Comment on “Fully device-independent conference key agreement”

Holz, Timo; Miller, Daniel; Kampermann, Hermann; Bruß, Dagmar

doi:10.1103/physreva.100.026301

Cited by 11 publications

(12 citation statements)

References 8 publications

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“…Last, all measurement devices are assumed to be memoryless, i.e., each measurement outcome is independent from any other outcome, and detector efficiencies must be basis independent (25). Adapting the QCKA protocol for full (measurement-) device independence is work in progress (26,27).…”

Section: Discussionmentioning

confidence: 99%

Experimental quantum conference key agreement

Proietti

Grasselli

et al. 2021

Sci. Adv.

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Quantum networks will provide multinode entanglement enabling secure communication on a global scale. Traditional quantum communication protocols consume pair-wise entanglement, which is suboptimal for distributed tasks involving more than two users. Here, we demonstrate quantum conference key agreement, a cryptography protocol leveraging multipartite entanglement to efficiently create identical keys between N users with up to N-1 rate advantage in constrained networks. We distribute four-photon Greenberger-Horne-Zeilinger (GHZ) states, generated by high-brightness telecom photon-pair sources, over optical fiber with combined lengths of up to 50 km and then perform multiuser error correction and privacy amplification. Under finite-key analysis, we establish 1.5 × 106 bits of secure key, which are used to encrypt and securely share an image between four users in a conference transmission. Our work highlights a previously unexplored protocol tailored for multinode networks leveraging low-noise, long-distance transmission of GHZ states that will pave the way for future multiparty quantum information processing applications.

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Section: Discussionmentioning

confidence: 99%

Experimental quantum conference key agreement

Proietti

Grasselli

et al. 2021

Sci. Adv.

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“…In this Reply, we address the concerns raised in the Comment [1] and correct the mistake in the proof of our protocol [2]. In our article we presented a protocol for device-independent conference key agreement (CKA) between N parties, Alice,…”

Section: The Issuementioning

confidence: 95%

“…They can, however, agree on any strategy before the start of the game. The CHSH inequality states that by using a classical strategy (a nonquantum strategy), 1 Alice and Bob's winning probability must satisfy the following: As for the CHSH inequality, classical strategies for the parity-CHSH game must satisfy…”

Section: The Solutionmentioning

confidence: 99%

Reply to “Comment on ‘Fully device-independent conference key agreement' ”

2019

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“…[88] initially considers the multipartite Mermin-Ardehali-Belinskii-Klyshko (MABK) inequalities [42][43][44]. However, as shown in [90], the MABK inequalities are not suitable for establishing a conference key, as an overhead amount of information is required for information reconciliation. In Ref.…”

Section: Device-independent Conference Key Agreementmentioning

confidence: 99%

Quantum Conference Key Agreement: A Review

2020

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Conference key agreement (CKA), or multipartite key distribution, is a cryptographic task where more than two parties wish to establish a common secret key. A composition of bipartite quantum key distribution protocols can accomplish this task. However, the existence of multipartite quantum correlations allows for new and potentially more efficient protocols, to be applied in future quantum networks. Here, the existing quantum CKA protocols based on multipartite entanglement are reviewed, both in the device‐dependent and the device‐independent scenario.

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Comment on “Fully device-independent conference key agreement”

Cited by 11 publications

References 8 publications

Experimental quantum conference key agreement

Experimental quantum conference key agreement

Reply to “Comment on ‘Fully device-independent conference key agreement' ”

Quantum Conference Key Agreement: A Review

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