Strongly Coupled Diamond Spin Qubits by Molecular Nitrogen Implantation
Abstract
Ionized nitrogen molecules (15N2+) are used as efficient point sources for creating NV- pairs in diamond with nanoscale spatial separation and up to 55 kHz magnetic coupling strength. Co-implantation of 12C+ increased the yield of pairs, and a 13C-depleted diamond allowed 0.65 ms coherence times to be obtained. Further coupling to a third dark spin provided a strongly coupled three spin register. These results mark an important step towards realization of multi-qubit systems and scalable NV- quantum registers.
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