Controllable anisotropic exchange coupling between spin qubits in quantum dots

Yun Pil Shim, Sangchul Oh, Xuedong Hu, Mark Friesen

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Abstract

The exchange coupling between quantum dot spin qubits is isotropic, which restricts the types of quantum gates that can be formed. Here, we propose a method for controlling anisotropic interactions between spins arranged in a bus geometry. The symmetry is broken by an external magnetic field, resulting in XXZ-type interactions that can efficiently generate maximally entangled Greenberger-Horne-Zeilinger states or universal gate sets for exchange-only quantum computing. We exploit the XXZ couplings to propose a qubit scheme, based on double dots.

Original languageEnglish
Article number180503
JournalPhysical Review Letters
Volume106
Issue number18
DOIs
Publication statusPublished - 6 May 2011

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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