Theory of semiconductor quantum-wire based single- and two-qubit gates
Abstract
A GaAs/AlGaAs based two-qubit quantum device that allows the controlled generation and straightforward detection of entanglement by measuring a stationary current-voltage characteristic is proposed. We have developed a two-particle Green's function method of open systems and calculate the properties of three-dimensional interacting entangled systems non-perturbatively. We present concrete device designs and detailed, charge self-consistent predictions. One of the qubits is an all-electric Mach-Zehnder interferometer that consists of two electrostatically defined quantum wires with coupling windows, whereas the second qubit is an electrostatically defined double quantum dot located in a second two-dimensional electron gas beneath the quantum wires. We find that the entanglement of the device can be controlled externally by tuning the tunneling coupling between the two quantum dots.
Cite
@article{arxiv.0710.3572,
title = {Theory of semiconductor quantum-wire based single- and two-qubit gates},
author = {Tobias Zibold and Peter Vogl and Andrea Bertoni},
journal= {arXiv preprint arXiv:0710.3572},
year = {2010}
}
Comments
16 pages, 13 figures, RevTex4 two-column format, to appear in Phys. Rev. B