光纤与自由空间信道间主动交换的多模态量子密钥分配场试验

IF 5.8 2区物理与天体物理 Q1 OPTICS

EPJ Quantum Technology Pub Date : 2025-01-16 DOI:10.1140/epjqt/s40507-025-00306-9

Francesco Picciariello, Ilektra Karakosta-Amarantidou, Edoardo Rossi, Marco Avesani, Giulio Foletto, Luca Calderaro, Giuseppe Vallone, Paolo Villoresi, Francesco Vedovato

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引用次数: 0

摘要

多式联运量子密钥分发能够实现光纤网络和自由空间信道的完全互操作性，这两者都是发展全球量子网络的必要要素。我们提出了在一个简单的3节点异构量子网络中的多模式量子密钥分配系统的现场试验-由两个基于偏振的发射器和一个单一的接收器组成-其中有源信道在620米的自由空间链路和17公里长的部署光纤之间交替切换在帕多瓦市区。自由空间通道的性能根据链路的大气湍流强度进行了评估。现场试验在日光条件下持续了几个小时，证明了光纤和自由空间信道之间的互操作性，两个信道的密钥速率都为kbps数量级。结论量子密钥分发硬件和软件在两个通道上工作不需要不同的策略，即使链路的内在特征明显不同。

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Intermodal quantum key distribution field trial with active switching between fiber and free-space channels

Background

Intermodal quantum key distribution enables the full interoperability of fiber networks and free-space channels, which are both necessary elements for the development of a global quantum network. We present a field trial of an intermodal quantum key distribution system in a simple 3-node heterogeneous quantum network — comprised of two polarization-based transmitters and a single receiver — in which the active channel is alternately switched between a free-space link of 620 m and a 17 km-long deployed fiber in the metropolitan area of Padova.

Findings

The performance of the free-space channel is evaluated against the atmospheric turbulence strength of the link. The field trial lasted for several hours in daylight conditions, attesting the interoperability between fiber and free-space channels, with a secret key rate of the order of kbps for both the channels.

Conclusions

The quantum key distribution hardware and software require no different strategies to work over the two channels, even if the intrinsic characteristics of the links are clearly different.

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来源期刊

EPJ Quantum Technology Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

7.70

自引率

7.50%

发文量

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.