Theory of semiconductor quantum-wire-based single- and two-qubit gates

Tobias Zibold, Peter Vogl, Andrea Bertoni

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


A GaAs AlGaAs based two-qubit quantum device that allows the controlled generation and straightforward detection of entanglement by measuring a stationary current-voltage characteristics 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 nonperturbatively. 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.

Original languageEnglish
Article number195301
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
StatePublished - 1 Nov 2007


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