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Journal Article

Protecting a Diamond Quantum Memory by Charge State Control

MPS-Authors

Grüneis,  A.
Max Planck Society;

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Citation

Pfender, M., Aslam, N., Simon, P., Antonov, D., Thiering, G., Burk, S., et al. (2017). Protecting a Diamond Quantum Memory by Charge State Control. Nano Letters, 17(10), 5931-5937.


Cite as: https://hdl.handle.net/21.11116/0000-000E-D020-2
Abstract
In recent years, solid-state spin systems have emerged as promising candidates for quantum information processing. Prominent examples are the nitrogen-vacancy (NV) center in diamond, phosphorus dopants in silicon (Si:P), rare-earth ions in solids, and V-si-centersin silicon-carbide. The Si:P system has demonstrated that its nuclear spins can yield exceedingly long spin coherence times by eliminating the electron spin of the dopant. For NV centers, however, a proper charge state for storage of nuclear spin qubit coherence has not been identified yet. Here, we identify and characterize the positively charged NV center as an electron spin-less and optically inactive state by utilizing the nuclear spin qubit as a probe. We control the electronic charge and spin utilizing nanometer scale gate electrodes. We achieve a lengthening of the nuclear spin coherence times by a factor of 4. Surprisingly, the new charge state allows switching of the optical response of single nodes facilitating full individual addressability.