Implementing a magnonic time-delay reservoir computer model
Implementing a magnonic time-delay reservoir computer model
复制标题
DOI：
10.1103/physrevapplied.15.064060
复制
发表时间：
2021-04
期刊：
影响因子：
--
通讯作者：
S. Watt;M. Kostylev;A. Ustinov;B. Kalinikos
中科院分区：
文献类型：
--
作者：
S. Watt;M. Kostylev;A. Ustinov;B. Kalinikos
最近，我们在实验上证明，基于自旋行波提供的时间延迟反馈的微波振荡器可以作为水库计算机运行。在本文中，我们扩展了这一概念，通过增加的功能，时间复用的大传播时间/距离的自旋波。该系统利用钇铁石榴石薄膜中传播的静磁表面自旋波的非线性行为和有源环结构中固有的时间延迟来处理时间相关的数据流。通过时间复用方法获得更高的储层维度，将“虚拟“神经元仿真为在自振荡阈值以下的活动环中循环的时间上分离的自旋波脉冲。为了证明该概念的有效性，在短期存储器和奇偶校验基准任务上评估主动环库计算机，并且调整物理系统参数以优化性能。通过结合参考线将输入信号直接混合到有源环输出上，可以利用自旋波的幅度和相位非线性，从而显著改善非线性奇偶校验任务。我们还发现，系统的衰落记忆容量可以很容易地调整通过控制的主动环增益。最后，我们表明，第二个自旋波延迟线配置为向后传输体自旋波可以部分补偿色散脉冲展宽和增强衰减的记忆能力的活动环。
Recently we demonstrated experimentally that microwave oscillators based on the time delay feedback provided by traveling spin waves could operate as reservoir computers. In the present paper, we extend this concept by adding the feature of time multiplexing made available by the large propagation times/distances of traveling spin waves. The system utilizes the nonlinear behavior of propagating magnetostatic surface spin waves in a yttrium-iron garnet thin film and the time delay inherent in the active ring configuration to process time dependent data streams. Higher reservoir dimensionality is obtained through the time-multiplexing method, emulating"virtual"neurons as temporally separated spin-wave pulses circulating in the active ring below the auto-oscillation threshold. To demonstrate the efficacy of the concept, the active ring reservoir computer is evaluated on the short-term memory and parity check benchmark tasks, and the physical system parameters are tuned to optimize performance. By incorporating a reference line to mix the input signal directly onto the active ring output, both the amplitude and phase nonlinearity of the spin waves can be exploited, resulting in significant improvement on the nonlinear parity check task. We also find that the fading memory capacity of the system can be easily tuned by controlling the active ring gain. Finally, we show that the addition of a second spin-wave delay line configured to transmit backward volume spin waves can partly compensate dispersive pulse broadening and enhance the fading memory capacity of the active ring.