Mapping indefinite causal order processes to composable quantum protocols in a spacetime

• Published in: New journal of physics Vol. 27; no. 2; pp. 23002 - 54
• Main Authors: Salzger, Matthias, Vilasini, V
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.02.2025; Institute of Physics: Open Access Journals
• Subjects: causal box; causal inequalities; composability of processes; Computer Science; Formalism; Granulation; Information theory; Integrated circuits; Mathematics; physical implementations of processes; physicality of processes; Physics; process matrix; Quantum phenomena; Relativity; Spacetime

Formalisms for higher order quantum processes provide a theoretical formalisation of quantum processes where the order of agents’ operations need not be definite and acyclic, but may be subject to quantum superpositions. This has led to the concept of indefinite causal structures (ICS) which have ga...