Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8948
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Funding
- European Research Council through the BBOI project
- Department of the Army, US Army Research Office
- Engineering and Physical Sciences Research Council (EPSRC, UK) Early Career Fellowship
- EPSRC Doctoral Training Account
- Natural Sciences and Engineering Research Council (Canada) Alexander Graham Bell Canada Graduate Scholarship
- Royal Society Wolfson Merit Award
- Royal Academy of Engineering Chair in Emerging Technologies
- Engineering and Physical Sciences Research Council [EP/L024020/1, EP/J017175/1, EP/K021931/1, EP/K033085/1, EP/K023063/1] Funding Source: researchfish
- EPSRC [EP/J017175/1, EP/L024020/1, EP/K023063/1, EP/K021931/1, EP/K033085/1] Funding Source: UKRI
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Entanglement-one of the most delicate phenomena in nature-is an essential resource for quantum information applications. Scalable photonic quantum devices must generate and control qubit entanglement on-chip, where quantum information is naturally encoded in photon path. Here we report a silicon photonic chip that uses resonant-enhanced photon-pair sources, spectral demultiplexers and reconfigurable optics to generate a path-entangled two-qubit state and analyse its entanglement. We show that ring-resonator-based spontaneous four-wave mixing photon-pair sources can be made highly indistinguishable and that their spectral correlations are small. We use on-chip frequency demultiplexers and reconfigurable optics to perform both quantum state tomography and the strict Bell-CHSH test, both of which confirm a high level of on-chip entanglement. This work demonstrates the integration of high-performance components that will be essential for building quantum devices and systems to harness photonic entanglement on the large scale.
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