Decoherence in a superconducting quantum bit circuit
Abstract
Decoherence in quantum bit circuits is presently a major limitation to their use for quantum computing purposes. We present experiments, inspired from NMR, that characterize decoherence in a particular superconducting quantum bit circuit, the quantronium. We introduce a general framework for the analysis of decoherence, based on the spectral densities of the noise sources coupled to the qubit. Analysis of our measurements within this framework indicates a simple model for the noise sources acting on the qubit. We discuss various methods to fight decoherence.
- Publication:
-
Physical Review B
- Pub Date:
- October 2005
- DOI:
- arXiv:
- arXiv:cond-mat/0508588
- Bibcode:
- 2005PhRvB..72m4519I
- Keywords:
-
- 74.78.-w;
- 85.25.Cp;
- 85.25.Am;
- 03.65.Yz;
- Superconducting films and low-dimensional structures;
- Josephson devices;
- Superconducting device characterization design and modeling;
- Decoherence;
- open systems;
- quantum statistical methods;
- Condensed Matter - Superconductivity;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- Long paper. 65 pages, 18 Figures