Tunable generation of entangled photons in a nonlinear directional coupler
Abstract
The on-chip integration of quantum light sources has enabled the realization of complex quantum photonic circuits. However, for the practical implementation of such circuits in quantum information applications it is crucial to develop sources delivering entangled quantum photon states with on-demand tunability. Here we propose and experimentally demonstrate the concept of a widely tunable quantum light source based on spontaneous parametric down-conversion in a nonlinear directional coupler. We show that spatial photon-pair correlations and entanglement can be reconfigured on-demand by tuning the phase difference between the pump beams and the phase mismatch inside the structure. We demonstrate the generation of split states, robust N00N states, various intermediate regimes and biphoton steering. This fundamental scheme provides an important advance towards the realization of reconfigurable quantum circuitry.
Keywords
Cite
@article{arxiv.1507.03321,
title = {Tunable generation of entangled photons in a nonlinear directional coupler},
author = {Frank Setzpfandt and Alexander S. Solntsev and James Titchener and Che Wen Wu and Chunle Xiong and Roland Schiek and Thomas Pertsch and Dragomir N. Neshev and Andrey A. Sukhorukov},
journal= {arXiv preprint arXiv:1507.03321},
year = {2018}
}