Diamond Materials

Diamond Materials for Quantum Application

23. September 2014: The DFG research group FOR 1493 “Diamond Materials and Quantum Applications” goes into its second funding period. FOR1493 is a national research consortium funded by the Deutsche Forsch-ungsgemeinschaft.

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ERC Advanced Grant


Bath Spins as a resource for quantum registers

13C nuclear spins coupled to an NV center are a valuable resource for realizing long lived solid state quantum registers. However, the number of nuclear spins that are addressable is limited by the inhomogeneous linewidth of the magnetic resonance transition, which is in turn limited by the nuclear spin bath. If we could address a nuclear spin that is hidden in the broadened resonance line - i.e. the hyperfine coupling is much smaller than the inhomogeneous linewidth - the number of addressable nuclear spins would greatly increase. In this work we demonstrate that this is possible by dynamically decoupling the electron spin from the surrounding nuclear spin bath. By carefully tuning the direction and strength of an applied magnetic field, the electron spin couples selectively only to specific bath spins. Thereby, we can map out the otherwise hidden nuclear spins around an NV center. Using isotopically enriched diamond (99.99% 12C), our method is capable of detecting nuclear spins coupled as weak as 300 Hz.