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There are several important solid-state systems, such as defects in solids,superconducting circuits and molecular qubits, for attractive candidates ofquantum computations. Molecular qubits, which benefit from the power ofchemistry for the tailored and inexpensive synthesis of new systems, face thechallenge from decoherence effect. The decoherence effect is due to themolecular qubits' inevitable interactions to their environment. Strategies toovercome decoherence effect have been developed, such as designing a nuclearspin free environment and working at atomic clock transitions. These chemicalapproaches, however, have some fundamental limitations. For example, chemicalapproach restricts the ligand selection and design to ligands with zero nuclearmagnetic dipole moment, such as carbon, oxygen, and sulfur. Herein, a physicalapproach, named Dynamical decoupling (DD), is utilized to combat decoherence,while the limitations of the chemical approaches can be avoided. The phasememory time $T_2$ for a transition metal complex has been prolonged to exceedone millisecond ($1.4~$ms) by employing DD. The single qubit figure of merit$Q_M $ reaches $ 1.4\times 10^5$, which is $40$ times better than thatpreviously reported value for such system. Our results show that molecularqubits, with milliseconds $T_2$, are promising candidates for quantuminformation processing.

Experimental protection of the coherence of a molecular qubit exceeding a millisecond