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Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry
The phenomenon of Franson interference with time–energy entangled photon pairs beyond the single-photon coherence length observed upon nonlocal measurement at two space-like separated locations is of particular research interest. Herein, we determine the coherence length of temporally separated pair...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8971477/ https://www.ncbi.nlm.nih.gov/pubmed/35361833 http://dx.doi.org/10.1038/s41598-022-09516-y |
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author | Park, Jiho Kim, Heonoh Moon, Han Seb |
author_facet | Park, Jiho Kim, Heonoh Moon, Han Seb |
author_sort | Park, Jiho |
collection | PubMed |
description | The phenomenon of Franson interference with time–energy entangled photon pairs beyond the single-photon coherence length observed upon nonlocal measurement at two space-like separated locations is of particular research interest. Herein, we determine the coherence length of temporally separated pairwise two-photon (TSPT) states of thermal photons emitted from a warm atomic ensemble in Franson-type interferometry, with the setup consisting of two spatially separated unbalanced Michelson interferometers beyond the coherence length of a thermal photon. Using a novel method of square-modulated thermal photons, we show that the sinusoidal Franson-type interference fringe of thermal photons is determined by the presence or absence of TSPT states (corresponding to the time delay between the long and short paths in Franson-type interferometry). We find that the indistinguishability of the TSPT state in the Franson-type interference is independent of the temporal separation of the thermal photons in the TSPT states. |
format | Online Article Text |
id | pubmed-8971477 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-89714772022-04-05 Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry Park, Jiho Kim, Heonoh Moon, Han Seb Sci Rep Article The phenomenon of Franson interference with time–energy entangled photon pairs beyond the single-photon coherence length observed upon nonlocal measurement at two space-like separated locations is of particular research interest. Herein, we determine the coherence length of temporally separated pairwise two-photon (TSPT) states of thermal photons emitted from a warm atomic ensemble in Franson-type interferometry, with the setup consisting of two spatially separated unbalanced Michelson interferometers beyond the coherence length of a thermal photon. Using a novel method of square-modulated thermal photons, we show that the sinusoidal Franson-type interference fringe of thermal photons is determined by the presence or absence of TSPT states (corresponding to the time delay between the long and short paths in Franson-type interferometry). We find that the indistinguishability of the TSPT state in the Franson-type interference is independent of the temporal separation of the thermal photons in the TSPT states. Nature Publishing Group UK 2022-03-31 /pmc/articles/PMC8971477/ /pubmed/35361833 http://dx.doi.org/10.1038/s41598-022-09516-y Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Park, Jiho Kim, Heonoh Moon, Han Seb Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry |
title | Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry |
title_full | Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry |
title_fullStr | Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry |
title_full_unstemmed | Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry |
title_short | Indistinguishability of temporally separated pairwise two-photon state of thermal photons in Franson-type interferometry |
title_sort | indistinguishability of temporally separated pairwise two-photon state of thermal photons in franson-type interferometry |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8971477/ https://www.ncbi.nlm.nih.gov/pubmed/35361833 http://dx.doi.org/10.1038/s41598-022-09516-y |
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