Hyperfine-induced decoherence in triangular spin-cluster qubits

Abstract

We investigate hyperfine-induced decoherence in a triangular spin-cluster for different qubit encodings. Electrically controllable eigenstates of spin chirality (C_z) show decoherence times that approach milliseconds, two orders of magnitude longer than those estimated for the eigenstates of the total spin projection (S_z) and of the partial spin sum (S_{12}). The robustness of chirality is due to its decoupling from both the total- and individual-spin components in the cluster. This results in a suppression of the effective interaction between C_z and the nuclear spin bath.

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• Anisotropic g factor in InAs self-assembled quantum dots
• Toroidal magnetic molecules stripped to their basics
• Observation of spin-electric transitions in a molecular exchange qubit
• Manipulation of spin cluster qubits by electric-field induced modulation of exchange coupling, $g$-factor, and axial anisotropy
• On the size of linear superpositions in molecular nanomagnets
• Quantum Information Processing with Molecular Nanomagnets: an introduction
• Studies of decoherence in strongly anisotropic spin triangles with toroidal or general non-collinear easy axes
• Mitigating decoherence in molecular spin qudits
• Polarization dependence of spin-electric transitions in molecular exchange qubits