Quantum Coherent Communications Beyond Current Limits

项目简介：本研究项目探讨奈米尺度装置中的参数化磁振子-声子耦合.为此，支撑在钇铁石榴石（YIG）薄膜中的磁振子被耦合到体衬底（其上生长有磁振子）的弯曲（声子）模式，图案化为悬臂和/或桥谐振结构。这既提供了与芯片设计兼容的纳米级实现，也提供了一种通用设备的前景，其中可以很容易地集成较小机械阻尼的基板。宗旨/目标：我们将研究的蓝色失谐驱动制度，声子“激光”的预期和比较的结果，纳米级系统正在考虑的最先进的实验与毫米大小的球体YIG。此外，非线性（克尔）效应预计在相对较低的驱动功率，由于小的磁体积，这些将被探讨。如果时间允许，可以尝试GGG衬底谐振器结构的制造，以测量和理解机械Q的限制。研究方法：运用投入产出理论、二次量子化、欧拉-伯努利梁理论.对齐：物理和数学科学发电站，凝聚态物理。

Project Description: The research project explores parametric magnon - phonon coupling in a nanoscale device. For this, magnons supported in thin films of yttrium-iron-garnet (YIG) are coupled to the flexure (phonon) modes of the bulk substrate (on which it is grown), patterned into cantilever and / or bridge resonant structures. This offers both a nano-scale implementation compatible with chip designs, as well as the promise of a versatile device in which substrates of a smaller mechanical damping could easily be integrated. Aims / objectives: We will study the blue detuned drive regime where phonon "lasing" is expected and compare the results for the nanoscale system under consideration to state of the art experiments performed with mm sized spheres of YIG. In addition, non-linear (Kerr) effects are expected at relatively low drive powers due to the small magnetic volume, and these will be explored. Fabrication of the GGG substrate resonator structures may be attempted, if time permits, to measure and understand the limitations in the mechanical Q. Methodology: Use of input - output theory, second quantization, Euler - Bernoulli beam theory. Alignment: Physical and Mathematical sciences powerhouse, condensed matter physics.