Accelerated Weak Signal Search Using Mode Entanglement and State Swapping
Accelerated Weak Signal Search Using Mode Entanglement and State Swapping
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DOI：
10.1103/prxquantum.4.020302
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发表时间：
2022-11
期刊：
影响因子：
9.7
通讯作者：
Yue Jiang;E. Ruddy;K. Quinlan;M. Malnou;N. Frattini;K. Lehnert
中科院分区：
文献类型：
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作者：
Yue Jiang;E. Ruddy;K. Quinlan;M. Malnou;N. Frattini;K. Lehnert
量子涨落构成了限制基于腔的轴子暗物质搜索的主要噪声屏障。在一个旨在模拟真实的轴子搜索的实验中，我们采用量子增强传感技术来检测弱耦合到谐振器的未知频率的合成轴子微波音调，相对于量子限制搜索相同的音调，显示出5.6的加速因子。加速来自于探测器的可见度带宽和峰值可见度的增加。这种加速是通过动态耦合谐振器模式的第二（读出）模式与平衡交换和双模压缩相互作用。两个相互作用速率之间的一个小的分数不平衡产生进一步的扫描速率增强，我们证明，可以实现8倍的加速。
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.