Dissipative dynamics of coupled quantum dots under quantum measurement

Abstract

We have studied the dissipative dynamics of a solid-state qubit with an extra electron confined to either one of two coupled quantum dots. Previous theoretical work based on Bloch-type rate equations gave an unphysical uniform occupation probability of the electron in the quantum dots even for non-identical dots. We show that this is due to neglecting higher order interactions in the analysis. By including higher order terms, we obtain expected asymmetric occupation probabilities for non-identical dots. Our work demonstrates that the high order interaction terms can lead to important qualitative impacts on the operation of the qubit.

9 pages, 2 figures

References in corpus (4)

• Measurement induced quantum-classical transition
• Relaxation and Zeno effect in qubit measurements
• Entanglement spectroscopy of a driven solid-state qubit and its detector
• Quantum measurement of a solid-state qubit: A unified quantum master equation approach revisited

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