AI 中文总结
该研究展示了接近标准量子极限（SQL）的光电子振荡器（OEO），通过调控其量子态提升相位稳定性，验证了反馈振荡器量子增强的基本原理。
AI 中文摘要
反馈振荡器（如激光器和脉泽）是现代计算、通信和测量中的时间参考源。量子涨落最终限制了它们的相位稳定性和精确守时能力；在未进行量子工程调控的情况下，其相位稳定性受限于标准量子极限（SQL）。理论上存在可将反馈振荡器的频率稳定性提升至超越SQL的技术，但尚未得到实验验证。我们展示了一种光电子振荡器（OEO，属于反馈振荡器的一种），其相位稳定性接近SQL。随后，我们对该OEO的量子态进行调控以提升其相位稳定性，从而验证了反馈振荡器量子增强的基本原理。类似技术或可用于脉泽、激光器等其他反馈振荡器，以规避SQL的限制。
英文摘要
Feedback oscillators, such as lasers and masers, serve as time references in modern computing, communication, and measurement. Quantum fluctuations ultimately limit their phase stability and ability to keep time precisely; in the absence of quantum engineering, their phase stability is bounded by a standard quantum limit (SQL). Techniques to improve the frequency stability of feedback oscillators beyond the SQL have been theorized, but have not yet been demonstrated. We demonstrate an opto-electronic oscillator (OEO), a type of feedback oscillator, with phase stability approaching the SQL. We then engineer the OEO's quantum state to improve its phase stability, thereby demonstrating the essential principle quantum-enhancement of feedback oscillators. Similar techniques may be employed to evade the SQL in other feedback oscillators such as masers and lasers.
Comments6+15 pages, 9 figures
