Experimental anonymous quantum conferencing

Abstract

Anonymous quantum conference key agreement (AQCKA) allows a group of users within a network to establish a shared cryptographic key without revealing their participation. Although this can be achieved using bi-partite primitives alone, it is costly in the number of network rounds required. By allowing the use of multi-partite entanglement, there is a substantial efficiency improvement. We experimentally implement the AQCKA task in a six-user quantum network using Greenberger-Horne-Zeilinger (GHZ)-state entanglement and obtain a significant resource cost reduction in line with theory when compared to a bi-partite-only approach. We also demonstrate that the protocol retains an advantage in a four-user scenario with finite key effects taken into account.

References in corpus (7)

• A wavelength-tunable fiber-coupled source of narrowband entangled photons
• Long-distance entanglement purification for quantum communication
• Entanglement Detection in the Stabilizer Formalism
• Distributed quantum phase estimation with entangled photons
• Conference key agreement in a quantum network
• Anonymous conference key agreement in linear quantum networks
• Experimental anonymous conference key agreement using linear cluster states

Cited by in corpus (7)

• Quantum cryptography beyond key distribution: theory and experiment
• Multi-field quantum conferencing overcomes the network capacity limit
• Realizing a Compact, High-Fidelity, Telecom-Wavelength Source of Multipartite Entangled Photons
• Experimental Efficient Source-Independent Quantum Conference Key Agreement
• Quantum-private distributed sensing
• Anonymous and private parameter estimation in networks of quantum sensors
• Guarantees on the structure of experimental quantum networks