Accession Number : ADA545158


Title :   Controlling Decoherence in Superconducting Qubits: Phenomenological Model and Microscopic Origin of 1/f Noise


Descriptive Note : Final rept. 1 Jun 2006-28 Feb 2010


Corporate Author : RUTGERS - THE STATE UNIV PISCATAWAY NJ OFFICE OF RESEARCH AND SPONSORED PROGRAMS


Personal Author(s) : Ioffe, Lev B ; Faoro, Lara


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a545158.pdf


Report Date : 28 Apr 2011


Pagination or Media Count : 5


Abstract : During these three years project we have made a very significant progress in our research program, especially in the theoretical understanding of the microscopic origin of the noise. Briefly, we came up with microscopic models for charge noise, critical current fluctuations and quasiparticle poisoning which include a completely novel physical origin of these noises. We also proposed a model for excess low frequency flux noise which agrees very well with all existing data. We established strong and very active collaborations with leading experimental groups [NEC, Tsukuba (Dr. O. Astafiev and Dr. Y. Pashkin), USCB (Prof. J. Martinis), UW-Madison (Dr. R. McDermott), Institute Neel GRENOBLE (Dr. O. Buisson and W. Guichard), Rutgers University (Prof. M. Gershenson] and discussed with them specific experiments to identify the sources of noise. The noise measurements planned by these groups will provide the information that will pinpoint the origin of all these different noise types in the next few years. We believe we are now at the crucial point in our noise origin and full characterization study.


Descriptors :   *SOURCES , *NOISE , *SUPERCONDUCTORS , TRAPS , NANOSTRUCTURES , LOW FREQUENCY , QUANTUM INFORMATION SCIENCE , FLUX(RATE) , JOSEPHSON JUNCTIONS


Subject Categories : Quantum Theory and Relativity


Distribution Statement : APPROVED FOR PUBLIC RELEASE