Presentation Information

5:30 PM - 5:45 PM JST(8:30 AM - 8:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9p-F212-15]Investigation of Noise Reduction in Optomechanical Crystals for Quantum Transducers

〇Daisuke Ito¹, Yuhei Sekiguchi^1,2,5, Hyuga Oka³, Byunggi Kim⁴, Michele Diego³, Keitaro Aoyama¹, Rikuma Gonda¹, Ryutaro Miyata¹, Hodaka Kurokawa^2,3,5, Masahiro Nomura^2,3,5, Hideo Kosaka^1,2,5 (1.Grad. Sch. Eng., Yokohama Natl. Univ., 2.QIC, Yokohama Natl. Univ., 3.IIS Univ. of Tokyo, 4.Science Tokyo, 5.IAS, Yokohama Natl. Univ.)

Keywords:

optomechanical crystals,quantum transducer,Silicon

Quantum transducers are essential for connecting superconducting qubits to optical fibers. While silicon optomechanical crystals are promising, increased thermal phonons from strong optical excitation raise concerns about added noise. To evaluate these limits, we fabricated silicon optomechanical crystals and analyzed their optical properties' dependence on excitation intensity. Low-power measurements confirmed a high optical quality factor (Q=1.4 x10⁵) and the resolved-sideband condition for a 5 GHz mechanical mode. However, higher input laser powers caused a distinct increase in the optical linewidth, demonstrating that additional optical loss and heating are severe obstacles to low-noise performance. Based on these findings, we will discuss required conversion efficiency and noise constraints. Finally, we will compare silicon with alternative materials like diamond, which offers reduced optical absorption, to propose guidelines for low-noise quantum transducers.

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