超低功耗声子梳的产生
Generation of Ultra-Low Power Phononic Combs
摘要：
我们演示了激发声子频率梳体声波系统中的温度为$20$ mK使用一个单音低功率信号源。观察到的超低功率阈值是由于$4.2\times 10^8$的非常高的品质因数和相对强的非线性效应的组合。观察到的梳的重复频率从0.7到2Hz不等，跨度超过几十赫兹。演示系统完全通过压电激发，不需要模式谱工程和外部光学或微波信号。结果表明，梳状轮廓显着依赖于几何形状的激发和检测电极。观察到的强Duffing非线性低于生成阈值表明，该系统是一个声子模拟克尔频率梳激发单片光学微谐振器。超低功耗机制开辟了一条将声子系统与量子混合系统（如杂质缺陷和超导量子比特）集成的途径。
英文摘要：
We demonstrate excitation of phononic frequency combs in a Bulk Acoustic Wave system at a temperature of $20$mK using a single tone low power signal source. The observed ultra low power threshold is due to a combination of very high quality factor of $4.2\times 10^8$ and relatively strong nonlinear effects. The observed repetition rate of the comb varies from 0.7 to 2Hz and spans over tens of Hertz. The demonstrated system is fully excited via piezoelectricity and does not require mode spectra engineering and external optical or microwave signals. It is shown that the comb profile significantly depends on geometry of excitation and detection electrodes. Observed strong Duffing nonlinearity below the generation threshold suggests that the system is a phononic analogue to Kerr frequency combs excited in monolithic optical microresonators. The ultra-low power regime opens a way of integrating this phononic system with quantum hybrid systems such as impurity defects and superconducting qubits.
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