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SUMMARY:Resonant Bloch oscillations in transmons embedded in high-impedanc
 e circuits   - Benjamin Remez (Yale)
DTSTART:20240425T130000Z
DTEND:20240425T140000Z
UID:TALK211339@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:Superconducting circuits offers a unique setting to explore th
 e strong-coupling counterpart to standard electrodynamics\, with which a v
 ariety of quantum devices can be realized. A prerequisite for such strong 
 coupling is a medium with very high characteristic impedance\, which can b
 e achieved by recently developed Josephson junction array transmission lin
 es\, dubbed “super-inductors”. These provide both the high impedance n
 eeded for strong quantum fluctuations\, and photon modes with which to pro
 be a quantum device\, such as a small Josephson junction – i.e. a superc
 onducting qubit. In this high-impedance environment\, current through the 
 junction is suppressed by Coulomb blockade\, and is accompanied by Bloch o
 scillations analogous to those in crystalline systems. However\, the inter
 play between Bloch oscillations and environmental photon resonances remain
 s largely unexplored. In this talk I will give a brief introduction to cir
 cuit electrodynamics\, superconducting qubits\, and the superconductor-ins
 ulator transition. Then I will develop a model for Bloch oscillations in a
  transmon-type qubit placed in a high-impedance cavity [1]. The latter’s
  discrete spectrum will cause resonances in the voltage–current relation
  and the spectrum of photons radiated by the transmon. The transmon also s
 catters cavity photons inelastically\; I will show a novel anti-Stokes-lik
 e process whereby photons gain a Bloch oscillation quantum. These signatur
 es show how Bloch oscillations leave fingerprints across disparate energy 
 scales. Time permitting\, I will discuss how such Bloch oscillations give 
 rise to dual-Shapiro steps\, with applications to quantum metrology [2].\n
 \n \n\n[1] B. Remez\, V. D. Kurilovich\, M. Rieger\, and L. I. Glazman\, B
 loch Oscillations in a Transmon Embedded in a Resonant Electromagnetic Env
 ironment\, arXiv:2403.04623.\n\n[2] V. D. Kurilovich\, B. Remez\, and L. I
 . Glazman\, Quantum Theory of Bloch Oscillations in a Resistively Shunted 
 Transmon\, arXiv:2403.04624.
LOCATION:TCM Seminar Room
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