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quant-ph2026
Operationalism, Causality, and Quantum Theory: a mostly time symmetric perspective
Lucien Hardy
This is a book about operational probabilistic theories. The standard approach in such theories is from a time forward perspective. In this book we mostly take a time symmetric per…
quant-ph2024
A diagrammatic language for the Causaloid framework
Nitica Sakharwade, Lucien Hardy
The Causaloid framework is an operational approach aimed to house both the radical aspects of General Relativity -- dynamic causal structure, and Quantum Theory -- indefiniteness,…
quant-ph2024
Indefinite Causal Structure and Causal Inequalities with Time-Symmetry
Luke Mrini, Lucien Hardy
Time-reversal symmetry is a prevalent feature of microscopic physics, including operational quantum theory and classical general relativity. Previous works have studied indefinite…