We analyze charge fluctuations in a parasitic state strongly coupled to a superconducting Josephson-junction-based charge detector. The charge dynamics of the state resembles that of electron transport in a quantum dot with two charge states, and hence we refer to it as a two-level fluctuator. By constructing the distribution of waiting times from the measured detector signal and comparing it with a waiting time theory, we extract the electron in- and out-tunneling rates for the two-level fluctuator, which are severely asymmetric.
|Number of pages||6|
|Journal||Physical Review Research|
|Publication status||Published - 10 Dec 2019|
- charge fluctuations
- superconducting Josephson-junction-based charge detector
- quantum physics