Generation of a squeezing vacuum at a telecommunication wavelength with periodically poled LiNbO3

Abstract

A continuous-wave squeezed vacuum at a telecommunication wavelength was reported. Using an Er-doped fiber amplifier seeded by a single-frequency laser diode as the pump laser source, via a frequency doubler and an optical parametric oscillator based on periodically poled LiNbO3, the squeezed vacuum of 2.4±0.1 dB below the shot noise limit at 1560 nm was observed (the inferred initial squeezing is about 6.4±0.5 dB). This system is compatible with standard telecommunication optical fiber, and will be useful for long-distance quantum communication and distributed quantum computing. © 2008 American Institute of Physics.