BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8766
DTSTART:20240530T150000Z
DTEND:20240530T230000Z
DTSTAMP:20260413T184629Z
LAST-MODIFIED:20240523T231148Z
LOCATION:5310 Chamberlin
SUMMARY:Resonant Bloch oscillations in transmons embedded in high-impe
 dance circuits  \, R. G. Herb Condensed Matter Seminar\, Benjamin Reme
 z\, Yale University
DESCRIPTION:Superconducting circuits offer a unique setting to explore
  the strong-coupling counterpart to standard electrodynamics\, with wh
 ich a variety of quantum devices can be realized. A prerequisite for s
 uch strong coupling is a medium with very high characteristic impedanc
 e\, which can be achieved by recently developed Josephson junction arr
 ay transmission lines\, dubbed “super-inductors”. These provide bo
 th the high impedance needed for strong quantum fluctuations\, and pho
 ton modes with which to probe a quantum device\, such as a small Josep
 hson junction – i.e. a superconducting qubit. In this high-impedance
  environment\, current through the junction is suppressed by Coulomb b
 lockade\, and is accompanied by Bloch oscillations analogous to those 
 in crystalline systems. However\, the interplay between Bloch oscillat
 ions and environmental photon resonances remains largely unexplored. I
 n this talk I will give a brief introduction to circuit electrodynamic
 s\, superconducting qubits\, and the superconductor-insulator transiti
 on. Then I will develop a model for Bloch oscillations in a transmon-t
 ype qubit placed in a high-impedance cavity [1]. The latter’s discre
 te spectrum will cause resonances in the voltage–current relation an
 d the spectrum of photons radiated by the transmon. The transmon also 
 scatters cavity photons inelastically\; I will show a novel anti-Stoke
 s-like process whereby photons gain a Bloch oscillation quantum. These
  signatures show how Bloch oscillations leave fingerprints across disp
 arate energy scales. Time permitting\, I will discuss how our model ex
 tend to treating dual Bloch-Shapiro steps in shunted transmons\, with 
 applications to quantum metrology [2].
\n 
\n[1] B. Remez\, V. D. Kuri
 lovich\, M. Rieger\, and L. I. Glazman\, Bloch Oscillations in a Trans
 mon Embedded in a Resonant Electromagnetic Environment\, arXiv:2403.04
 623.
\n[2] V. D. Kurilovich\, B. Remez\, and L. I. Glazman\, Quantum T
 heory of Bloch Oscillations in a Resistively Shunted Transmon\, arXiv:
 2403.04624.
URL:https://www.physics.wisc.edu/events/?id=8766
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