Perfect discrimination of no-signalling channels via quantum superposition of causal structures

G. Chiribella

doi:10.1103/PhysRevA.86.040301

Perfect discrimination of no-signalling channels via quantum superposition of causal structures

Quantum Physics 2012-11-28 v3

Authors: G. Chiribella

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Abstract

A no-signalling channel transforming quantum systems in Alice's and Bob's laboratories is compatible with two different causal structures: (A < B) Alice's output causally precedes Bob's input and (B< A) Bob's output causally precedes Alice's input. I show that a quantum superposition of circuits operating within these two causal structures enables the perfect discrimination between no-signalling channels that can not be perfectly distinguished by any ordinary circuit.

Keywords

no-signalling channels quantum superposition causal structures quantum discrimination indefinite causal order

Cite

@article{arxiv.1109.5154,
  title  = {Perfect discrimination of no-signalling channels via quantum superposition of causal structures},
  author = {G. Chiribella},
  journal= {arXiv preprint arXiv:1109.5154},
  year   = {2012}
}

Comments

5 + 5 pages, published version

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