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Maximal Secret Reconstruction, Teleportation and Bell's Inequality

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arXiv:2404.01212v2 Announce Type: replace
Abstract: A tripartite state is said to be a potential resource for secret sharing if the state imposes restrictions on the teleportation fidelity of the bipartite dealer--reconstructor and dealer--assistant channels in addition of being useful for the state reconstruction. Given a secret shareable state in a pure three-qubit system, we are able to characterize the set of states with maximum possible reconstruction fidelity (abbreviated as MSR states) for a fixed value of the maximum teleportation fidelity that can be obtained out of both the dealer--receiver channels. Similarly for a value giving the maximum of Bell-CHSH value of both dealer--reconstructor and dealer--assistant channels, we are able to find the maximum achievable reconstruction fidelity. Interestingly, we find that all secret shareable states satisfy Bell's inequality in both dealer--reconstructor and dealer--assistant partitions. This brings out a new mutual exclusivity between secret shareable state and Bell's inequality violations. Our result paves the way in identifying the best candidate among the secret sharing resource states in achieving the maximum reconstruction fidelity thus by setting the practical information transfer limit in a possible resource theoretic extension of secret sharing. It also brings out a new kind of mutual exclusiveness between the bipartite correlation and in the ability of secret sharing in a tripartite setting.

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