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Decoherence and 1/f noise in Josephson qubits.
1NEST-INFM & Dipartimento di Metodologie Fisiche e Chimiche (DMFCI), Università di Catania, viale A. Doria 6, 95125 Catania, Italy.
Physical Review Letters
|June 13, 2002
Summary
We developed a model for dephasing caused by bistable fluctuators, explaining Josephson qubit decoherence from background charges and 1/f noise. This model reveals unique features, especially for slowly moving charges.
Area of Science:
- Quantum computing
- Condensed matter physics
Background:
- Decoherence limits quantum computation.
- Josephson qubits are sensitive to environmental noise, particularly 1/f noise from background charges.
Purpose of the Study:
- To model dephasing in Josephson qubits caused by bistable fluctuator environments.
- To analyze the impact of discrete environmental charges on qubit decoherence.
Main Methods:
- Development of a theoretical model for dephasing.
- Analysis of qubit decoherence induced by background charge fluctuations.
- Exact solution of the dephasing model away from degeneracy.
Main Results:
- The model captures dephasing due to bistable fluctuators.
- Identified new decoherence features in Josephson qubits.
- Highlighted the role of slowly moving charges in pronounced dephasing effects.
Conclusions:
- The proposed model provides insights into qubit decoherence mechanisms.
- Understanding dephasing from discrete environmental charges is crucial for improving qubit stability.
- The model offers an exact solution under specific conditions, aiding further research.