菱面体氮化硼中可调谐偏振纠缠光子对源。

IF 12.5 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2025-01-22 DOI:10.1126/sciadv.adt3710

Haidong Liang, Tian Gu, Yanchao Lou, Chengyuan Yang, Chaojie Ma, Jiajie Qi, Andrew A. Bettiol, Xilin Wang

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引用次数: 0

摘要

纠缠光子对源是各种量子应用的关键。小型化量子器件以满足有限空间应用的要求，推动了对超紧凑纠缠光子对源的研究。二维（2D）半导体的兴起已被证明是超紧凑纠缠光子对源。然而，光子对的产生率和纯度相对较低，并且二维半导体中较强的光致发光也使其工作波长范围受到限制。本文利用菱形氮化硼（rBN）的自发参数下转换（SPDC）作为偏振纠缠光子对源。我们已经实现了超过120赫兹的生成速率（与二维材料的SPDC符合率创历史新高）和巧合比超过200的高纯度光子对生成。可调贝尔状态的产生也证明了简单地旋转泵偏振，保真度高达0.93。我们的结果表明rBN是片上集成量子器件的理想候选者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Tunable polarization entangled photon-pair source in rhombohedral boron nitride

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Tunable polarization entangled photon-pair source in rhombohedral boron nitride

Entangled photon-pair sources are pivotal in various quantum applications. Miniaturizing the quantum devices to meet the requirement in limited space applications drives the search for ultracompact entangled photon-pair sources. The rise of two-dimensional (2D) semiconductors has been demonstrated as ultracompact entangled photon-pair sources. However, the photon-pair generation rate and purity are relatively low, and the strong photoluminescence in 2D semiconductors also makes the operational wavelength range limited. Here, we use the spontaneous parametric down conversion (SPDC) of rhombohedral boron nitride (rBN) as a polarization entangled photon-pair source. We have achieved a generation rate of more than 120 hertz (a record-high SPDC coincidence rate with 2D materials) and a high-purity photon-pair generation with a coincidence-to-accidental ratio of above 200. Tunable Bell state generation is also demonstrated by simply rotating the pump polarization, with a fidelity up to 0.93. Our results suggest rBN as an ideal candidate for on-chip integrated quantum devices.

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.