title: Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4.
abstract: We report the generation of a continuous-wave squeezed vacuum resonant on the Rb D1 line (795 nm) using periodically poled KTiOPO4 (PPKTP) crystals. With a frequency doubler and an optical parametric oscillator based on PPKTP crystals, we observed a squeezing level of -2.75+/-0.14 dB and an antisqueezing level of +7.00+/-0.13 dB. This system could be utilized for demonstrating storage and retrieval of the squeezed vacuum, which is important for the ultraprecise measurement of atomic spins as well as quantum information processing.
authors.affiliation: Department of Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan. kozuma@ap.titech.ac.jp
authors.forename: Takahito
authors.initials: T
authors.lastname: Tanimura
authors.forename: Daisuke
authors.initials: D
authors.lastname: Akamatsu
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Yokoi
authors.forename: Akira
authors.initials: A
authors.lastname: Furusawa
authors.forename: Mikio
authors.initials: M
authors.lastname: Kozuma