论文标题
电子自旋共振，最多使用超导通量值测量的20个自旋灵敏度
Electron Spin Resonance with up to 20 Spin Sensitivity Measured using a Superconducting Flux Qubit
论文作者
论文摘要
我们使用具有6 fl的传感体积的超导通量量子置量置量置量置量量子进行了电子自旋谐振光谱测量。使用可频率的Josephson分叉放大器读取量子，这在1 s的测量中导致了大约20个自旋的测量灵敏度。与使用DC-squid开关读数相比，这种敏感性代表了数量级的改善。此外，噪声光谱表明，灵敏度受闪烁（$ 1/f $）通量噪声的限制。
We report on electron spin resonance spectroscopy measurements using a superconducting flux qubit with a sensing volume of 6 fl. The qubit is read out using a frequency-tunable Josephson bifurcation amplifier, which leads to an inferred measurement sensitivity of about 20 spins in a 1 s measurement. This sensitivity represents an order of magnitude improvement when compared with flux-qubit schemes using a dc-SQUID switching readout. Furthermore, noise spectroscopy reveals that the sensitivity is limited by flicker ($1/f$) flux noise.
