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UID:1611655200@ist.ac.at
DTSTART:20210126T110000
DTEND:20210126T120000
DESCRIPTION:Speaker: Gianluca Aiello\nhosted by Johannes Fink\nAbstract: In
  this talk I will discuss the dynamics of a high impedance microwave cavit
 y galvanically coupled to a DC biased Josephson junction\, focusing in par
 ticular on how the occupation and the properties of the cavity modes are a
 ffected by the charge tunneling processes occurring in the junction. At lo
 w voltages compared to the superconducting gap of the junction\, the domin
 ant process is the inelastic tunneling of Cooper pairs\, which populates t
 he different cavity modes [1\, 2]. We directly measure the photon emission
  in one mode at 6 GHz and observe more than 70 emission peaks as a functio
 n of bias voltage. At larger voltages close to the gap\, quasiparticle tun
 neling dominates. This  dissipative process modifies both the resonance f
 requency and the linewidth of the modes. A quantum treatment of this proce
 ss in terms of Lamb shift and quantum jumps is required to quantitatively 
 explain our measurements [3]. We show that the Lamb shift gives rise to a 
 nonlinear spectrum of the resonator and that the loss rate induced by the 
 junction can be exploited for the realization of quantum Zeno dynamics.Ref
 erences[1] M. Hofheinz et al. “Bright side of the coulomb blockade”. I
 n: Physical Review Letters 106.21(2011). DOI: 10.1103/PhysRevLett.106.2170
 05.[2] C. Rolland et al. “Antibunched Photons Emitted by a dc-Biased Jos
 ephson Junction”. In:Physical Review Letters 122.18 (2019). DOI: 10.1103
 /PhysRevLett.122.186804.[3] J. Esteve\, M. Aprili\, and J. Gabelli. “Qua
 ntum dynamics of a microwave resonator stronglycoupled to a tunnel junctio
 n”. In: (2018). arXiv: 1807.02364.
LOCATION:ONLINE via Zoom\, ISTA
ORGANIZER:
SUMMARY:Gianluca Aiello: Quantum dynamics of a high impedance cavity couple
 d to a Josephson junction
URL:https://talks-calendar.ista.ac.at/events/3059
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