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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-6853
DTSTART:20220308T160000Z
DTEND:20220308T170000Z
DTSTAMP:20260414T113226Z
LAST-MODIFIED:20220203T174054Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Simulating quantum many-body phenomena with superconducting qu
 bits\, R. G. Herb Condensed Matter Seminar\, Roman Kuzmin\, University
  of Maryland
DESCRIPTION:Superconducting circuits are ubiquitous in quantum simulat
 ions\, computing\, and metrology. In this talk\, I will show a superco
 nducting circuit platform extended to the extreme\, in which the circu
 its actually become insulating. Remarkably\, such nominally insulating
  circuits are a valuable resource. They create a tunable high-impedanc
 e environment and facilitate exceptionally strong interactions between
  photons and superconducting qubits. This opens up new directions for 
 analog quantum simulations of interacting many-body problems\, with ex
 amples ranging from quantum phase transitions to many-body localizatio
 n.
\n
\nIn particular\, I will start with the demonstration of a dissi
 pative quantum phase transition in a Josephson junction facing an Ohmi
 c environment. Despite many experimental attempts\, the existence of s
 uch a transition remains controversial. Using the high-impedance circu
 it environment\, I will present evidence of the transition with a conc
 eptually new approach\, which relies on monitoring environmental degre
 es of freedom. A similar approach applies to analog quantum simulation
 s of other strongly interacting models\, which I will illustrate on tw
 o quantum impurity models relevant to the physics of Luttinger liquids
  and the Kondo effect. In the latter case\, interactions induced by a 
 quantum impurity in a finite size system allow us to observe the pheno
 menon of many-body localization. Finally\, I will argue that the high-
 impedance circuit platform can contribute to the development of variou
 s areas of quantum science and technology.
URL:https://www.physics.wisc.edu/events/?id=6853
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