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quant-ph2026
Causality is rare: some topological properties of causal quantum channels
Robin Simmons
Sorkin's impossible operations demonstrate that causality of a quantum channel in QFT is an additional constraint on quantum operations above and beyond the locality of the channel…
quant-ph2024
Classical-to-quantum non-signalling boxes
Carolina Moreira Ferrera, Robin Simmons, James Purcell +2
Here we introduce the concept of classical input - quantum output (C-Q) non-signalling boxes, a generalisation of the classical input - classical output (C-C) non-signalling boxes.…