Localization of metal-induced gap states at the metal-insulator interface: Origin of flux noise in SQUIDs and superconducting qubits
Description/Abstract
The origin of magnetic flux noise in Superconducting Quantum Interference Devices with a power spectrum scaling as 1/f (f is frequency) has been a puzzle for over 20 years. This noise limits the decoherence time of superconducting qubits. A consensus has emerged that the noise arises from fluctuating spins of localized electrons with an areal density of 5 x 10(17)m(-2). We show that, in the presence of potential disorder at the metal-insulator interface, some of the metal-induced gap states become localized and produce local moments. A modest level of disorder yields the observed areal density.
| Creator/Author: | Choi, SangKook ; Lee, Dung-Hai ; Louie, Steven G. ; Clarke, John |
|---|---|
| Publication Date: | 2009 Oct 10 |
| OSTI Identifier: | OSTI ID: 979802 |
| Report Number(s): | LBNL-2853E |
| DOE Contract Number: | DE-AC02-05CH11231 |
| Other Number(s): | Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1003392 |
| Resource Type: | Journal Article |
| Resource Relation: | Journal Name: Physical Review Letters |
| Research Org: | Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US) |
| Sponsoring Org: | Materials Sciences Division |
| Subject: | 75; ELECTRONS; MAGNETIC FLUX; ORIGIN; QUBITS; SQUID DEVICES |
| Related Subject: | Magnetic flux noise, SQUIDs, l/f noise |
| Country of Publication: | United States |
| Language: | English |
| Format: | Size: 4 |
| Update Date: | 2010 Jun 21 |
Full Text
1 Mb
View Full Text
or Access Individual Pages
search, view and/or download individual pages
Cite
Select a citation type to copy/paste or download the reference.
