Multipartite secure state distribution

Details Multipartite secure state distribution Multipartite secure state distribution

2004-11-30

arxiv.org/abs/quant-ph/0411209v2

Phys. Rev. A 71, 042336 (2005)

Physics

Quantum Physics

V2: Replaced with published version: title changed, 2 figures added, presentation improved

Scientific paper

10.1103/PhysRevA.71.042336

We introduce the distribution of a secret multipartite entangled state in a real-world scenario as a quantum primitive. We show that in the presence of noisy quantum channels (and noisy control operations) any state chosen from the set of two-colorable graph states (CSS codewords) can be created with high fidelity while it remains unknown to all parties. This is accomplished by either blind multipartite entanglement purification, which we introduce in this paper, or by multipartite entanglement purification of enlarged states, which offers advantages over an alternative scheme based on standard channel purification and teleportation. The parties are thus provided with a secret resource of their choice for distributed secure applications.

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