Pauli Error Composition Determines the Multipartite Advantage in Conference Key Agreement

Abstract:GHZ-based conference key agreement distributes a shared key to $N$ parties in one network use, whereas pairwise BB84 needs $N-1$. The survival of that advantage has been studied against party number, loss, and topology, but almost always with the channel fixed at depolarizing. Simulating both protocols exactly for $N = 3, 4, 5$ under dephasing, amplitude damping, and depolarizing noise, we find the crossover is set by the channel's Pauli error composition, not its identity: normalized to average infidelity, amplitude damping and depolarizing agree to within about 1\% at each group size, while dephasing can tolerate roughly $2.4\times$ more at $N = 3$. We derive a closed-form rate for arbitrary per-party Pauli noise and use it to prove that concentrating a fixed noise budget on one arm is strictly worse than spreading it, and that giving the dealer role to the cleanest arm improves the rate by roughly 18\%. One structural fact drives every result: the phase-error term is a product over all $N$ arms, while the bit-error term stays local to a pair.

Quantum Physics (quant-ph); Cryptography and Security (cs.CR); Networking and Internet Architecture (cs.NI)

C.5.0; E.3; C.2.2

arXiv:2610.07251 [quant-ph]

(or arXiv:2610.07251v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.07251 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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