8×8 reconfigurable quantum photonic processor based on silicon nitride waveguides
Caterina Taballione, Tom A. W. Wolterink, Jasleen Lugani, Andreas Eckstein, Bryn A. Bell, Robert Grootjans, Ilka Visscher, Dimitri Geskus, Chris G. H. Roeloffzen, Jelmer J. Renema, Ian A. Walmsley, Pepijn W. H. Pinkse, Klaus-J. Boller · Optics Express · 2019
The development of large-scale optical quantum information processing circuits ground on the stability and reconfigurability enabled by integrated photonics. We demonstrate a reconfigurable 8×8 integrated linear optical network based on silicon nitride waveguides for quantum information processing. Our processor implements a novel optical architecture enabling any arbitrary linear transformation and constitutes the largest programmable circuit reported so far on this platform. We validate a variety of photonic quantum information processing primitives, in the form of Hong-Ou-Mandel interference, bosonic coalescence/anti-coalescence and high-dimensional single-photon quantum gates. We achieve fidelities that clearly demonstrate the promising future for large-scale photonic quantum information processing using low-loss silicon nitride.