Nanoscale magnetometry using a single spin system in diamond

Details Nanoscale magnetometry using a single spin system in diamond Nanoscale magnetometry using a single spin system in diamond

2011-03-24

arxiv.org/abs/1103.4816v1

Phys. Rev. B 83, 125410 (2011)

Physics

Quantum Physics

8 pages and 5 figures

Scientific paper

10.1103/PhysRevB.83.125410

We propose a protocol to estimate magnetic fields using a single nitrogen-vacancy (N-V) center in diamond, where the estimate precision scales inversely with time, ~1/T$, rather than the square-root of time. The method is based on converting the task of magnetometry into phase estimation, performing quantum phase estimation on a single N-V nuclear spin using either adaptive or nonadaptive feedback control, and the recently demonstrated capability to perform single-shot readout within the N-V [P. Neumann et. al., Science 329, 542 (2010)]. We present numerical simulations to show that our method provides an estimate whose precision scales close to ~1/T (T is the total estimation time), and moreover will give an unambiguous estimate of the static magnetic field experienced by the N-V. By combining this protocol with recent proposals for scanning magnetometry using an N-V, our protocol will provide a significant decrease in signal acquisition time while providing an unambiguous spatial map of the magnetic field.

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