Experimental evidence for a surface distribution of two-level systems in superconducting lithographed microwave resonators
- 14 April 2008
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 92 (15), 152505
- https://doi.org/10.1063/1.2906373
Abstract
We present measurements of the temperature-dependent frequency shift of five niobium superconducting coplanar waveguide microresonators with center strip widths ranging from 3 to 50 μ m , taken at temperatures in the range of 100 – 800 mK , far below the 9.2 K transition temperature of niobium. These data agree well with the two-level system (TLS) theory. Fits to this theory provide information on the number of TLSs that interact with each resonator geometry. The geometrical scaling indicates a surface distribution of TLSs and the data are consistent with a TLS surface layer thickness of the order of a few nanometers, as might be expected for a native oxide layer.Keywords
Other Versions
This publication has 18 references indexed in Scilit:
- Noise and Sensitivity of Aluminum Kinetic Inductance Detectors for Sub-mm AstronomyJournal of Low Temperature Physics, 2008
- Recent Results of a New Microwave SQUID MultiplexerJournal of Low Temperature Physics, 2008
- Demonstration of a multiplexer of dissipationless superconducting quantum interference devicesApplied Physics Letters, 2008
- Superconducting kinetic inductance detectors for astrophysicsMeasurement Science and Technology, 2007
- Coherent quantum state storage and transfer between two phase qubits via a resonant cavityNature, 2007
- Decoherence in Josephson Qubits from Dielectric LossPhysical Review Letters, 2005
- Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamicsNature, 2004
- A broadband superconducting detector suitable for use in large arraysNature, 2003
- Nanoscale radio-frequency thermometryApplied Physics Letters, 2003
- Multiplexable kinetic inductance detectorsAIP Conference Proceedings, 2002