Dual-path source engineering in integrated quantum optics

Regina Kruse, Linda Sansoni, Sebastian Brauner, Raimund Ricken, Craig S. Hamilton, Igor Jex, and Christine Silberhorn
Phys. Rev. A 92, 053841 – Published 18 November 2015

Abstract

Quantum optics in combination with integrated optical devices shows great promise for efficient manipulation of single photons. New physical concepts, however, can only be found when these fields truly merge and reciprocally enhance each other. Here we work at the merging point and investigate the physical concept behind a two-coupled-waveguide system with an integrated parametric down-conversion process. We use the eigenmode description of the linear system and the resulting modification in momentum conservation to derive the state generation protocol for this type of device. With this new concept of state engineering, we are able to effectively implement a two-in-one waveguide source that produces the useful two-photon NOON state without extra overhead such as phase stabilization or narrow-band filtering. Experimentally, we benchmark our device by measuring a two-photon NOON state fidelity of F=(84.2±2.6)% and observe the characteristic interferometric pattern directly given by the doubled phase dependence with a visibility of VNOON=(93.3±3.7)%.

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  • Received 14 July 2015

DOI:https://doi.org/10.1103/PhysRevA.92.053841

©2015 American Physical Society

Authors & Affiliations

Regina Kruse1,*, Linda Sansoni1, Sebastian Brauner1, Raimund Ricken1, Craig S. Hamilton2, Igor Jex2, and Christine Silberhorn1

  • 1Integrated Quantum Optics, Applied Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
  • 2FNSPE, Czech Technical University in Prague, Břehová 7, 115 19, Praha 1, Czech Republic

  • *Corresponding author: regina.kruse@upb.de

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Vol. 92, Iss. 5 — November 2015

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