We report the realization of a bright ultrafast two-mode squeezer based on type II parametric downconversion (PDC) in periodically poled KTiOPO4 (PP-KTP) waveguides. It produces a pulsed two-mode squeezed vacuum state: a photon-number entangled pair of truly single-mode pulses or, in terms of continuous variables quantum optics, a pulsed, single mode Einstein-Podolsky-Rosen (EPR) state in the telecom regime. We prove the single mode character of our source by measuring its g(2) correlation function and demonstrate a mean photon number of up to 2.5 per pulse, equivalent to 11dB of two-mode squeezing.
@article{arxiv.1006.5667,
title = {A bright, pulsed two-mode squeezer},
author = {Andreas Eckstein and Andreas Christ and Peter J. Mosley and Christine Silberhorn},
journal= {arXiv preprint arXiv:1006.5667},
year = {2011}
}