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Phonon Effects on the Weak Measurement of Charge States in Quantum Dots with a Quantum Point Contact

100%
Marcinowski Ł., Krzyżosiak M.
Acta Physica Polonica A
|
2011
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vol. 119
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issue 5
640-643
EN
We study theoretically the process of a weak measurement of charge states in a double quantum dot performed by coupling to a quantum point contact. We focus on the interplay of the measurement process with phonon-induced dephasing of delocalized superpositions of electron states and compare the time scales relevant for the dynamics of the open system and for the measurement process: the decoherence rate, the localization rate of the state conditioned on the measurement outcome and the time scale on which information on the system state is gained in the process of the measurement.
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Singlet-Triplet Dephasing in Asymmetric Quantum Dot Molecules

81%
Marcinowski Ł., Roszak K., Machnikowski P.
Acta Physica Polonica A
|
2009
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vol. 116
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issue 5
874-876
EN
We discuss pure dephasing of singlet-triplet superpositions in two-electron double quantum dots due to elastic phonon scattering. We generalize our previous results to a system built of two non-identical dots. We show that the asymmetry must be very strong in order to considerably affect the dephasing rate.
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