Degenerate polarization entangled photon source based on a single Ti-diffusion lithium niobate waveguide in a polarization Sagnac interferometer
Open accessAbstract
Combining a Ti-diffusion periodically poled lithium niobate (PPLN) waveguide with a Sagnac interferometer, two opposite directions type-II spontaneous parametric down conversions (SPDC) occur coherently and yield a high brightness, high stability polarization entanglement source. The source produces degenerate photon pairs at 1540.4 nm with a brightness of B = (1.36 ± 0.03) × 10 6 pairs/(s⋅nm⋅mW). We perform quantum state tomography to reconstruct the density matrix of the output state and obtain a fidelity of F = 0.983 ± 0.001. The high brightness and phase stability of our waveguide source enable a wide range of quantum information experiments operating at a low pump power as well as hold the advantage in mass production which can promote the practical applications of quantum technologies.
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- Authors
- Sun, Y., Sun, C.-W., Zhou, W., Yang, R., Duan, J.-C., Gong, Y.-X., Xu, P., & Zhu, S.-N.
- Affiliations
- National Laboratory of Solid State Microstructures
- Corresponding author
- Xu, Ping
- Venue
- Chinese Physics B
- Publisher
- IOP Publishing
- Published
- 2023-08-01
- Volume
- 32
- Issue
- 8
- Pages
- 080308
- ISSN
- 1674-1056 (ISSN-L)
- OpenAlex
- W4378224331
- Semantic Scholar
- 5c514d7d5fb02d86ea48700c09fa726dbe1f8ee7
- Cited by
- 3
- References
- 27
- Citations by year
- 2024: 2 · 2023: 1
- FWCI
- 0.27
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Chinese Physics B (publishedVersion, cc-by-nc-nd)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photorefractive and Nonlinear Optics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
- Keywords
- polarization entanglement, entangled photon sources, type-II spontaneous parametric down-conversion, periodically poled lithium niobate, Sagnac interferometer, quantum state tomography, entanglement fidelity, 1540 nm
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