Activation of post-quantum steering

• URL: http://arxiv.org/abs/2406.10570v3
• Date: Sat, 08 Nov 2025 10:08:30 GMT
• Title: Activation of post-quantum steering
• Authors: Ana Belén Sainz, Paul Skrzypczyk, Matty J. Hoban,
• Abstract summary: We show how to activate post-quantum steering so that it can now be witnessed as post-quantum correlations in a Bell scenario.<n>One element of our work that may be of independent interest is we show how to self-test a bipartite quantum assemblage in a network.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: There are possible physical theories that give greater violations of Bell's inequalities than the corresponding Tsirelson bound, termed post-quantum non-locality. Such theories do not violate special relativity, but could give an advantage in certain information processing tasks. There is another way in which entangled quantum states exhibit non-classical phenomena, with one notable example being Einstein-Podolsky-Rosen (EPR) steering; a violation of a bipartite Bell inequality implies EPR steering, but the converse is not necessarily true. The study of post-quantum EPR steering is more intricate, but it has been shown that it does not always imply post-quantum non-locality in a conventional Bell test. In this work we show how to distribute resources in a larger network that individually do not demonstrate post-quantum non-locality but violate a Tsirelson bound for the network. That is, we show how to activate post-quantum steering so that it can now be witnessed as post-quantum correlations in a Bell scenario. One element of our work that may be of independent interest is we show how to self-test a bipartite quantum assemblage in a network, even assuming post-quantum resources.

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