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arXiv 2006.02236cond-mat.mes-hallphysics.app-ph
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自旋霍尔伊辛机

A Spin Hall Ising Machine

Afshin Houshang, Mohammad Zahedinejad, Shreyas Muralidhar, Jakub Checinski, Ahmad A. Awad, Johan Åkerman

摘要:

伊辛机(Ising Machines,IM)是一种物理系统,通过其二进制自旋的耦合强度来找到映射到IM上的组合优化(CO)问题的解决方案。使用内在动力学和不同的退火方案,IM随着时间的推移松弛到其最低能量状态,这是CO问题的解决方案。IM已经在量子、光学和电子硬件中实现。一种有前途的方法使用相互作用的非线性振荡器,其相位已经通过注入锁定在其固有频率的两倍处被二进制化。在这里,我们展示了这样的振荡器IM使用纳米收缩自旋霍尔纳米振荡器(SHNO)阵列。我们展示了如何SHNO阵列可以很容易地相位二进制化,以及由此产生的微波功率对应于定义良好的全球相位状态。为了区分简并态,我们使用相位分辨布里渊光散射(BLS)显微镜直接观察每个纳米收缩的各个相位。

英文摘要:

Ising Machines (IMs) are physical systems designed to find solutions to combinatorial optimization (CO) problems mapped onto the IM via the coupling strengths of its binary spins. Using the intrinsic dynamics and different annealing schemes, the IM relaxes over time to its lowest energy state, which is the solution to the CO problem. IMs have been implemented in quantum, optical, and electronic hardware. One promising approach uses interacting nonlinear oscillators whose phases have been binarized through injection locking at twice their natural frequency. Here we demonstrate such Oscillator IMs using nano-constriction spin Hall nano-oscillator (SHNO) arrays. We show how the SHNO arrays can be readily phase binarized and how the resulting microwave power corresponds to well-defined global phase states. To distinguish between degenerate states we use phase-resolved Brillouin Light Scattering (BLS) microscopy to directly observe the individual phase of each nano-constriction.

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