Around the world, there are numerous different physical systems being developed in the quest to build quantum machines and perhaps one day a large-scale quantum information processor. Quantum electrical circuits based on Josephson junctions are one of the leading solid-state candidates. These systems have made remarkable progress in the past decade, and are a particular specialty here at Yale. One of the main technical challenges is whether such devices can attain a sufficient level of coherence. I will present the results of recent experiments on a very simple realization of a superconducting quantum bit, which has improved the state of the art for the coherence times by a large (~ 20x) factor, and let us probe the dissipation, stability, and the physics of decoherence in a Josephson junction with unprecedented precision. These experiments suggest that quantum circuits should be able to reach the quantum error correction threshold, allowing the construction of large scale quantum machines.
How coherent are Josephson junctions?
Speaker:
Professor Robert Schoelkopf
Department of Applied Physics
Faculty of Arts and Science, Yale University
Seminar Date:
Friday, November 4, 2011 - 12:00pm
Location:
BECTON SEMINAR ROOM
Prospect Street
New Haven, CT
Host:
Paul Fleury
Seminar Announcement Brochure: