Characterising higher-order phase correlations in gain-switched laser sources with application to quantum key distribution

IF 5.8 2区 物理与天体物理 Q1 OPTICS
Alessandro Marcomini, Guillermo Currás-Lorenzo, Davide Rusca, Angel Valle, Kiyoshi Tamaki, Marcos Curty
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引用次数: 0

Abstract

Multi-photon emissions in laser sources represent a serious threat for the security of quantum key distribution (QKD). While the decoy-state technique allows to solve this problem, it requires uniform phase randomisation of the emitted pulses. However, gain-switched lasers operating at high repetition rates do not fully satisfy this requirement, as residual photons in the laser cavity introduce correlations between the phases of consecutive pulses. Here, we introduce experimental schemes to characterise the phase probability distribution of the emitted pulses, and demonstrate that an optimisation task over interferometric measures suffices in determining the impact of arbitrary order correlations, which ultimately establishes the security level of the implementation according to recent security proofs. We expect that our findings may find usages beyond QKD as well.

增益切换激光源高阶相位相关特性及其在量子密钥分配中的应用
激光源中的多光子发射对量子密钥分发(QKD)的安全性构成严重威胁。虽然诱饵态技术可以解决这个问题,但它需要发射脉冲的均匀相位随机化。然而,以高重复率工作的增益开关激光器并不能完全满足这一要求,因为激光腔中的残余光子引入了连续脉冲相位之间的相关性。在这里,我们介绍了实验方案来表征发射脉冲的相位概率分布,并证明了干涉测量的优化任务足以确定任意阶相关性的影响,根据最近的安全证明,这最终建立了实现的安全级别。我们希望我们的发现也能找到QKD以外的用法。
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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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