Coupling spin defects in hexagonal boron nitride to a microwave cavity

Author:

Tran Thinh N.1ORCID,Gale Angus1,Whitefield Benjamin12,Dyakonov Vladimir3,Toth Milos12,Aharonovich Igor12ORCID,Kianinia Mehran1ORCID

Affiliation:

1. School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney 1 , Ultimo, New South Wales 2007, Australia

2. ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), University of Technology Sydney 2 , Ultimo, New South Wales 2007, Australia

3. Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg 3 , Würzburg, Germany

Abstract

Optically addressable spin defects in hexagonal boron nitride (hBN) have become a promising platform for quantum sensing. While sensitivity of these defects is limited by their interactions with the spin environment in hBN, inefficient microwave delivery can further reduce their sensitivity. Here, we design and fabricate a microwave double arc resonator for efficient transferring of the microwave field at 3.8 GHz. The spin transitions in the ground state of VB− are coupled to the frequency of the microwave cavity, which result in enhanced optically detected magnetic resonance (ODMR) contrast. In addition, the linewidth of the ODMR signal further reduces, achieving a magnetic field sensitivity as low as 42.4 μT/√Hz. Our robust and scalable device engineering is promising for future employment of spin defects in hBN for quantum sensing.

Funder

Australian Research Council

Office of Naval Research Global

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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