Deterministically separable polarization-entangled photons from battery-powered diode lasers

IF 8.3 1区物理与天体物理 Q1 PHYSICS, APPLIED

npj Quantum Information Pub Date : 2025-07-31 DOI:10.1038/s41534-025-01073-2

Zacharie M. Léger, Trevor J. Stirling, Meng Lon Iu, Amr S. Helmy

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Abstract

Large-scale integrated sources of quantum light are enabling ingredients for the future of photonic quantum technologies. For such platforms, sources based on electrical injection are of value for their turnkey operation, as they do not rely on bulky off-chip sources to achieve quantum nonlinear conversion. This work presents the first demonstration of a source of entangled photons fully contained in a single waveguide. Our source is based on a single battery-powered Bragg reflection waveguide diode laser producing two indistinguishable sources of ultra-broadband polarization-entangled photons. The output state of our device has a Bell-state fidelity of 86.3% without accidental subtraction, a high entangled pair generation rate of 1.16 × 10⁶ (pairs)/(s ⋅ mW ⋅ facet), and an ultra-broadband entangled photon pair bandwidth >5.22 THz. Our approach yields scalable, compact, low-power, and stable sources of polarization-entangled photons, needed for real-world applications of quantum communications and network systems.

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从电池供电的二极管激光器中确定可分离的偏振纠缠光子

大规模集成的量子光源是未来光子量子技术的重要组成部分。对于这样的平台，基于电注入的源对于其交钥匙操作很有价值，因为它们不依赖于笨重的片外源来实现量子非线性转换。这项工作首次展示了完全包含在单个波导中的纠缠光子源。我们的光源是基于单个电池供电的布拉格反射波导二极管激光器，产生两个难以区分的超宽带偏振纠缠光子源。该器件的输出态具有86.3%的贝尔态保真度（无意外减差）、1.16 × 106（对）/(s⋅mW⋅facet)的高纠缠对产生率和5.22 THz的超宽带纠缠光子对带宽。我们的方法产生了可扩展、紧凑、低功耗和稳定的偏振纠缠光子源，这是量子通信和网络系统的实际应用所需要的。

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来源期刊

npj Quantum Information Computer Science-Computer Science (miscellaneous)

CiteScore

13.70

自引率

3.90%

发文量

130

审稿时长

29 weeks

期刊介绍： The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.