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 (Cz) show decoherence times that approach milliseconds, two orders of magnitude longer than those estimated for the eigenstates of the total spin projection (Sz) and of the partial spin sum (S12). 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 Cz and the nuclear spin bath.
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