{"title":"Study of multiple degrees of freedom entanglement in optical fiber","authors":"Huimin Zhang, Chaoying Zhao","doi":"10.1007/s12648-024-03378-y","DOIUrl":null,"url":null,"abstract":"<p>The orbital angular momentum (OAM) has attracted widespread attention due to its ability to carry information in multiple dimensions. However, a high-dimensional entanglement carrying OAM can be affected by environment and undergoes decoherence. How to control the entangled states and ensure the stability and high fidelity of entangled states is a crucial part of quantum communication. In this paper, we produce the polarization entangled photon pairs by spontaneous parametric down-conversion, we achieve the polarization-OAM hybrid entangled states by manipulating the multi-degrees of freedom of the quantum state. The polarization entangled photon pairs have the characteristics of OAM. We use polarization degree of freedom to modulate OAM degree of freedom, our polarization-OAM hybrid entangled states can slow down the reduction of the fidelity in the transmission process. This method can provide a theoretical guidance for improving the transmission fidelity of OAM states in fiber.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Indian Journal of Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1007/s12648-024-03378-y","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The orbital angular momentum (OAM) has attracted widespread attention due to its ability to carry information in multiple dimensions. However, a high-dimensional entanglement carrying OAM can be affected by environment and undergoes decoherence. How to control the entangled states and ensure the stability and high fidelity of entangled states is a crucial part of quantum communication. In this paper, we produce the polarization entangled photon pairs by spontaneous parametric down-conversion, we achieve the polarization-OAM hybrid entangled states by manipulating the multi-degrees of freedom of the quantum state. The polarization entangled photon pairs have the characteristics of OAM. We use polarization degree of freedom to modulate OAM degree of freedom, our polarization-OAM hybrid entangled states can slow down the reduction of the fidelity in the transmission process. This method can provide a theoretical guidance for improving the transmission fidelity of OAM states in fiber.
期刊介绍:
Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.