[15p-F205-1~10] NV center in diamond: quantum information, quantum sensing, and bio applications

▼ [15p-F205-10] Probing NV centers using a loop-gap resonator

〇(D)Jason Ball¹, Yu Yamashiro^3,1, Yuimaru Kubo^1,2, Denis Konstantinov¹ (1.OIST, 2.JST-PRESTO, 3.Univ. of Ryukyus)

Keywords:hybrid quantum systems, electron spin resonance, quantum information

Color centers in diamond, specifically nitrogen vacancy (NV) centers, have become a popular choice in hybrid quantum devices because of their optical properties and long spin coherence times. We designed and tested a microwave loop-gap resonator to measure electron spin resonance (ESR) and the spin-cavity coupled state dynamics in NV centers at dilution temperatures. When the spin ensemble and the cavity are on resonance (~5 GHz) we observe a normal mode splitting, demonstrating strong coupling between the cavity and the ensemble. Using spin echo measurements, we also determined the spin relaxation and coherence times, T₁ and T₂ of the NV centers at 10 mK. Lastly, we discuss the applications of our system in SiV centers, including coherent microwave-to-optical conversion of photons.