论文标题
用宏观共振隧道探测通量和电荷噪声
Probing flux and charge noise with macroscopic resonant tunneling
论文作者
论文摘要
我们使用宏观谐振隧道（MRT）报告了RF式通量量子量子量子（MRT）中通量和电荷噪声的测量。我们测量从初始井中最低能量状态到地面的最低能量状态的不一致隧道的速率，并在目标井中首先激发态度。测量结果由两个峰组成。第一个峰对应于隧穿到目标井的基态，并由通量噪声支配。第二个峰是由于隧穿到激发态的原因，并且由于电气噪声以电荷噪声为主，因此更宽。我们开发了一个理论模型，使我们能够在一个实验设置中提取有关通量和电荷噪声的信息。该模型与广泛的动态范围内的实验数据非常吻合，并提供了表征电荷和通量噪声的参数。
We report on measurements of flux and charge noise in an rf-SQUID flux qubit using macroscopic resonant tunneling (MRT). We measure rates of incoherent tunneling from the lowest energy state in the initial well to the ground and first excited states in the target well. The result of the measurement consists of two peaks. The first peak corresponds to tunneling to the ground state of the target well, and is dominated by flux noise. The second peak is due to tunneling to the excited state and is wider due to an intrawell relaxation process dominated by charge noise. We develop a theoretical model that allows us to extract information about flux and charge noise within one experimental setup. The model agrees very well with experimental data over a wide dynamic range and provides parameters that characterize charge and flux noise.
