Established quantum-computing platforms, such as superconducting circuits and ion traps, suffer from problems related to error mitigation and correction. These issues could be avoided by using a quantum processor in which the usual two-level computational units (qubits) are replaced with multilevel units (qudits). Now Stefano Carretta at the University of Parma in Italy and his colleagues propose a design for such a processor that uses qudits made from molecular spins [1]. The researchers lay out methods to implement elementary qudit operations in their processor and to read out the computational output.
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