regime 的过渡

Josephson-like magnetic tunnel junction -- transition from classical to quantum regime

Moscow Center for Advanced Studies(莫斯科高等研究中心);New Spintronic Technologies(新自旋电子技术公司);Prokhorov General Physics Institute of the Russian Academy of Sciences(俄罗斯科学院普罗霍罗夫普通物理研究所)

V. V. Yurlov, P. N. Skirdkov, K. A. Zvezdin, A. K. Zvezdin

AI总结:

该研究提出了一种具有量子自旋动力学的约瑟夫森-like磁隧道结结构,通过理论框架实现自旋电子量子比特,并展示了如何利用自旋电流控制量子比特状态。

摘要:

我们理论地提出并分析了一种具有量子自旋动力学的约瑟夫森-like磁隧道结(MTJ)结构,其动力学类似于超导约瑟夫森结。通过利用低损耗MTJ在易平面各向异性下的运动方程与约瑟夫森相动力学之间的同构性,我们构建了一个实现自旋电子量子比特的理论框架。在该框架中,我们识别出决定从经典到量子行为过渡的物理参数,如各向异性常数、吉尔伯特阻尼、自旋电流幅度和几何因子。我们展示了根据能量尺度的层次,可以实现不同类型的自旋电子量子比特,包括电荷、磁通量和transmon超导量子比特的类比。为每个 regime 开发了哈密顿量形式化,使能够对双态量子动力学进行解析处理并估计相干时间。特别是,我们证明自旋电流不仅可以用来激发,还可以通过耗散控制来稳定量子比特状态。这些发现为将自旋电子量子比特整合到CMOS兼容架构中提供了一条道路,并为完全自旋电子量子计算平台奠定了基础。

英文摘要:

We theoretically propose and analyze a Josephson-like magnetic tunnel junction (MTJ) structure that exhibits quantum spin dynamics analogous to those in superconducting Josephson junctions. By exploiting the isomorphism between the equations of motion for low-dissipation MTJs with easy-plane anisotropy and the Josephson phase dynamics, we construct a theoretical framework for realizing spintronic qubits. Within this framework, we identify the physical parameters -- such as anisotropy constants, Gilbert damping, spin current amplitude, and geometric factors -- that govern the transition from classical to quantum behavior. We show that different types of spintronic qubits, including analogs of charge, flux, and transmon superconducting qubits, can be implemented depending on the hierarchy of energy scales. A Hamiltonian formalism is developed for each regime, enabling an analytical treatment of the two-level quantum dynamics and estimation of coherence times. In particular, we demonstrate that the spin current can be used not only to excite but also to stabilize the qubit states through dissipation control. These findings provide a route toward integrating spintronic qubits into CMOS-compatible architectures and lay the groundwork for a fully spintronic platform for quantum computation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑