Photon-Number Squeezed Pulse Generation with Symmetric Fiber Interferometer

Aruto Hosaka, Shota Sawai, Kenichi Hirosawa +1 more

H. Furumochi, Atsushi Tada, Kenichi Hirosawa +3 more

Junichi Higuchi, Norihiko Nishizawa, Masakazu Mori +2 more

Aruto Hosaka, Kenichi Hirosawa, Ryota Sawada +1 more

We numerically and experimentally demonstrate photon-number squeezed state generation with a symmetric fiber interferometer in an 800-nm wavelength and compared with an asymmetric fiber interferometer, although photon-number squeezed pulses have been generated only with asymmetric interferometers. Even though we obtain -1.0dB squeezing with an asymmetric fiber interferometer, since perfect spectral phase and intensity matching between displacement and signal pulses are achieved with a symmetric fiber interferometer, we obtain better squeezing of -3.1dB. We also numerically calculate and clarify this scheme's usefulness at a 1.55-μm wavelength.

Aruto Hosaka, Kenichi Hirosawa, Ryota Sawada +1 more

Photon number of coherent light obeys Poisson distribution, and its variance is proportional to the intensity of the light. Photon-number squeezed state is the light whose variance is reduced below the standard quantum limit. In general, photon-number squeezed state has been generated with femtosecond pulses and asymmetric fiber interferometer [1]. However, due to difference of nonlinearity in the two arms, mismatch of spectrum shape and phase is occurred for two pulses. As a result, the squeezing level becomes lower. It is especially true for pulses in the normal dispersion regime.

Stefan Schmitt, Joachim Hans Ficker, Friedrich König +4 more