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International Conference on Solid State Devices and Materials (SSDM)

Gradiometer using NV center in spatially-isolated equal-quality diamond pair for highly sensitive quantum magnetometers

Katsumi Suzuki, Y. MASUYAMA, Takeshi Ohshima, Takayuki Iwasaki, Mutsuko Hatano

Published Sep 28, 2020• 0 citations
Publisher
DOI
10.7567/ssdm.2020.i-2-06

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A single nitrogen-vacancy (NV) center in diamond is utilized to perform nanoscale magnetic measurements. However, the low contrast and poor collection efficiency of spin-dependent emitted photons limited the instrument sensitivity to approximately several nT/Hz. Here, we design a diamond magnetometer based on a chiral waveguide. We numerically demonstrate that the proposed device achieves a sensitivity of 170 pT/Hz owing to near-unity contrast and efficient photon collection. We also confirm that the device sensitivity is robust against position misalignment and dipole misorientation of an NV center. The proposed approach will enable the construction of a highly-sensitive magnetometer with high spatial resolution.