The authors derive that an optimized GHZ state of probe spins gives a z^{3/4}/ρ^{3/4} scaling for single spin detection, much better than the single-spin or separable-ensemble scalings, and use it to claim sub-second detection times.
High-resolution mag- netometry with a spinor Bose-Einstein condensate
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Single Spin Detection with Entangled States
The authors derive that an optimized GHZ state of probe spins gives a z^{3/4}/ρ^{3/4} scaling for single spin detection, much better than the single-spin or separable-ensemble scalings, and use it to claim sub-second detection times.