title: Photon number squeezing of ultrabroadband laser pulses generated by microstructure fibers.
abstract: To the best of our knowledge, we demonstrate for the first time the generation of photon number squeezing by spectral filtering for ultrabroadband light generated by microstructure fibers at 800 nm. A maximum squeezing of 4.6 dB is observed, corresponding to 10.3 dB after correcting for detection losses. We numerically analyzed the quantum dynamics of ultrashort laser pulse propagation through optical fibers by solving a nonlinear quantum Schrödinger equation that included Raman scattering, especially for the quantum correlation of photon number fluctuation among frequency modes in broadband pulses.
authors.affiliation: Department of Electronics and Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Hirosawa
authors.forename: Hiroto
authors.initials: H
authors.lastname: Furumochi
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tada
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Kannari
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takeoka
authors.forename: Masahide
authors.initials: M
authors.lastname: Sasaki