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On unorthodox qubits, with an application to the closed timelike curve problem
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In orthodox quantum theory the observables of spacelike separated quantum systems commute. I shall call this the commutation constraint. It severely limits quantum theory's explanatory power. For instance, the constraint cannot be met in the presence of closed timelike curves, leaving us with no choice but to rule them out by fiat. It also conflicts with Bekenstein's bound. Here I investigate a modified quantum theory, unorthodox quantum theory, which is different from the conventional theory only in its omission of this commutation constraint. In particular, I describe a system of unorthodox qubits and demonstrate how they can be used to model systems on closed timelike curves and how they allow for a solution of the grandfather paradox.
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Cited by 1 Pith paper
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Entangling Disciplines: Causality, Entropy and Time-Travel Paradoxes on a Quantum Computer
A pedagogical paper presents quantum circuit activities for teaching no-signalling, Landauer erasure, and closed-timelike-curve computational power, drawing content from known results.
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