2016/05/31 by Panagiotis Vergyris, Thomas Meany, Tommaso Lunghi +7 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Chip #Computer science #Femtosecond #Interferometry #Laser #Lithium niobate #Neural Networks and Reservoir Computing #Optics #Optoelectronics #Photon #Photon entanglement #Photonic and Optical Devices #Photonics #Physics #Quantum #Quantum Information and Cryptography #Quantum entanglement #Quantum mechanics #Scalability #Telecommunications #quant-ph
paper · pdf · doi:10.1038/srep35975
published as Sci. Rep. 6, 35975 (2016)
openalex publication_date 2016/10/24 · arxiv created 2016/10/27 · arxiv updated 2016/10/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.