量子增强搜索暗物质轴子
A quantum-enhanced search for dark matter axions
摘要：
在暗物质轴子搜索中，量子不确定性表现为基本噪声源，限制了用于检测的正交可观测量的测量。我们利用真空压缩来绕过量子极限，寻找新的粒子。通过在压缩状态下制备微波频率的电磁场，并几乎无噪声地只读出压缩正交，我们在最近的理论预测所青睐的质量范围内将轴子的搜索速率提高了一倍。我们没有观察到暗物质轴子在组合$16.96-17.12$和$17.14-17.28\spaceμ\text{eV}/c^2$质量窗口的轴子-光子耦合以上$g_γ = 1.38\times g_γ^\text{KSVZ}$，报告排除在90%的水平。
英文摘要：
In dark matter axion searches, quantum uncertainty manifests as a fundamental noise source, limiting the measurement of the quadrature observables used for detection. We use vacuum squeezing to circumvent the quantum limit in a search for a new particle. By preparing a microwave-frequency electromagnetic field in a squeezed state and near-noiselessly reading out only the squeezed quadrature, we double the search rate for axions over a mass range favored by recent theoretical projections. We observe no signature of dark matter axions in the combined $16.96-17.12$ and $17.14-17.28\spaceμ\text{eV}/c^2$ mass window for axion-photon couplings above $g_γ = 1.38\times g_γ^\text{KSVZ}$, reporting exclusion at the 90% level.
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