加速寻找轴子暗物质的腔纠缠和态交换方法
A cavity entanglement and state swapping method to accelerate the search for axion dark matter
摘要：
在基于腔的轴子暗物质探测器中，量子噪声仍然是实现全面搜索轴子参数空间所需的扫描速率的主要障碍。在这里，我们介绍了一种方法的扫描速率增强，其中轴子敏感腔耦合到一个辅助谐振电路，通过同时双模压缩（纠缠）和状态交换相互作用。我们分析表明，当结合起来，这些相互作用可以放大轴子信号之前，它成为测量引入的真空噪声污染。这种内部放大产生了更宽的轴子灵敏度带宽，增加了探测器在频率空间中搜索的速度。通过对该系统的电路模拟预测的相互作用速率，我们表明，相对于受真空噪声限制的检测器的扫描速率，这种技术可以将扫描速率提高到15倍。
英文摘要：
In cavity-based axion dark matter detectors, quantum noise remains a primary barrier to achieving the scan rate necessary for a comprehensive search of axion parameter space. Here we introduce a method of scan rate enhancement in which an axion-sensitive cavity is coupled to an auxiliary resonant circuit through simultaneous two-mode squeezing (entangling) and state swapping interactions. We show analytically that when combined, these interactions can amplify an axion signal before it becomes polluted by vacuum noise introduced by measurement. This internal amplification yields a wider bandwidth of axion sensitivity, increasing the rate at which the detector can search through frequency space. With interaction rates predicted by circuit simulations of this system, we show that this technique can increase the scan rate up to 15-fold relative to the scan rate of a detector limited by vacuum noise.
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