论文标题
使用模式纠缠和交换，带宽和可见性提高了弱信号的检测
Bandwidth and visibility improvement in detection of a weak signal using mode entanglement and swapping
论文作者
论文摘要
量子波动构成了基于腔的斧头暗物质搜索的主要噪声屏障。在旨在模仿真实斧头搜索的实验中，我们采用了一种量子增强的感应技术来检测弱耦合与谐振器的未知频率的合成轴状微波音，证明了相对于量子限制搜索相同基调的5.6加速度。加速度来自探测器的可见性带宽和峰见性。通过将谐振器模式与平衡交换和两种模式挤压交互的第二个（读取）模式动态耦合，可以实现此加速。两个相互作用速率之间的小部分失衡会进一步提高扫描速率，我们证明可以实现8倍的加速度。
Quantum fluctuations constitute the primary noise barrier limiting cavity-based axion dark matter searches. In an experiment designed to mimic a real axion search, we employ a quantum-enhanced sensing technique to detect a synthetic axion-like microwave tone at an unknown frequency weakly coupled to a resonator, demonstrating a factor of 5.6 acceleration relative to a quantum-limited search for the same tone. The acceleration comes from increases to both the visibility bandwidth and the peak visibility of a detector. This speedup is achieved by dynamically coupling the resonator mode to a second (readout) mode with balanced swapping and two-mode squeezing interactions. A small fractional imbalance between the two interaction rates yields further scan rate enhancement and we demonstrate that an 8-fold acceleration can be achieved.
