Figure 1
From: Efficient route to high-bandwidth nanoscale magnetometry using single spins in diamond
(a) Scheme of NV structure in diamond lattice. (b) Bloch sphere illustration of Larmor precession ϕ(τ) = ωτ around magnetic field ΔB. (c) Top: Original signal given by Larmor precession typically obtained by Ramsey interferometry16. The total time N = 600 determines the dimension of the basis for compressed sensing; (c) Bottom: Recovered signal by compressive sensing after applying a measurement operator A(K × N) using a subset of K = N/2 random data points with a uniform distribution. (d) Top: Discrete Fourier Transform (DFT) of original signal displaying the frequency sparsity of the input. The appearance of a second peak located at N − ω is a numerical effect due to the periodicity of the DFT; (d) Bottom: Recovered signal via compressive sensing in frequency domain.
