用于原子物理实验的低相位噪声腔传输自注入锁定激光系统
A low phase noise cavity transmission self-injection locked laser system for atomic physics experiments
AI总结：
本文提出一种利用中等精细度腔的自注入锁定二极管激光系统，有效抑制快速相位噪声，相比PDH稳定激光器改善20-30 dB，适用于原子物理实验中的高保真量子操控。
摘要：
具有高光谱纯度的激光器对于光学钟以及用于量子计算和量子模拟等应用的原子和分子量子比特的相干操控不可或缺。将激光稳定到参考腔可以提供窄线宽和高光谱纯度。然而，广泛使用的二极管激光器表现出快速相位噪声，这阻碍了高保真度的量子比特操控。在此，我们演示了一种利用中等精细度腔的自注入锁定二极管激光系统。该腔不仅提供稳定的共振频率，同时还充当相位噪声的低通滤波器，可滤除超过约100 kHz腔线宽的相位噪声，从而在从直流到注入锁定极限的范围内实现低相位噪声。我们对预期激光性能进行建模，并使用单个囚禁的$^{40}$Ca$^{+}$离子作为频谱分析仪对其进行基准测试。我们表明，激光在100 kHz至>2 MHz相关傅里叶频率下的快速相位噪声被抑制到-110 dBc/Hz至-120 dBc/Hz之间的噪声底，相比最先进的Pound-Drever-Hall稳定外腔二极管激光器改善了20至30 dB。这种强抑制避免了光学量子比特操控过程中的非相干（杂散）自旋翻转，并改善了使用二极管激光器的激光驱动门操作，在量子逻辑光谱学、量子模拟和量子计算中具有应用前景。
英文摘要：
Lasers with high spectral purity are indispensable for optical clocks and coherent manipulation of atomic and molecular qubits for applications such as quantum computing and quantum simulation. Stabilisation of the laser to a reference can provide a narrow linewidth and high spectral purity. However, widely-used diode lasers exhibit fast phase noise that prevents high fidelity qubit manipulation. Here we demonstrate a self-injection locked diode laser system utilizing a medium finesse cavity. The cavity not only provides a stable resonance frequency, but at the same time acts as a low-pass filter for phase noise beyond the cavity linewidth of around 100 kHz, resulting in low phase noise from dc to the injection lock limit. We model the expected laser performance and benchmark it using a single trapped $^{40}$Ca$^{+}$-ion as a spectrum analyser. We show that the fast phase noise of the laser at relevant Fourier frequencies of 100 kHz to >2 MHz is suppressed to a noise floor of between -110 dBc/Hz and -120 dBc/Hz, an improvement of 20 to 30 dB over state-of-the-art Pound-Drever-Hall-stabilized extended-cavity diode lasers. This strong suppression avoids incoherent (spurious) spin flips during manipulation of optical qubits and improves laser-driven gates in using diode lasers with applications in quantum logic spectroscopy, quantum simulation and quantum computation.
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