金表面电场噪声的温度依赖性
Temperature Dependence of Electric Field Noise Above Gold Surfaces
摘要：
来自波动贴片电势的电场噪声对于广泛的精密实验是一个重要问题，包括捕获离子量子计算和单自旋检测。最近的研究结果表明，这种噪声的低温冷却，这表明一个潜在的热过程的强烈抑制。我们目前的测量特征的温度和频率依赖性的噪声从7到100 K，使用单个Sr+离子捕获75微米以上的表面镀金的表面电极离子阱。噪声幅度被观察到具有大约1 MHz的1/f频谱，并且随着温度的增加而快速增长，因为β从2到4时的T^beta。的数据是一致的微悬臂测量的非接触摩擦，但不外推到直流测量与中性原子或接触电位探针。
英文摘要：
Electric field noise from fluctuating patch potentials is a significant problem for a broad range of precision experiments, including trapped ion quantum computation and single spin detection. Recent results demonstrated strong suppression of this noise by cryogenic cooling, suggesting an underlying thermal process. We present measurements characterizing the temperature and frequency dependence of the noise from 7 to 100 K, using a single Sr+ ion trapped 75 um above the surface of a gold plated surface electrode ion trap. The noise amplitude is observed to have an approximate 1/f spectrum around 1 MHz, and grows rapidly with temperature as T^beta for beta from 2 to 4. The data are consistent with microfabricated cantilever measurements of non-contact friction but do not extrapolate to the DC measurements with neutral atoms or contact potential probes.
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