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On unorthodox qubits, with an application to the closed timelike curve problem

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arxiv 2205.02797 v1 pith:RA6PXZNT submitted 2022-05-05 quant-ph

On unorthodox qubits, with an application to the closed timelike curve problem

classification quant-ph
keywords quantumtheoryclosedconstrainttimelikeunorthodoxcommutationcurves
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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