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The nuclear spin state of a phosphorus donor ($^{31}$P) in isotopicallyenriched silicon-28 is an excellent host to store quantum information in thesolid state. The spin's insensitivity to electric fields yields a solid-statequbit with record coherence times, but also renders coupling to other quantumsystems very challenging. Here, we describe how to generate a strong electricdipole ($>100$ Debye) at microwave frequencies for the nuclear spin. This isachieved by applying a magnetic drive to the spin of the donor-bound electron,while simultaneously controlling its charge state with electric fields. Undercertain conditions, the microwave magnetic drive also renders the nuclear spinresonance frequency and electric dipole strongly insensitive to electricalnoise, yielding long ($>1$ ms) dephasing times and robust gate operations. Thenuclear spin could then be strongly coupled to microwave resonators, with avacuum Rabi splitting of order 1 MHz, or to other nuclear spins, nearly half amicrometer apart, via strong electric dipole-dipole interaction. This workbrings the $^{31}$P nuclear qubit into the realm of hybrid quantum systems andopens up new avenues in quantum information processing.

Robust electric dipole transition at microwave frequencies for nuclear spin qubits in silicon