Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing
摘要
As a candidate scheme for controllably coupled qubits, we consider two quantum dots, each doped with a single electron. The spin of the electron defines our qubit basis and trion states can be created by using polarized light; we show that the form of the excited trion depends on the state of the qubit. By using the Luttinger-Kohn Hamiltonian we calculate the form of these trion states in the presence of light-heavy hole mixing, and show that they can interact through both the F\"orster transfer and static dipole-dipole interactions. Finally, we demonstrate that by using chirped laser pulses, it is possible to perform a two-qubit gate in this system by adiabatically following the eigenstates as a function of laser detuning. These gates are robust in that they operate with any realistic degree of hole mixing, and for either type of trion-trion coupling.
引用
@article{arxiv.quant-ph/0505055,
title = {Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing},
author = {Brendon W. Lovett and Ahsan Nazir and Ehoud Pazy and Sean D. Barrett and Tim P. Spiller and G. Andrew D. Briggs},
journal= {arXiv preprint arXiv:quant-ph/0505055},
year = {2007}
}
备注
Updated with published version, references updated