Multi-field quantum conferencing overcomes the network capacity limit

• URL: http://arxiv.org/abs/2407.00897v1
• Date: Mon, 1 Jul 2024 01:50:51 GMT
• Title: Multi-field quantum conferencing overcomes the network capacity limit
• Authors: Yuan-Mei Xie, Yu-Shuo Lu, Yao Fu, Hua-Lei Yin, Zeng-Bing Chen,
• Abstract summary: Quantum conferencing enables multiple nodes within a quantum network to share a secure group key for private message broadcasting. The key rate is limited by the repeaterless capacity to distribute multiparticle entangled states across the network. We propose a practical, multi-field scheme that breaks this limit, involving virtually establishing Greenberger-Horne-Zeilinger states.
• Score: 14.261895897404726
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum conferencing enables multiple nodes within a quantum network to share a secure group key for private message broadcasting. The key rate, however, is limited by the repeaterless capacity to distribute multiparticle entangled states across the network. Currently, in the finite-size regime, no feasible schemes utilizing existing experimental techniques can overcome the fundamental rate-distance limit of quantum conferencing in quantum networks without repeaters. Here, we propose a practical, multi-field scheme that breaks this limit, involving virtually establishing Greenberger-Horne-Zeilinger states through post-measurement coincidence matching. This proposal features a measurement-device-independent characteristic and can directly scale to support any number of users. Simulations show that the fundamental limitation on the group key rate can be overcome in a reasonable running time of sending $10^{14}$ pulses. We predict that it offers an efficient design for long-distance broadcast communication in future quantum networks.

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