[11p-E311-1~11] 3.9 Optical quantum physics and technologies

1:30 PM - 1:45 PM JST(4:30 AM - 4:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[11p-E311-1] High-efficiency demultiplexer using a virtually imaged phased array toward single-shot high-resolution single-photon spectroscopy

〇Kazuki Idezawa¹, Yuki Nagoro¹, Akira Ozawa^1,2, Tomoyuki Horikiri^1,2 (1.Grad. Sch. Eng., Yokohama Natl. Univ., 2.IMS, Yokohama Natl. Univ.)

Keywords:

virtually imaged phased array,quantum internet,quantum repeater

Toward single-shot, high-resolution spectroscopy of single photons for frequency-multiplexed quantum repeaters, we constructed a high-efficiency frequency demultiplexer based on a virtually imaged phased array (VIPA), capable of resolving frequency components separated by 120 MHz. In a VIPA-based demultiplexer, sufficient spatial separation for such a narrow frequency interval requires a lens with a long focal length. However, the resulting increase in the focused spot size leads to fiber-coupling loss. To address this issue, we introduced a two-stage focusing system incorporating a microlens array, thereby achieving high-efficiency coupling while maintaining the spectroscopic performance.