[20p-A404-1~18] 3.9 Optical quantum physics and technologies (formerly 3.10)

△ [20p-A404-18] Realization of a broadband detection method for continuous-valuable optical quantum information by using optical phase sensitive pre-amplification for applying high-speed optical communication technologies

〇ASUKA INOUE¹, TAKAHIRO KASHIWAZAKI¹, TAICHI YAMASHIMA², NAOTO TAKANASHI², TAKUSHI KAZAMA¹, KOJI ENBUTSU¹, KEI WATANABE¹, TAKESHI UMEKI¹, MAMORU ENDO^2,3, AKIRA FURUSAWA^2,3 (1.NTT, 2.Univ. of Tokyo, 3.RIKEN)

Keywords:optical quantum comuputing, optical parametric amplification, PPLN waveguide

In order to realize broadband continuous-valuable optical quantum computer, we demonstrate a broadband quadrature measurement method that can resolve the trade-off between detection efficiency and operation bandwidth by using a broadband optical phase-sensitive amplifier as a preamplifier. In this study, we have succeeded in improving the detection efficiency from 1% to 77% with our periodically polarized lithium niobate (PPLN) waveguides.