Abstract
Spin defects in solids (e.g. diamond) have been widely used for quantum sensing of temperature and magnetic fields. The recent discovery of spin qubits in hexagonal boron nitride (hBN), a van der Waals material, provides new opportunities for quantum sensing. For example, spin qubits in hBN will be particularly suitable for studying 2D magnetic materials. However, the brightness and the contrast of boron vacancy spin defects in hBN are relatively low, which limit their applications in quantum sensing. Recently, we created spin defects in hBN by both femtosecond laser writing [ACS Photonics, 8, 994 (2021)] and ion implantation, and enhanced the brightness of hBN spin defects by a factor of 17 with gold surface plasmons [Nano Letters, 21, 7708 (2021)]. We also observed a record-high contrast of the optically detected magnetic resonance (ODMR) of hBN spin defects at room temperature. Our work show hBN spin defects are promising for quantum sensing.
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