Fig. 2: Demonstration of parallel imaging on single NV centers.

a Widefield fluorescence image of single NV centers for defining the real-space coordinate system. The ___location of B_E = 0 (see Supplementary Fig. 3) is defined as the origin of real space (the yellow pentagram), and the direction of the gradient of the phase encoding magnetic field is defined as the x and y directions of the coordinate system (the yellow arrows in the x and y directions). The distance between NV1, NV2 and the origin is measured and listed in this image. The scale bar is 2 μm. b k-space data and (c) the corresponding real-space data of NV1 in the x direction in Fourier imaging with reduced FOV of 2.22 μm. d, f, h, j Extended full FOV for the real-space data (black line) of NV1 and NV2 in the x and y direction, respectively. The pixel-sensitive area along with the distance between NV1 and the origin are used as the width and central position of a spatial filter (blue pentagram and shaded area formed by blue dashed line) to select the actual signal (red triangle). e, g, i, k x and y ___location measurement of NV1 and NV2 is achieved by fitting the original data using the Gaussian function, with the central position of x₁ = 16.36 ± 0.01 μm, y₁ = 2.04 ± 0.01 μm, x₂ = 5.85 ± 0.03 μm, y₂ = −1.77 ± 0.03 μm. The FWHM of each curve is shown on the upper right corner.