Dielectric microwave resonator with large optical apertures for spin-based quantum devices

• URL: http://arxiv.org/abs/2403.08458v1
• Date: Wed, 13 Mar 2024 12:18:37 GMT
• Title: Dielectric microwave resonator with large optical apertures for spin-based quantum devices
• Authors: Tatsuki Hamamoto, Amit Bhunia, Rupak Kumar Bhattacharya, Hiroki Takahashi, Yuimaru Kubo
• Abstract summary: Microwave resonator with internal quality factor of $2.30times104$ accommodated optical apertures with a diameter of $8, mathrmmm$. We performed both continuous-wave (cw) and pulse electron spin resonance (ESR) spectroscopy on 2,2-diphenyl-1-picrylhydrazyl (DPPH) crystalline powder and P1 centers in a diamond crystal in a dilution refrigerator.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Towards a spin-based quantum microwave-optical photon transducer, we demonstrate a low-loss dielectric microwave resonator with an internal quality factor of $2.30\times10^4$ while accommodating optical apertures with a diameter of $8\, \mathrm{mm}$. The two seemingly conflicting requirements, high quality factor and large optical apertures, are satisfied thanks to the large dielectric constant of rutile ($\mathrm{TiO_2}$). The quality factor is limited by radiation loss, and we confirmed by numerical simulation that this dielectric resonator can achieve a quality factor exceeding $10^6$ by extending the height of the resonator enclosure. Using this resonator, we performed both continuous-wave (cw) and pulse electron spin resonance (ESR) spectroscopy on 2,2-diphenyl-1-picrylhydrazyl (DPPH) crystalline powder and P1 centers in a diamond crystal in a dilution refrigerator. The cw ESR spectroscopy demonstrated high-cooperativity and strong spin-resonator coupling with the DPPH and P1 centers respectively, while the pulse ESR spectroscopy successfully measured longitudinal and transverse relaxation times.

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