Undergraduate setup for measuring the Bell inequalities and performing quantum state tomography

IF 5.8 2区 物理与天体物理 Q1 OPTICS
Raul Lahoz Sanz, Lidia Lozano Martín, Adrià Brú i Cortés, Martí Duocastella, Jose M. Gomez, Bruno Juliá-Díaz
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引用次数: 0

Abstract

The growth of quantum technologies is attracting the interest of many students eager to learn concepts such as quantum entanglement or quantum superposition. However, the non-intuitive nature of these concepts poses a challenge to understanding them. Here, we present an entangled photon system which can perform a Bell test, i.e. the CHSH inequality, and can obtain the complete tomography of the two-photon state. The proposed setup is versatile, cost-effective and allows for multiple classroom operating modes. We present two variants, both facilitating the measurement of Bell inequalities and quantum state tomography. Experimental results showcase successful manipulation of the quantum state of the photons, achieving high-fidelity entangled states and significant violations of Bell’s inequalities. Our setup’s simplicity and affordability enhances accessibility for less specialized laboratories, allowing students to familiarize themselves with quantum physics concepts.

本科生设置测量贝尔不等式和执行量子态断层扫描
量子技术的发展吸引了许多渴望学习量子纠缠或量子叠加等概念的学生的兴趣。然而,这些概念的非直觉性给理解它们带来了挑战。在这里,我们提出了一个纠缠光子系统,它可以进行贝尔测试,即CHSH不等式,并可以获得双光子态的完整层析成像。所建议的设置是多功能的,具有成本效益,并允许多种教室操作模式。我们提出了两种变体,它们都有助于贝尔不等式和量子态层析成像的测量。实验结果显示,成功地操纵了光子的量子态,实现了高保真的纠缠态,并显著违反了贝尔不等式。我们的设置的简单性和可负担性提高了不太专业的实验室的可访问性,让学生熟悉量子物理概念。
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来源期刊
EPJ Quantum Technology
EPJ Quantum Technology Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
7.70
自引率
7.50%
发文量
28
审稿时长
71 days
期刊介绍: Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics. EPJ Quantum Technology covers theoretical and experimental advances in subjects including but not limited to the following: Quantum measurement, metrology and lithography Quantum complex systems, networks and cellular automata Quantum electromechanical systems Quantum optomechanical systems Quantum machines, engineering and nanorobotics Quantum control theory Quantum information, communication and computation Quantum thermodynamics Quantum metamaterials The effect of Casimir forces on micro- and nano-electromechanical systems Quantum biology Quantum sensing Hybrid quantum systems Quantum simulations.
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