Long-Distance Device-Independent Conference Key Agreement

• URL: http://arxiv.org/abs/2506.01296v1
• Date: Mon, 02 Jun 2025 04:11:30 GMT
• Title: Long-Distance Device-Independent Conference Key Agreement
• Authors: Makoto Ishihara, Anders J. E. Bjerrum, Wojciech Roga, Jonatan B. Brask, Ulrik L. Andersen, Masahiro Takeoka,
• Abstract summary: Device-independent conference key agreement (DI-CKA) is multipartite DI-QKD where more than two parties share a common secure key.<n>We propose a DI-CKA protocol which reduces this limitation by using a heralding scheme to distribute multipartite entanglement.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Device-independent quantum key distribution (DI-QKD) enables two remote parties to share an information-theoretically secure key without any assumptions on the inner workings of the devices used. Device-independent conference key agreement (DI-CKA) is multipartite DI-QKD where more than two parties share a common secure key. The performance of DI-CKA, however, is strictly limited because of its susceptibility to losses due e.g. to imperfect detection efficiency and channel transmission. Here, we propose a DI-CKA protocol which reduces this limitation by using a heralding scheme to distribute multipartite entanglement. We analyze key rates of our protocol for two different measurement scenarios and we show that our protocol outperforms a previous DI-CKA protocol even with an experimentally feasible measurement.

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