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Microelectronics Journal

Effect of quantum dot shape on dynamical dephasing suppression in exciton qubits under applied electric field

Thomas E. Hodgson, Lorenza Viola, Irene D’Amico

Published Jul 28, 2008• 0 citations
Publisher
DOI
10.1016/j.mejo.2008.06.016

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Communications in Theoretical Physics•Mar 1, 2009•0 citations
We investigate the usefulness and viability of the scheme developed by Viola and Lloyd [Phys. Rev. A 58, 2733 (1998)] to control dephasing in the context of exciton-based quantum computation with self-assembled quantum dots. We demonstrate that optical coherence of a confined exciton qubit exposed to phonon-induced dephasing can be substantially enhanced through the application of a simple periodic sequence of control pulses. The shape of the quantum dot has a significant effect on the dephasing properties. Remarkably, we find that quantum dots with parameters optimized for implementing quantum computation are among the most susceptible to dephasing, yet periodic decoupling is most efficient for exactly that type of dot. We also show that the presence of an electric field, which is a necessary ingredient for many exciton-based quantum computing schemes, may further increase the control efficiency. Our results suggest that dynamical decoupling may be a method of choice for robust storage of exciton qubits during idle stages of quantum algorithms.
We quantitatively investigate the usefulness and viability of the scheme developed by Viola and Lloyd [Phys. Rev. A 58, 2733 (1998)] to control dephasing in the context of exciton-based quantum computation with self-assembled quantum dots. We demonstrate that optical coherence of a confined exciton qubit exposed to phonon-induced dephasing can be substantially enhanced through the application of a simple periodic sequence of control pulses. The shape of the quantum dot has a significant effect on the dephasing properties. Remarkably, we find that quantum dots with parameters optimized for implementing quantum computation are among the most susceptible to dephasing, yet periodic decoupling is most efficient for exactly that type of dot. We also show that the presence of an electric field, which is a necessary ingredient for many exciton-based quantum computing schemes, may further increase the control efficiency. Our results suggest that dynamical decoupling may be a method of choice for robust storage of exciton qubits during idle stages of quantum algorithms.
In a two-dimensional quantum dot (QD) with parabolic confinement potential, we investigate pure dephasing due to deformation potential exciton-bulk longitudinal acoustic phonons (LAP) interaction for exciton qubits under the influence of external static electric and magnetic fields by adopting the full quantum-mechanical method of Kunihiro Kojima and Akihisa Tomita. The wave function is found and the dependence of the pure dephasing factor on the confinement length of the QD and time and temperature is discussed. We find the external electric and magnetic fields have important effects on pure dephasing of exciton qubits because exciton-LAP interaction increases, leading to more pure dephasing.