用于高频应变与光频梳产生的金刚石光力晶体
Diamond optomechanical crystals for high-frequency strain and comb generation
AI总结：
本研究开发了金刚石光力晶体腔，实现了约12 GHz的高频机械共振与143 GHz光频梳，其动态应变达1.1×10⁻³，可用于金刚石自旋量子比特的光力控制。
AI中文摘要：
量子光力技术得益于高频、可相干驱动且能与其他量子系统耦合的机械振荡器，金刚石满足所有这些要求：其高弹性模量提升了机械共振频率，低非线性光学吸收增加了相干光力所用场的允许强度，且金刚石中存在可与机械模式相互作用的自旋量子比特。本文展示了一种金刚石光力晶体腔，该腔支持多个约12 GHz频率的机械共振，且具有高Qₘ×fₘ乘积，可与多个光学模式相干耦合。通过将该边带分辨系统激发为机械自持续振荡，我们产生了跨度达143 GHz的光频梳。对光频梳频谱的分析，结合对系统光力耦合的系统表征，使我们能够定量证明其机械振荡振幅达到130 pm，对应最大总动态应变为1.1×10⁻³，该应变足以用于未来金刚石自旋量子比特的光力控制演示。
英文摘要：
Quantum optomechanical technologies benefit from mechanical oscillators that are high-frequency, can be coherently driven, and are capable of coupling to other quantum systems. Diamond supports all of these criteria: its large elastic modulus increases mechanical resonance frequency, its low nonlinear optical absorption increases the allowed intensity of fields used for coherent optomechanics, and it hosts spin qubits that interact with mechanical modes. Here we demonstrate a diamond optomechanical crystal cavity that supports multiple mechanical resonances with $\sim$12 GHz frequency and high $Q_\text{m} \times f_\text{m}$ product that can be coherently coupled to multiple optical modes. By exciting this sideband resolved system into mechanical self-sustained oscillations, we generate a frequency comb spanning 143 GHz. Analysis of the comb spectrum, combined with systematic characterization of the system's optomechanical coupling, allows us to quantitatively show that its mechanical oscillation amplitude reaches 130 pm. This corresponds to a maximum total dynamic strain of $1.1 \times 10^{-3}$ that is sufficiently high for future demonstrations of optomechanical control of diamond spin qubits.
