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Bulletin of the American Physical Society

Universal Set of Quantum Gates for Double-Dot Exchange-Only Spin Qubits Under Realistic Conditions

Marco De Michielis, Elena Ferraro, Davide Rotta, Giovanni Mazzeo, M. L. V. Tagliaferri, Alessandro Crippa, Marco Fanciulli, Enrico Prati

Published Mar 4, 2014• 0 citations
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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.