Waiting time distributions in a two-level fluctuator coupled to a superconducting charge detector

Máté Jenei, Elina Potanina, Ruichen Zhao, Kuan Y. Tan, Alessandro Rossi, Tuomo Tanttu, Kok W. Chan, Vasilii Sevriuk, Mikko Möttönen, Andrew Dzurak

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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.
Original languageEnglish
Article number033163
Number of pages6
JournalPhysical Review Research
Issue number3
Publication statusPublished - 10 Dec 2019


  • charge fluctuations
  • superconducting Josephson-junction-based charge detector
  • quantum physics

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