分布在 100 千米单模光纤上的完全可控的时间束纠缠态

IF 5.8 2区 物理与天体物理 Q1 OPTICS EPJ Quantum Technology Pub Date : 2024-09-04 DOI:10.1140/epjqt/s40507-024-00267-5
Jinwoo Kim, Jiho Park, Hong-Seok Kim, Guhwan Kim, Jin Tae Kim, Jaegyu Park, Kiwon Moon, Seung-Chan Kwak, Min-su Kim, Jung Jin Ju
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引用次数: 0

摘要

量子网络要想在量子密钥分发之外执行用户定义的协议,就需要完全可控的纠缠量子态。为了扩大产生时间带纠缠态的可用空间,我们展示了一种时间带纠缠光子源,它能产生相位和振幅完全可控的量子比特态(|{\psi}\rangle = \alpha |{00}\rangle + \beta |{11}\rangle \)。我们从缩小的双量子比特布洛赫球上的任意状态中选择并制备了八种不同的双光子态。以时间分段方案编码的光子对是在2.4 MHz频率下产生的,可见度为\(V = 0.9475 \pm 0.0016\),违反了197个标准偏差的CHSH贝尔不等式。在 100 千米的单模光纤上进行纠缠分发后,我们得到了可见度(V = 0.9541 \pm 0.0113),违反了 CHSH 贝尔不等式 6 个标准差。所制备的状态在光源处的平均保真度为(0.9540 \pm 0.0016),而在纠缠分发后的平均保真度为(0.9353 ^{+0.0100}_{-0.0209}\ ),这表明我们的时间带纠缠光子源所产生的量子态可以被完全控制,有可能达到适用于远距离先进量子网络系统的水平。
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Fully controllable time-bin entangled states distributed over 100-km single-mode fibers

Quantum networks that can perform user-defined protocols beyond quantum key distribution will require fully controllable entangled quantum states. To expand the available space of generated time-bin entangled states, we demonstrate a time-bin entangled photon source that produces qubit states \(|{\psi}\rangle = \alpha |{00}\rangle + \beta |{11}\rangle \) with fully controllable phase and amplitudes. Eight different two-photon states have been selected and prepared from arbitrary states on the reduced two-qubit Bloch sphere. The photon pairs encoded in the time-bin scheme were generated at 2.4 MHz with a visibility of \(V = 0.9475 \pm 0.0016\), with a violation of the CHSH Bell’s inequality by 197 standard deviations. After entanglement distribution over 100 km of single-mode fibers, we obtained a visibility of \(V = 0.9541 \pm 0.0113\) with a violation of the CHSH Bell’s inequality by 6 standard deviations. The prepared states had an average fidelity of \(0.9540 \pm 0.0016\) at the source and an average fidelity of \(0.9353 ^{+0.0100}_{-0.0209}\) after entanglement distribution, which shows that the quantum states generated by our time-bin entangled photon source can be fully controlled potentially to a level applicable to long-distance advanced quantum network systems.

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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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