Study of multiple degrees of freedom entanglement in optical fiber

IF 1.6 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Indian Journal of Physics Pub Date : 2024-08-28 DOI:10.1007/s12648-024-03378-y
Huimin Zhang, Chaoying Zhao
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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.

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光纤中多自由度纠缠的研究
轨道角动量(OAM)因其能够在多个维度上携带信息而受到广泛关注。然而,携带 OAM 的高维纠缠会受环境影响而发生退相干。如何控制纠缠态并确保纠缠态的稳定性和高保真度是量子通信的关键部分。本文通过自发参量下变频产生偏振纠缠光子对,通过操纵量子态的多自由度实现偏振-OAM混合纠缠态。偏振纠缠光子对具有 OAM 特性。我们利用偏振自由度来调制 OAM 自由度,我们的偏振-OAM 混合纠缠态可以减缓传输过程中保真度的降低。这种方法可以为提高 OAM 状态在光纤中的传输保真度提供理论指导。
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来源期刊
Indian Journal of Physics
Indian Journal of Physics 物理-物理:综合
CiteScore
3.40
自引率
10.00%
发文量
275
审稿时长
3-8 weeks
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.
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