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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 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.

preprint2010arXivOpen access
Diego C. B. ValenteEduardo R. MuccioloF. K. Wilhelm
cond-mat.mes-hallquant-ph
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Diego C. B. ValenteEduardo R. MuccioloF. K. Wilhelm

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