自由运行莫比乌斯微型 comb 中的拓扑抑制噪声

微型 comb 需要 ultralow-noise 的重复率才能实现下代数应用的 next-generation，这些应用包括 metrology、高速通信、微波光子学和感知，其中谱纯度是 central performance metric。表现最佳的源 operating actively locked at "quiet points" in parameter space，由 device and material properties 固定。Creating broad, low-noise operating regions with relaxed constraints-especially in simplified free-running architectures that avoid electronics-heavy control- remains an open challenge。Here, we demonstrate a symmetry-protected topological M"obius soliton molecule that enables intrinsically low phase noise in a fully free-running microcomb, operating without any external referencing or control。Using a microresonator-filtered laser, we implement a M"obius geometry via interleaved microcavity modes。Upon the formation of a topological M"obius soliton molecule, the free-running laser exhibits over 15 dB of phase-noise suppression across 10 Hz-10 kHz at a 100 GHz repetition rate, yielding -63 dBc/Hz phase noise at 1 kHz and an Allan deviation of 4x10^-10 at 10 s average time-without any external control。We show that the M"obius structure brings dynamic robustness to the comb, and we demonstrate a symmetry-protected topological regime that enables long-term drift-invariant operation。Our results establish a route to intrinsically noise-quenched microcombs operating in a fully free-running configuration, governed by internal physical principles and suitable for field-deployable, low-noise photonic systems。