声子波导中的宽带可重构逻辑门
Broadband reconfigurable logic gates in phonon waveguides
摘要：
机电系统中的高品质因数机械谐振器促进了通过参量非线性过程对声子的动态控制，并为机械逻辑元件的发展铺平了道路。然而，具有窄带宽的谐振元件限制了所得到的操作速度，并且将非线性现象的可用性限制在窄的光谱范围内。为了克服这些缺点，我们已经开发了声子波导，其中四波混频的机械模拟被证明，使声子波的频率被转换超过1 MHz。我们利用这个平台并行执行多个二进制机械逻辑门，通过频分复用在两个倍频程宽的声子传输带，每个门可以独立重新配置。验证通过时间测量产生的眼图，确认高速逻辑运算的可用性的二进制门的保真度。因此，声子波导架构提供了实现机械信号处理器所必需的宽带功能。
英文摘要：
The high-quality-factor mechanical resonator in electromechanical systems has facilitated dynamic control of phonons via parametric nonlinear processes and paved the development of mechanical logic-elements. However the resonating element with a narrow bandwidth limits the resultant operation speeds as well as constraining the availability of nonlinear phenomena to a narrow spectral range. To overcome these drawbacks we have developed phonon waveguides in which the mechanical analogue of four-wave-mixing is demonstrated that enables the frequency of phonon waves to be converted over 1 MHz. We harness this platform to execute multiple binary mechanical logic gates in parallel, via frequency division multiplexing in a two-octave-wide phonon transmission band, where each gate can be independently reconfigured. The fidelity of the binary gates is verified via temporal measurements yielding eye diagrams which confirm the availability of high speed logic operations. The phonon waveguide architecture thus offers the broadband functionality that is essential to realising mechanical signal processors.
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