Experimental anonymous quantum conferencing

• URL: http://arxiv.org/abs/2311.14158v1
• Date: Thu, 23 Nov 2023 19:00:01 GMT
• Title: Experimental anonymous quantum conferencing
• Authors: Jonathan W. Webb, Joseph Ho, Federico Grasselli, Gl\'aucia Murta, Alexander Pickston, Andr\'es Ulibarrena and Alessandro Fedrizzi
• Abstract summary: We experimentally implement the AQCKA task in a six-user quantum network using Greenberger-Horne-Zeilinger (GHZ)-state entanglement. We also demonstrate that the protocol retains an advantage in a four-user scenario with finite key effects taken into account.
• Score: 72.27323884094953
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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