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

4:00 PM - 4:15 PM JST(7:00 AM - 7:15 AM UTC)

[11p-E311-10] Narrowband photon-pair generation using a cryogenic Si microring resonator

〇Shouichirou Yasui¹, Xuejun Xu¹, Hidetaka Nishi^2,3, Toshimori Honjo¹, Masaya Hiraishi¹, Haruki Sanada¹, Hiroki Takesue¹ (1.NTT Basic Research Labs., 2.NTT Device Technology Labs., 3.NTT Nanophotonics Center)

Keywords:

Si microring resonator,spontaneous four-wave mixing,narrowband photon-pair generation

We evaluated photon-pair generation via spontaneous four-wave mixing in a cryogenic Si microring resonator toward co-integration with an optical quantum memory. Clear resonances with a linewidth of 320 MHz, comparable to that at room temperature, were observed at 9 K. Coincidence measurements revealed that linewidth broadening of the generated photon pairs was suppressed even at high pump powers, demonstrating the feasibility of narrowband photon-pair generation under cryogenic conditions.