title: On-chip generation of heralded photon-number states.
abstract: Beyond the use of genuine monolithic integrated optical platforms, we report here a hybrid strategy enabling on-chip generation of configurable heralded two-photon states. More specifically, we combine two different fabrication techniques, i.e., non-linear waveguides on lithium niobate for efficient photon-pair generation and femtosecond-laser-direct-written waveguides on glass for photon manipulation. Through real-time device manipulation capabilities, a variety of path-coded heralded two-photon states can be produced, ranging from product to entangled states. Those states are engineered with high levels of purity, assessed by fidelities of 99.5 ± 8% and 95.0 ± 8%, respectively, obtained via quantum interferometric measurements. Our strategy therefore stands as a milestone for further exploiting entanglement-based protocols, relying on engineered quantum states, and enabled by scalable and compatible photonic circuits.
authors: Université Côte d'Azur, CNRS, Laboratoire de Physique de la Matière Condensée, France.
authors: Panagiotis
authors: P
authors: Vergyris
authors: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Department of Physics and Astronomy, MQ Photonics Research Centre, Macquarie University, North Ryde, 2109 NSW, Australia.
authors: Thomas
authors: T
authors: Meany
authors: Université Côte d'Azur, CNRS, Laboratoire de Physique de la Matière Condensée, France.
authors: Tommaso
authors: T
authors: Lunghi
authors: Université Côte d'Azur, CNRS, Laboratoire de Physique de la Matière Condensée, France.
authors: Gregory
authors: G
authors: Sauder
authors: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Department of Physics and Astronomy, MQ Photonics Research Centre, Macquarie University, North Ryde, 2109 NSW, Australia.
authors: James
authors: J
authors: Downes
authors: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Department of Physics and Astronomy, MQ Photonics Research Centre, Macquarie University, North Ryde, 2109 NSW, Australia.
authors: M J
authors: MJ
authors: Steel
authors: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Department of Physics and Astronomy, MQ Photonics Research Centre, Macquarie University, North Ryde, 2109 NSW, Australia.
authors: Michael J
authors: MJ
authors: Withford
authors: Université Côte d'Azur, CNRS, Laboratoire de Physique de la Matière Condensée, France.
authors: Olivier
authors: O
authors: Alibart
authors: Université Côte d'Azur, CNRS, Laboratoire de Physique de la Matière Condensée, France.
authors: Sébastien
authors: S
authors: Tanzilli