Open AccessHigh-sensitivity double-quantum magnetometry in diamond via quantum control
Author(s) -
Dong Yang,
Hao-Bin Lin,
Wei Zhu,
Fang-Wen Sun
Publication year - 2022
Publication title -
zhongguo kexue jishu daxue xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.13
H-Index - 10
ISSN - 0253-2778
DOI - 10.52396/justc-2021-0249
Subject(s) - magnetometer , quantum sensor , sensitivity (control systems) , diamond , qubit , physics , spin (aerodynamics) , nitrogen vacancy center , magnetic field , coupling (piping) , quantum , signal (programming language) , condensed matter physics , materials science , quantum information , electronic engineering , quantum network , quantum mechanics , computer science , engineering , metallurgy , composite material , thermodynamics , programming language
High-fidelity quantum operation of qubits plays an important role in magnetometry based on nitrogen-vacancy (NV) centers in diamonds. However, the nontrivial spin-spin coupling of the NV center decreases signal contrast and sensitivity. Here, we overcome this limitation by exploiting the amplitude modulation of microwaves, which allows us to perfectly detect magnetic signals at low fields. Compared with the traditional double-quantum sensing protocol, the full contrast of the detection signal was recovered, and the sensitivity was enhanced three times in the experiment. Our method is applicable to a wide range of sensing tasks, such as temperature, strain, and electric field.