University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Thursday, August 20th 2009
1:25 pm:
Condensed Matter Seminar in 210 Physics
Speaker: Robert Anderson, Physics Department, University of Maryland
Subject: Quantum Computing Based on Josephson-Junction SQUID Phase Qubits

Quantum computing based on many different types of qubits has become an important field of research. A quantum computer with its entangled qubits should provide a much more efficient technique for specific tasks such as finding prime factors of large numbers and searching a non-structured data base. We are investigating the use of Josephson junctions in a SQUID configuration for these qubits. For success, the time for logic gate operations must be shorter than the coherence times. In this talk reviews of our experiments to make better junctions and to study and eliminate the sources of decoherence will be presented. Investigations of coherence times via Rabi oscillations and the Ramsey effect will be described and the reason for using a SQUID phase qubit will be discussed. A significant improvement in coherence times during this year has been obtained.

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