We observe coherent spin exchange between identical electronic spins in the solid state, a key step towards full quantum control of electronic spin registers in room temperature solids. In a diamond substrate, a single nitrogen vacancy (NV) center coherently couples to two adjacent $S=1/2$ dark electron spins via the magnetic dipolar interaction. We quantify NV-electron and electron-electron couplings via detailed spectroscopy, with good agreement to a model of strongly interacting spins. The electron-electron coupling enables an observation of coherent flip-flop dynamics between electronic spins in the solid state, which occur conditionally on the state of the NV. Finally, as a demonstration of coherent control, we selectively couple and transfer polarization between the NV and the pair of electron spins. Our observations enable the realization of fast quantum gate operations and quantum state transfer in a scalable, room temperature, quantum processor.

中文翻译：

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固体中电子自旋团簇的相干动力学传感

我们观察到固态相同电子自旋之间的相干自旋交换，这是朝着室温固体中的电子自旋寄存器进行完全量子控制的关键一步。在金刚石基底中，单个氮空位（NV）中心连贯地耦合到两个相邻的氮原子$\mathrm{小号}=\mathrm{1个}/\mathrm{2个}$暗电子通过磁偶极相互作用旋转。我们通过详细的光谱学量化了NV-电子和电子-电子耦合，并与强相互作用自旋的模型很好地吻合。通过电子-电子耦合，可以观察固态电子自旋之间的相干触发器动力学，该动力学自发地发生在NV的状态上。最后，作为相干控制的演示，我们在NV和一对电子自旋之间选择性地耦合和转移了极化。我们的观察结果使我们能够在可扩展的室温量子处理器中实现快速的量子门操作和量子状态转移。