Condensed Matter Seminar - "Critical fluorescence of a transmon at the Schmid transition"
- Event Type
- Seminar/Symposium
- Sponsor
- Physics - Condensed Matter
- Virtual
- Date
- Mar 5, 2021 1:00 pm
- Speaker
- Leonid Glazman, Yale University
- Contact
- Stephen Bullwinkel
- bullwink@illinois.edu
- Phone
- 217-333-1652
- Views
- 43
- Originating Calendar
- Physics - Condensed Matter Seminar
We investigate the quantum dynamics of a transmon qubit embedded in a high-impedance circuit. The transmon undergoes a charge-localization (Schmid) transition upon the impedance reaching a critical value. Due to the unique level structure of a transmon its microwave fluorescence spectrum carries a signature of the transition. The integrated intensity of the fluorescence spectrum yields the total cross-section of inelastic photon scattering. Our theory of the inelastic cross-section explains the recently measured quality factors of devices consisting of a transmon in a galvanic connection with a high-impedance array of Josephson junctions.