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Watch a conference talk from TQC 2023 exploring the connection between indefinite causal order processes and composable quantum protocols in spacetime. Delve into how quantum circuits with quantum control of causal order (QC-QC) relate to causal boxes that describe practical quantum information protocols. Learn about the operational equivalence between these frameworks and how this enables well-defined composition of QC-QCs. Discover insights into which indefinite causal order processes can be physically realized in spacetime, with findings suggesting they correspond to controlled superpositions of acyclic orders. Understand the implications for quantum information processing applications and how this research addresses longstanding questions about practicality and composability of indefinite causal structures.
