Coherent control of a nitrogen-vacancy center spin ensemble with a diamond mechanical resonator

Published on 2017-04-26T18:56:31Z (GMT) by
Coherent control of the nitrogen-vacancy (NV) center in diamond’s triplet spin state has traditionally been accomplished with resonant ac magnetic fields. Here, we show that high-frequency stress resonant with the spin state splitting can also coherently control NV center spins. Because this mechanical drive is parity non-conserving, controlling spins with stress enables direct access to the magnetically forbidden |−1〉↔|+1〉 spin transition. Using a bulk-mode mechanical microresonator fabricated from single-crystal diamond, we apply intense ac stress to the diamond substrate and observe mechanically driven Rabi oscillations between the |−1〉 and |+1〉 states of an NV center spin ensemble. Additionally, we measure the inhomogeneous spin dephasing time (T2*) of the spin ensemble within this {−1,+1} subspace using a mechanical Ramsey sequence and compare it to the dephasing times measured with a magnetic Ramsey sequence for each of the three spin qubit combinations available within the NV center ground state. These results demonstrate coherent control of a spin with a mechanical resonator and could lead to the creation of a phase-sensitive Δ-system inside the NV center ground state with potential applications in quantum optomechanics and metrology.

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MacQuarrie, E. R.; Gosavi, T. A.; Moehle, A. M.; Jungwirth, N. R.; Bhave, S. A.; Fuchs, G. D. (2015): Coherent control of a nitrogen-vacancy center spin ensemble with a diamond mechanical resonator. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.3755903.v1