Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals

Kleis, Sebastian; Rueckmann, Max; Schaeffer, Christian

doi:10.1364/ol.42.001588

Cited by 94 publications

(114 citation statements)

References 30 publications

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“…Moreover, the transmitter laser will carry a specific amount of phase noise

δ φ

. This phase noise as well as phase offsets between signal laser and LO can be compensated using a strong reference signal sent by Alice, the pilot tone . The pilot tone carries a well‐known phase

ω t

with a fixed phase relation to the signal pulse.…”

Section: Noise Modelsmentioning

confidence: 99%

“…This phase noise as well as phase offsets between signal laser and LO can be compensated using a strong reference signal sent by Alice, the pilot tone. [19,20,22,24] The pilot tone carries a well-known phase ωt with a fixed phase relation to the signal pulse. Bob performs heterodyne detection of the pilot tone, measuring its q and p quadrature.…”

Section: Phase-recovery Noisementioning

confidence: 99%

“…By now, many experimental demonstrations underlined the feasibility of CV-QKD with coherent states. [14][15][16][17][18][19][20][21][22][23][24][25] The experimental performance of these works has to be evaluated in the context of the various settings and assumptions that the respective authors applied and are therefore difficult to compare. After all, a CV-QKD setup is primarily appraised by the secure-key rate that can be achieved over a given transmission distance.…”

Section: Introductionmentioning

confidence: 99%

“…[26][27][28][29][30][31][32][33] This is why recent works are focusing on different methods to avoid the transmission of the local oscillator and to generate it at the receiver lab instead (often referred to as "true local oscillator" or "local local oscillator" [LLO]). [18][19][20]22,24,25,34] Some of the latest papers demonstrated the feasibility of a secure-key rate of a few Mbit s −1 over a channel length of some tens of kilometres using an LLO scheme. [24,25] A good overview of the state-of-the-art in GM CV-QKD and the security of various protocols is given in ref.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations

et al. 2018

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Quantum key distribution (QKD) using weak coherent states and homodyne detection is a promising candidate for practical quantum‐cryptographic implementations due to its compatibility with existing telecom equipment and high detection efficiencies. However, despite the actual simplicity of the protocol, the security analysis of this method is rather involved compared to discrete‐variable QKD. This article reviews the theoretical foundations of continuous‐variable quantum key distribution (CV‐QKD) with Gaussian modulation and rederives the essential relations from scratch in a pedagogical way. The aim of this paper is to be as comprehensive and self‐contained as possible in order to be well intelligible even for readers with little pre‐knowledge on the subject. Although the present article is a theoretical discussion of CV‐QKD, its focus lies on practical implementations, taking into account various kinds of hardware imperfections and suggesting practical methods to perform the security analysis subsequent to the key exchange. Apart from a review of well‐known results, this manuscript presents a set of new original noise models which are helpful to get an estimate of how well a given set of hardware will perform in practice.

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“…Moreover, the transmitter laser will carry a specific amount of phase noise

δ φ

. This phase noise as well as phase offsets between signal laser and LO can be compensated using a strong reference signal sent by Alice, the pilot tone . The pilot tone carries a well‐known phase

ω t

with a fixed phase relation to the signal pulse.…”

Section: Noise Modelsmentioning

confidence: 99%

Section: Phase-recovery Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations

et al. 2018

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“…After the quantum transmission stage, the n − 1 players and the dealer first correct the raw data by performing rotation x k = x k cos φ k − p k sin φ k ; p k = x k sin φ k + p k cos φ k , then they proceed with the remaining steps of the protocol. This phase recovery scheme has been successfully demonstrated in CV-QKD [32,39,41,42].…”

Section: Discussionmentioning

confidence: 94%

Quantum secret sharing using weak coherent states

Grice

2019

Phys. Rev. A

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Secret sharing allows a trusted party (the dealer) to distribute a secret to a group of players, who can only access the secret cooperatively. Quantum secret sharing (QSS) protocols could provide unconditional security based on fundamental laws in physics. While the general security proof has been established recently in an entanglement-based QSS protocol, the tolerable channel loss is unfortunately rather small. Here we propose a continuous variable QSS protocol using conventional laser sources and homodyne detectors. In this protocol, a Gaussian-modulated coherent state (GMCS) prepared by one player passes through the secure stations of the other players sequentially, and each of the other players injects a locally prepared, independent GMCS into the circulating optical mode. Finally, the dealer measures both the amplitude and the phase quadratures of the receiving optical mode using double homodyne detectors. Collectively, the players can use their encoded random numbers to estimate the measurement results of the dealer and further generate a shared key. We prove the unconditional security of the proposed protocol against both eavesdroppers and dishonest players in the presence of high channel loss, and discuss various practical issues. a

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Quantum Communication Networks for Energy Applications: Review and Perspective

Paudel,

Crawford,

Lee

et al. 2023

Adv Quantum Tech

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The energy sector is expected to undergo significant changes in the coming decades with the advent of new technologies, including smart grid development, microgrid expansion, increasing electric vehicle and renewable energy usage, and enhanced measures to minimize greenhouse gas emission, among others. In tandem, these changes are expected to create new opportunities for the deployment of quantum technologies within the energy sector. Building on the authors' previous reviews on the current state of and future opportunities for quantum sensing, quantum computing and quantum simulations for energy sector applications, this work provides an overview of recent progress in quantum networking and communications for the energy industry, with a focus on platforms, devices, and protocols, including quantum teleportation and quantum key distribution. Specific areas of relevance to the energy sector are then analyzed, including the role of quantum networks for greenhouse gas monitoring, secure data collection and transmission in smart grids, nuclear power plants’ safety, facilitating oil and gas exploration, and other energy‐relevant applications. This review concludes with a brief overview of areas for future innovation, including the need for platforms for simulating quantum networks, quantum material and platform design, and computational approaches to accelerate quantum protocol discovery and development.

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Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals

Cited by 94 publications

References 30 publications

Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations

Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations

Quantum secret sharing using weak coherent states

Quantum Communication Networks for Energy Applications: Review and Perspective

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