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Molecular-Spin-Qubit Noise Spectroscopy Through Dynamical Decoupling

With the power of chemistry for inexpensive synthesis of tailored systems, molecular qubits are attractive candidates for quantum computing. Here decoherence persists as a major obstacle; for its effective suppression, the properties of environmental noise must be elucidated. Traditional noise spectroscopy with spurious harmonics leads to false identification of nuclear spins. The authors demonstrate a protocol for noise-spectrum analysis without spurious harmonics, through dynamical decoupling. This result enables enhanced coherence for molecular qubits, and could be quite significant for quantum information processing based on such systems.