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Ultrabroadband Entangled Photons on a Nanophotonic Chip
- Source :
- Physical review letters. 127(18)
- Publication Year :
- 2021
-
Abstract
- Nanophotonic entangled-photon sources are a critical building block of chip-scale quantum photonic architecture and have seen significant development over the past two decades. These sources generate photon pairs that typically span over a narrow frequency bandwidth. Generating entanglement over a wide spectral region has proven to be useful in a wide variety of applications including quantum metrology, spectroscopy and sensing, and optical communication. However, generation of broadband photon pairs with temporal coherence approaching an optical cycle on a chip is yet to be seen. Here we demonstrate generation of ultra-broadband entangled photons using spontaneous parametric down-conversion in a periodically-poled lithium niobate nanophotonic waveguide. We employ dispersion engineering to achieve a bandwidth of 100 THz (1.2 - 2 $��$m), at a high efficiency of 13 GHz/mW. The photons show strong temporal correlations and purity with the coincidence-to-accidental ratio exceeding $10^5$ and $>$ 98\% two-photon interference visibility. These properties together with the piezo-electric and electro-optic control and reconfigurability, make thin-film lithium niobate an excellent platform for a controllable entanglement source for quantum communication and computing, and open a path towards femtosecond metrology and spectroscopy with non-classical light on a nanophotonic chip.<br />10 pages, 7 figures
- Subjects :
- Physics
Waveguide (electromagnetism)
Photon
Terahertz radiation
Lithium niobate
FOS: Physical sciences
General Physics and Astronomy
Physics::Optics
Applied Physics (physics.app-ph)
Quantum entanglement
Physics - Applied Physics
7. Clean energy
01 natural sciences
010309 optics
Quantum technology
chemistry.chemical_compound
Photon entanglement
chemistry
0103 physical sciences
Spectral width
Atomic physics
010306 general physics
Optics (physics.optics)
Physics - Optics
Subjects
Details
- ISSN :
- 10797114
- Volume :
- 127
- Issue :
- 18
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....25b205dc2541fcd5c0f59c879d5c2059