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SUMMARY:Quantum circuits: From ultra-strong light-matter coupling to balli
 stic transport in graphene
DTSTART:20180525T151500
DTEND:20180525T163000
DTSTAMP:20260408T092614Z
UID:a2d49136be72ccb6632aa69bc97a25a2e2b506c208be2d8c1c625b3c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Gary Steele\, Kavli Institute of Nanoscience\, Delft\nBio:
  Dr. Gary Steele\, born in Toronto\, Canada\, obtained his Ph. D. from MI
 T in 2006\, working with Prof. Raymond Ashoori on scanning capacitance im
 aging of the quantum Hall liquid. After his Ph. D.\, Gary moved to the K
 avli Institute of Nanoscience in Delft\, where he worked with Prof. Leo K
 ouwenhoven on ultraclean carbon nanotube quantum dots. In 2010\,  asa t
 enure-track assistant professor at the Kavli Institute in Delft\, he star
 ted a new group as working on nanomechanics. As a tenured Associate Prof
 essor since 2015\, Gary’s group now focuses on using quantum supercondu
 cting circuits to explore mechanics\, materials\, and topics in circuit 
 QED. Link to the webpage of the speaker\nIn this talk\, I will present two
  results from our recent work with superconducting microwave circuits. In 
 the first\, I will tell you about our implementation of ultra-strong ligh
 t-matter coupling using a compact vacuum-gap transmon qubit design. Motiva
 ted by a desire to analyze our data quantitatively\, we were led to a new
  circuit-quantisation model for this ultra-strong regime with transmon qub
 its\, with implications for understanding the problem of the convergence o
 f the Lamb shift and the quantum (or non-quantum) nature of the Lamb shif
 t itself.\n\nIn the second part of the talk\, I will tell you about our re
 cent work combining quantum circuits with ballistic graphene Josephson ju
 nctions. Using a unique technique that gives us simultaneous access to bot
 h the microwave and d.c. characteristics\, we both analyze the potential 
 of graphene devices for quantum microwave circuit applications\, and use t
 he microwave measurements to gain new insight into the current-phase rela
 tion of the induced mesoscopic proximity effect superconductivity.\n 
LOCATION:CE 1 5 https://plan.epfl.ch/?room==CE%201%205
STATUS:CONFIRMED
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