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Theory of semiconductor quantum-wire-based single- and two-qubit gates (Articolo in rivista)

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Theory of semiconductor quantum-wire-based single- and two-qubit gates (Articolo in rivista) (literal)

Anno

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Alternative label

Tobias Zibold and Peter Vogl and Andrea Bertoni (2007)
Theory of semiconductor quantum-wire-based single- and two-qubit gates
in Physical review. B, Condensed matter and materials physics
(literal)

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Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany; INFM, CNR, Natl Res Ctr Nanostruct & Biosyst Surfaces S3, I-41100 Modena, Italy NANO - Istituto Nanoscienze (literal)

Titolo

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

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 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. (literal)

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