Biphoton Quantum State Tomography and Spin-orbit Conversion in C+L Telecom Bands
Abstract
High-dimensional quantum states offer the promise of enhancing information capacity in quantum communications. Towards that goal, we here characterize a fiber-based system with the generation and transmission of biphotons in the telecom C+L bands and capable of converting photons with low-dimensional spin subspace to a high-dimensional orbital angular momentum (OAM) subspace (from -5 to +5 topological charge). We experimentally confirm that Bell's inequality is violated with a CHSH value of 2.43. The reconstructed density matrix through polarization quantum state tomography (QST) indicates a fidelity of 92 %, a purity of 86 % and concurrence of 84 % are achieved. The spin (polarization) to OAM conversion through spatial light modulator (SLM) is shown to yield a conversion efficiency of 41.5 %. This work is a step towards achieving multidimensional entanglement and high-dimensional quantum key distribution at standard fiber telecom wavelengths.
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Multidimensional entanglement transport through single-mode fiber
Liu, J., Nape, I. M., Wang, Q., Vallés, A., Wang, J., & Forbes, A. (2020) · Science Advances · doi:10.1126/sciadv.aay0837 · Cited by 115 · see citing works
Self-citationHigh-dimensional cryptography with spatial modes of light: tutorial
Otte, E., Nape, I. M., Rosales‐Guzmán, C., Denz, C., Forbes, A., & Ndagano, B. I. (2020) · Journal of the Optical Society of America B · doi:10.1364/josab.399290 · Cited by 76 · see citing works
Self-citationTurn-key diode-pumped all-fiber broadband polarization-entangled photon source
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- Authors
- Youssef, M., Gounden, N., Ornelas, P., Nape, I., Forbes, A., & Ung, B.
- Affiliations
- École de Technologie Supérieure (CA)
- University of the Witwatersrand (ZA)
- School of Physics, University of the Witwatersrand,Johannesburg,South Africa
- Venue
- 2024 IEEE International Conference on Quantum Computing and Engineering (QCE)
- Publisher
- IEEE
- Published
- 2024-09-15
- Pages
- 569-570
- OpenAlex
- W4406261957
- Semantic Scholar
- 67855ac3be3fa79130b35d7e290fcb44dafb9feb
- Cited by
- 0
- References
- 3
- FWCI
- 0.00
- Type
- conference paper
- Language
- en
- Open access
- closed
- Locations
- IEEE International Conference on Quantum Computing and Engineering (QCE) (publishedVersion)
- Espace ÉTS (ETS) (submittedVersion)
- Funders
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Orbital Angular Momentum in Optics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Keywords
- biphotons, orbital angular momentum, spin-orbit conversion, Bell inequality violation, CHSH inequality, high-dimensional entanglement, spatial light modulator, fiber-based quantum communication, quantum key distribution, concurrence, density matrix reconstruction
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