Quantum

Pauli Error Composition Determines the Multipartite Advantage in Conference Key Agreement

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 07/10/2026, 04:13:25 UTC.

Briefings

A new study reveals that the Pauli error composition of a quantum channel, rather than its specific type, determines the multipartite advantage in conference key agreement over pairwise BB84. Simulations for N=3 to 5 parties show that amplitude damping and depolarizing noise yield nearly identical performance under average infidelity, while dephasing allows roughly 2.4x more tolerance at N=3. The research establishes a closed-form rate for arbitrary per-party Pauli noise and proves that concentrating noise on one arm is strictly worse than spreading it, and assigning the dealer role to the cleanest arm improves the rate by approximately 18%.

Key points

• The survival of the multipartite advantage in conference key agreement is determined by the Pauli error composition of the channel, not its specific identity.
• Simulations for N=3 to 5 parties under dephasing, amplitude damping, and depolarizing noise show that amplitude damping and depolarizing noise yield nearly identical performance under average infidelity.

Context and limitations

Results are based on exact simulations for N=3, 4, and 5 parties under specific noise models; the closed-form rate derivation assumes arbitrary per-party Pauli noise without further constraints.

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