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The decoherence of a central electron spin due to the dynamics of a coupledelectron-spin bath is a core problem in solid-state spin physics. Ensembleexperiments have studied the central spin coherence in detail, but suchexperiments average out the underlying quantum dynamics of the bath. Here, weshow the coherent back-action of an individual NV center on an electron-spinbath and use it to detect, prepare and control the dynamics of a pair of bathspins. We image the NV-pair system with sub-nanometer resolution and reveal along dephasing time ($T_2^* = 44(9)$ ms) for a qubit encoded in theelectron-spin pair. Our experiment reveals the microscopic quantum dynamicsthat underlie the central spin decoherence and provides new opportunities forcontrolling and sensing interacting spin systems.

Control of individual electron-spin pairs in an electron-spin bath