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Quantum Foundations
Parity erasure: a foundational principle for indefinite causal order
arXiv
Authors: Zixuan Liu, Ognyan Oreshkov
Year
2025
Paper ID
15952
Status
Preprint
Abstract Read
~2 min
Abstract Words
82
Citations
N/A
Abstract
Processes with indefinite causal order can arise when quantum theory is locally valid. Here, we identify an information-theoretic principle, termed parity erasure, that completely characterizes such processes. Our characterization does not rely on the formalism of quantum theory itself, but instead is derived from a set of axioms for general operational probabilistic theories, and thus holds also for a large class of theories beyond quantum theory. This informational approach reveals a fundamental property of information exchange in scenarios with indefinite causal structure.
Why This Paper Matters
- This paper contributes to the Quantum Foundations research area in the Quantum Articles archive.
- It adds a 2025 reference point for readers tracking recent quantum research.
- Processes with indefinite causal order can arise when quantum theory is locally valid.
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