Quantum Conference Key Agreement with Photon Loss

Singkanipa, Phattharaporn; Kok, Pieter

doi:10.48550/arxiv.2101.01483

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…In this context, the effect of losses on general conference key agreement has been studied recently [30]; it would be interesting to investigate whether a similar approach can be deployed while preserving anonymity. Future steps will be the implementation of our protocol in larger-scale networks and active switching for closing loopholes [31].…”

Section: Discussionmentioning

confidence: 99%

Anonymous and secret communication in quantum networks

Thalacker,

Hahn,

de Jong

et al. 2021

Preprint

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Secure communication is one of the key applications of quantum networks. In recent years, following the demands for identity protection in classical communication protocols, the need for anonymity has also emerged for quantum networks. Here, we demonstrate that quantum physics allows parties-besides communicating securely over a network-to also keep their identities secret. We implement such an anonymous quantum conference key agreement by sharing multipartite entangled states in a quantum network. We demonstrate the protocol with four parties and establish keys in subsets of the network-different combinations of two and three parties-whilst keeping the participating parties anonymous. We additionally show that the protocol is verifiable and run multiple key generation and verification routines. Our work thus addresses one of the key challenges of networked communication: keeping the identities of the communicating parties private.

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Section: Discussionmentioning

confidence: 99%

Anonymous and secret communication in quantum networks

Thalacker,

Hahn,

de Jong

et al. 2021

Preprint

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Continuous variable quantum conference network with a Greenberger–Horne–Zeilinger entangled state

Qin¹,

Ma²,

Zhao³

et al. 2023

Photon. Res.

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Quantum conference (QC) is a cryptographic task in secure communications that involves more than two users wishing to establish identical secret keys among N users. The Greenberger–Horne–Zeilinger (GHZ) entangled state is the basic resource for quantum cryptographic communication due to the existence of multipartite quantum correlations. An unconditional and efficient quantum network can be established with a continuous variable (CV) GHZ entangled state because of its deterministic entanglement. Here, we report an implementation of QC scheme using a CV multipartite GHZ entangled state. The submodes of a quadripartite GHZ entangled state are distributed to four spatially separated users. The proposed QC scheme is proved to be secure even when the entanglement is distributed through lossy quantum channels and the collective Gaussian attacks are in the all lossy channels. The presented QC scheme has the capability to be directly extended to a larger scale quantum network by using entangled states with more submodes.

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Quantum Conference Key Agreement with Photon Loss

Cited by 2 publications

References 41 publications

Anonymous and secret communication in quantum networks

Anonymous and secret communication in quantum networks

Continuous variable quantum conference network with a Greenberger–Horne–Zeilinger entangled state

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