Generic signalling-free white-noise limit for models of spontaneous unitarity violation

• URL: http://arxiv.org/abs/2405.01077v1
• Date: Thu, 2 May 2024 08:14:43 GMT
• Title: Generic signalling-free white-noise limit for models of spontaneous unitarity violation
• Authors: Aritro Mukherjee, Jasper van Wezel,
• Abstract summary: We show the existence of a generic physical white noise limit for models of spontaneous unitarity violation applicable to any initial state. In this limit, the emergence of Born rule statistics is enforced by a fluctuation-dissipation relation.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Objective collapse theories propose modifications to Schr\"odinger's equation that solve the quantum measurement problem by interpolating between microscopic quantum dynamics and projective evolution of macroscopic objects. Objective collapse theories extending the equilibrium description of spontaneous symmetry breaking to spontaneous violations of unitarity in quantum dynamics were recently shown to possess a physical white noise limit when applied to initial two-state superpositions. Here, we show the existence of a generic physical white noise limit for models of spontaneous unitarity violation applicable to any initial state. We show that in this limit, the emergence of Born rule statistics is enforced by a fluctuation-dissipation relation, and that the ensemble averaged probability densities follow the GKSL master equation corresponding to a linear quantum semi-group, guaranteeing the absence of superluminal signalling.

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