Decoherence by electromagnetic fluctuations in double-quantum-dot charge qubits

We discuss decoherence due to electromagnetic fluctuations in charge qubits formed by two lateral quantum dots. We use an effective circuit model to evaluate correlations of voltage fluctuations in the qubit setup. These correlations allows us to estimate energy (T1) and phase (T2) relaxation times...

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Bibliographic Details
Published in:arXiv.org 2010-09
Main Authors: Valente, Diego C B, Mucciolo, Eduardo R, Wilhelm, F K
Format: Article
Language:English
Subjects:
Q factors
Quantum dots
Quantum theory
Qubits (quantum computing)
Variation
Online Access:Get full text
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Summary:We discuss decoherence due to electromagnetic fluctuations in charge qubits formed by two lateral quantum dots. We use an effective circuit model to evaluate correlations of voltage fluctuations in the qubit setup. These correlations allows us to estimate energy (T1) and phase (T2) relaxation times of the the qubit system. Our theoretical estimate of the quality factor due to dephasing by electromagnetic fluctuations yields values much higher than those found in recent experiments, indicating that other sources of decoherence play a dominant role.
ISSN:2331-8422
DOI:10.48550/arxiv.1005.0861