Multi-core fiber integrated multi-port beam splitters for quantum information processing
| Autor: | Gustavo Cañas, Paul Skrzypczyk, Nayda Guerrero, Aldo Delgado, Guilherme B. Xavier, M. A. S. Prosser, Gustavo Lima, Stephen P. Walborn, Tania García, Daniel Cavalcanti, Ivan Šupić, Jaime Cariñe, L. Pereira |
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| Rok vydání: | 2020 |
| Předmět: |
Optical fiber
business.industry Random number generation Computer science Physics::Optics Quantum key distribution Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Interferometry law Electronic engineering Photonics Quantum information business Beam splitter Randomness |
| Zdroj: | Optica. 7:542 |
| ISSN: | 2334-2536 |
| Popis: | Multi-port beam splitters are cornerstone devices for high-dimensional quantum information tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such devices has proven to be challenging with progress only recently achieved with the advent of integrated photonics. Here, we report on the production of high-quality N × N (with N = 4 , 7 ) multi-port beam splitters based on a new scheme for manipulating multi-core optical fibers. By exploring their compatibility with optical fiber components, we create four-dimensional quantum systems and implement the measurement-device-independent random number generation task with a programmable four-arm interferometer operating at a 2 MHz repetition rate. Due to the high visibilities observed, we surpass the one-bit limit of binary protocols and attain 1.23 bits of certified private randomness per experimental round. Our result demonstrates that fast switching, low loss, and high optical quality for high-dimensional quantum information can be simultaneously achieved with multi-core fiber technology. |
| Databáze: | OpenAIRE |
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