量子信道单位性的校准无关约束,应用于频率转换器

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Matthias Bock, Pavel Sekatski, Jean-Daniel Bancal, Stephan Kucera, Tobias Bauer, Nicolas Sangouard, Christoph Becher, Jürgen Eschner
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引用次数: 0

摘要

我们报告了一种借助信号源和测量设备认证单元操作的方法,这些设备在整个认证过程中的校准无需信任。与独立于设备的范例一样,我们的认证方法依赖于贝尔测试,不需要对底层希尔伯特空间维度进行假设,但它通过包含非检测事件独立于测量设置的单一额外假设,消除了对高检测效率的需求。通过对量子频率转换器的单位性进行约束,实验证明了所提方法的相关性。实验从一个 40Ca+ 离子和一个 854 纳米光子之间最大纠缠双量子比特态的预示性产生开始。然后,通过嵌入萨格纳克干涉仪的非线性波导,实现了到电信波段的纠缠保频转换。由此产生的离子-电信光子纠缠态通过贝尔-CHSH 测试进行评估,并从中量化频率转换的质量。我们证明频率转换的平均认证保真度≥84%,在 99% 的置信水平下效率≥3.1 × 10-6。这确保了该转换器可通过可信的表征程序集成到量子网络中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Calibration-independent bound on the unitarity of a quantum channel with application to a frequency converter

Calibration-independent bound on the unitarity of a quantum channel with application to a frequency converter

We report on a method to certify a unitary operation with the help of source and measurement apparatuses whose calibration throughout the certification process needs not be trusted. As in the device-independent paradigm our certification method relies on a Bell test and requires no assumption on the underlying Hilbert space dimension, but it removes the need for high detection efficiencies by including the single additional assumption that non-detected events are independent of the measurement settings. The relevance of the proposed method is demonstrated experimentally by bounding the unitarity of a quantum frequency converter. The experiment starts with the heralded creation of a maximally entangled two-qubit state between a single 40Ca+ ion and a 854 nm photon. Entanglement preserving frequency conversion to the telecom band is then realized with a non-linear waveguide embedded in a Sagnac interferometer. The resulting ion-telecom photon entangled state is assessed by means of a Bell-CHSH test from which the quality of the frequency conversion is quantified. We demonstrate frequency conversion with an average certified fidelity of ≥84% and an efficiency ≥3.1 × 10−6 at a confidence level of 99%. This ensures the suitability of the converter for integration in quantum networks from a trustful characterization procedure.

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来源期刊
npj Quantum Information
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.
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