Physical principles that single out quantum theory

Quantum correlations between distant particles are stronger than classical ones but weaker than the no-faster-than-light-signalling rule alone permits. The search is for simple physical principles that give exactly the quantum amount.

Why it matters

Such principles would explain why nature is quantum, beyond describing that it is.

Review

Pawlowski, Paterek, Kaszlikowski, Scarani, Winter, Zukowski, Information causality as a physical principle, Nature, 2009. https://doi.org/10.1038/nature08400 reference checked

Timestamp record

Signed record
26891b8e1768…
Public log
Entry 341, in checkpoint 2,123
In the log by
Block 969,698, 2026-10-03

This text was in the PubPhys log by that date. The date says nothing about when the problem was first posed.

4 problems