Condensed Matter Seminar - "Transport in Josephson junctions and qubits: Phase diffusion and quasiparticle dynamics"
- Sponsor
- Physics - Condensed Matter
- Speaker
- Venkat Chandrasekhar, Northwestern University
- Contact
- Stephen Bullwinkel
- bullwink@illinois.edu
- Phone
- 217-333-1652
- Views
- 62
- Originating Calendar
- Physics - Condensed Matter Seminar
Josephson junctions are the core of superconducting qubits. They have been studied extensively for more than 40 years, and it might be assumed that their behavior is well understood. I will discuss our low frequency transport measurements on small isolated Josephson junctions and Josephson junctions in transmon configurations. The isolated junctions show effects known to be associated with small capacitance junctions. Surprisingly, the junctions in a transmon configuration show almost identical behavior, in spite of being shunted with a large capacitance. I will also discuss our experiments on studying quasiparticle dynamics in Al films motivated by the desire to mitigate the deleterious effects of quasiparticles on superconducting qubits.
1. Wisne et al., Mater. Quantum Technol. 4, 046001 (2024).
2. V. Chandrasekhar, Physics Letters A, 507, 129493 (2024)
3. K.M. Ryan and V. Chandrasekhar, Appl. PHys. Lett. 127, 072603.