Controllable anisotropic exchange coupling between spin qubits in quantum dots |
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Authors: | Shim Yun-Pil Oh Sangchul Hu Xuedong Friesen Mark |
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Institution: | Department of Physics, University of Wisconsin–Madison, 53706, USA. |
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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. |
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