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Phys. Rev. B 82, 125302 (2010) [12 pages]

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

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Diego C. B. Valente1, Eduardo R. Mucciolo2, and F. K. Wilhelm3
1Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
2Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA
3Institute of Quantum Computation, Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

Received 5 May 2010; published 3 September 2010

We discuss decoherence due to electromagnetic fluctuations in charge qubits formed by two lateral quantum dots. We use 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 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.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.82.125302
DOI:
10.1103/PhysRevB.82.125302
PACS:
73.21.La, 03.67.Lx, 73.23.Hk
 
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