[C-6] Quantum Computing IV

[C-6-07] Broadband microwave surface loop-gap resonator for quantum sensors using nitrogen-vacancy centers in diamond

〇Toyofumi Ishikawa¹, Yasunori Mawatari¹, Satoshi Kashiwaya^1,2, Akio Yoshizawa¹, Hideyuki Watanabe¹ (1. National Institute of Advanced Industrial Science and Technology (AIST) (Japan), 2. Nagoya Univ. (Japan))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.C-6-07

Quantum sensors based on nitrogen-vacancy (NV) centers in diamond are expected to be a powerful probe for detecting magnetism and nuclear spins at the nanometer scale. Various applications with NV quantum sensors require a uniform microwave (MW) magnetic field. Here, we report on a surface loop-gap resonator that generates a uniform MW field within an area of 7 mm2. Its bandwidth is more than 100 MHz; thus, multiple resonances of spin states can be addressed. The bandwidth can be modified by adjusting the capacitance between the resonator and a microstrip line.