高超声速晶体的量子力学
Quantum electromechanics of a hypersonic crystal
摘要：
工程结构内的辐射压力最近已被用于耦合纳米机械物体的运动，具有高灵敏度的光学和微波电磁场。在这里，我们展示了一种形式的机电晶体耦合微波光子和高超音速声子嵌入的真空间隙电容器的超导谐振器内的声子晶体声腔。利用双光子共振条件有效的微波泵浦和声子带隙屏蔽，以消除声辐射，我们证明了大的合作耦合（$C \approx 30$）之间的一对电谐振在$10$ GHz和一个声谐振在$0.425$ GHz。声子占有率的电读出表明，高超音速声学模式具有$2.3$ ms的内禀能量衰减时间，并且在$10$ mK的冰箱温度下接近其量子基态运动（占有率$1.5$）。这种机电换能器被设想为混合量子线路架构的一部分，能够与超导量子比特和光学光子两者接口。
英文摘要：
Radiation pressure within engineered structures has recently been used to couple the motion of nanomechanical objects with high sensitivity to optical and microwave electromagnetic fields. Here, we demonstrate a form of electromechanical crystal for coupling microwave photons and hypersonic phonons by embedding the vacuum-gap capacitor of a superconducting resonator within a phononic crystal acoustic cavity. Utilizing a two-photon resonance condition for efficient microwave pumping and a phononic bandgap shield to eliminate acoustic radiation, we demonstrate large cooperative coupling ($C \approx 30$) between a pair of electrical resonances at $10$GHz and an acoustic resonance at $0.425$GHz. Electrical read-out of the phonon occupancy shows that the hypersonic acoustic mode has an intrinsic energy decay time of $2.3$ms and thermalizes close to its quantum ground-state of motion (occupancy $1.5$) at a fridge temperature of $10$mK. Such an electromechanical transducer is envisioned as part of a hybrid quantum circuit architecture, capable of interfacing to both superconducting qubits and optical photons.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
