Indefinite causal order is claimed to reverse the real-complex hierarchy, but the RQT/QT separation is not established under N2 normalization.
Hardy, Operationalism, Causality, and Quantum Theory: A mostly time symmetric perspective (2026), arXiv:2603.12076 [quant-ph]
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Indefinite Causal Order Reverses the Real-Complex Hierarchy
Indefinite causal order is claimed to reverse the real-complex hierarchy, but the RQT/QT separation is not established under N2 normalization.