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UID:UW-Physics-Event-4455
DTSTART:20170320T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T042529Z
LAST-MODIFIED:20170317T114751Z
LOCATION:5310 Chamberlin
SUMMARY:Revealing quantum behavior with coupled superconducting device
 s \, R. G. Herb Condensed Matter Seminar\, Prof. Nadav Katz\,  Racah I
 nstitute of Physics\, Hebrew University of Jerusalem
DESCRIPTION:I will present two projects\, based on coupled superconduc
 ting resonator devices:<br>
\n1. Atomic sized two-level systems (TLSs)
  in dielectrics are known as a major source of loss in superconducting
  devices\, particularly due to frequency noise. However\, the induced 
 frequency shifts on the devices\, even by far off-resonance TLSs\, is 
 often suppressed by symmetry when standard single-tone spectroscopy is
  used. We introduce a two-tone spectroscopy on the normal modes of a p
 air of coupled superconducting coplanar waveguide resonators to uncove
 r this effect by asymmetric saturation. Together with an appropriate g
 eneralized saturation model this enables us to extract the average sin
 gle-photon Rabi frequency of dominant TLSs to be Ω0/2π≈79 kHz. At 
 high photon numbers we observe an enhanced sensitivity to nonlinear ki
 netic inductance when using the two-tone method and estimate the value
  of the Kerr coefficient as K/2π≈−1×10−4 Hz/photon. Furthermor
 e\, the life-time of each resonance can be controlled (increased) by p
 umping of the other mode as demonstrated both experimentally and theor
 etically.<br>
\n<br>
\n2. Multiple bosons undergoing coherent evolutio
 n in a coupled network of resonators constitute a so-called quantum wa
 lk system. The simplest example of such a two-particle interference is
  the celebrated Hong-Ou-Mandel interference. When scaling to larger bo
 son numbers\, simulating the exact distribution of bosons has been sho
 wn\, under reasonable assumptions\, to be exponentially hard. We analy
 ze the feasibility and expected performance of a globally connected su
 perconducting resonator based quantum walk system\, using the known ch
 aracteristics of state-of-the-art components. We simulate the sensitiv
 ity of such a system to decay processes and to perturbations and compa
 re with coherent input states. 
URL:https://www.physics.wisc.edu/events/?id=4455
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