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Nitrogen-Vacancy (NV) centers in diamonds provide a room-temperature platformfor various emerging quantum technologies, e.g. the long nuclear spin coherencetimes as potential quantum memory registers. We demonstrate a freezing protocolfor an NV center to isolate its intrinsic nuclear spin from a noisyelectromagnetic environment. Any initial state of the nuclear spin can befrozen when the hyperfine-coupled electron and nuclear spins are simultaneouslydriven with unequal Rabi frequencies. Through numerical simulations, we showthat our protocol can effectively shield the nuclear spin from strong drive ornoise fields. We also observe a clear suppression of quantum correlations inthe frozen nuclear spin regime by measuring the quantum discord of theelectron-nuclear spin system. These features can be instrumental in extendingthe storage times of NV nuclear-spin based quantum memories in hybrid quantumsystems.

Decoupling Nuclear Spins via Interaction-Induced Freezing in Nitrogen Vacancy Centers in Diamond