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

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

2011-09-23

arxiv.org/abs/1109.5154v1

Physics

Quantum Physics

5 pages

Scientific paper

A no-signalling channel transforming quantum systems in Alice's and Bob's laboratories is com- patible 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.

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