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Lecture William D. Oliver


31 July 2006 FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. William D. Oliver
Affiliation:MIT, Lincoln Laboratory, USA
Title:Mach-Zehnder-Type interferometry in a superconducting persistent-current qubit
Date:Mon Jul 31, 2006
Location:FWN-Building 5113.0201
Host:C.H. van der Wal
Telephone:+31 50 363 4445


We present our recent demonstration of Mach-Zehnder-type interferometry in a superconducting persistent-current qubit. The qubit?s ground and first-excited states exhibit an avoided crossing. Strongly driving the qubit with harmonic excitation sweeps it through the avoided crossing two times per period. The induced Landau-Zener transitions act as coherent beamsplitters, and the accumulated phase between transitions varies with microwave amplitude. We have observed quantum interference fringes for 1?20 photon excitations. In parallel, we have developed a fully-planarized fabrication process with niobium capable of achieving 100 nm diameter junctions. This talk will present and discuss these experimental results.
Last modified:22 October 2012 2.30 p.m.