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Multi-core fiber integrated multi-port beam splitters for quantum information processing
Univ Concepcion, Chile; Univ Concepcion, Chile.
Univ Bio Bio, Chile.
Univ Bristol, England.
Barcelona Inst Sci and Technol, Spain.
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2020 (English)In: Optica, E-ISSN 2334-2536, Vol. 7, no 5, p. 542-550Article in journal (Refereed) Published
Abstract [en]

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 x 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. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Place, publisher, year, edition, pages
OPTICAL SOC AMER , 2020. Vol. 7, no 5, p. 542-550
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URN: urn:nbn:se:liu:diva-166481DOI: 10.1364/OPTICA.388912ISI: 000535764500024OAI: oai:DiVA.org:liu-166481DiVA, id: diva2:1444135
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Funding Agencies|Fondo Nacional de Desarrollo Cientifico y TecnologicoComision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)CONICYT FONDECYT [1200859, 1200266, 1190933, 3170596, 3170400]; Millennium Institute for Research in Optics; Ramon y Cajal fellowshipSpanish Government; Spanish MINECO [QIBEQI FIS2016-80773-P, SEV-2015-0522]; AXA Chair in Quantum Information Science, Generalitat de Catalunya [SGR875]; Fundacio Privada CellexFoundation CELLEX; ERC CoG QITBOX; Royal SocietyRoyal Society of London; COST project [CA16218]; Brazilian grants CNPqNational Council for Scientific and Technological Development (CNPq) [304196/2018-5, FAPERJ E-26/010.002997/2014, E-26/202.7890/2017]; INCT-Informacao Quantica; Ceniit Linkoping University; VetenskapsradetSwedish Research Council [VR 2017-04470]

Available from: 2020-06-20 Created: 2020-06-20 Last updated: 2022-10-04

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