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Thought Experiment: The Non-Determinism of the Past

IKE QD

Published Jan 1, 2026• 0 citations
Publisher

Abstract

We challenge the classical assumption that the past consists of fixed, determinate events. By applying the Heisenberg Uncertainty Principle and Time-Reversal Symmetry to the verification of historical data, we propose that the past exists as a probability distribution that remains "fuzzy" even after measured. We introduce the "Measurement Stacking" effect, where subsequent attempts to verify a past event amplify its inherent uncertainty. Furthermore, we argue that the act of remembering or accessing recorded data is itself a quantum interaction that re-disturbs the historical state, suggesting that as we move further back in time, the past becomes increasingly open to probabilistic interpretation.

DOI
10.17605/osf.io/6f59b

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We challenge the classical assumption that the past consists of fixed, determinate events. By applying the Heisenberg Uncertainty Principle and Time-Reversal Symmetry to the verification of historical data, we propose that the past exists as a probability distribution that remains "fuzzy" even after measured. We introduce the "Measurement Stacking" effect, where subsequent attempts to verify a past event amplify its inherent uncertainty. Furthermore, we argue that the act of remembering or accessing recorded data is itself a quantum interaction that re-disturbs the historical state, suggesting that as we move further back in time, the past becomes increasingly open to probabilistic interpretation.
We challenge the classical assumption that the past consists of fixed, determinate events.By applying the Heisenberg Uncertainty Principle and Time-Reversal Symmetry to theverification of historical data, we propose that the past exists as a probability distributionthat remains "fuzzy" even after measured. We introduce the "Measurement Stacking"effect, where subsequent attempts to verify a past event amplify its inherent uncertainty.Furthermore, we argue that the act of remembering or accessing recorded data is itself aquantum interaction that re-disturbs the historical state, suggesting that as we movefurther back in time, the past becomes increasingly open to probabilistic interpretation
The Heisenberg uncertainty principle is conventionally interpreted as a constraint on the precision of future measurement outcomes. We argue that this temporal asymmetry is not justified by the underlying mathematics of quantum mechanics, which is fundamentally time-symmetric. We propose that uncertainty applies equally in both temporal directions: the past has no greater ontological determinacy than the future. Between collapse events, prior states were no more determined than future states are now. Only the present moment of collapse constitutes anything approaching a definite physical state, and that moment is immediately receding into a past that was never fully determined before collapse occurred. We formalize this interpretation through a timesymmetric reading of the existing uncertainty relations and discuss its implications for the ontological status of the past, the measurement problem, and the foundations of physical determinism.
We propose a reformulation of quantum mechanics in which the distinction between definite and indefinite becomes the fundamental primitive. Inspired by suggestions of Heisenberg, Schrodinger and Dyson that the past can't be described in terms of wavefunctions and operators, so that the uncertainty principle does not apply to past events, we propose that the distinction between past, present and future is derivative of the fundamental distinction between indefinite and definite. %The same is the case for the quantum world versus classical world distinction of the Copenhagen interpretation. We then outline a novel form of presentism based on a phenomonology of events, where an event is defined as an instance of transition between indefinite and definite. Neither the past nor the future fully exist, but for different reasons. We finally suggest reformulating physics in terms of a new class of time coordinates in which the present time of a future event measures a countdown to the present moment in which that event will happen.
I discuss some of the main interpretations given to explain the indeterministic nature of quantum measurements and show that all has some loopholes in one corner or another. I propose an alternative interpretation based on the notion of continued re-creation of the physical properties. The rate at which the system is re-created is a measure of the determinism of the measurements. The existence of uncertainties is better explained through this view, the meaning of incompatible observables becomes clearer and with the notion of re-creation and the origin of the Heisenberg uncertainty principle becomes more vivid.
We argue that measurement data in quantum physics can be rigorously interpreted only as a result of a statistical, macroscopic process, taking into account the indistinguishable character of identical particles. Quantum determinism is in principle possible on the condition that a fully-fledged quantum model is used to describe the measurement device in interaction with the studied object as one system. In contrast, any approach that relies on Born's rule discriminates the dynamics of a quantum system from that of the detector with which it interacts during measurement. In this work, we critically analyze the validity of this measurement postulate applied to single-event signals. In fact, the concept of ``individual'' particle becomes inadequate once both indistinguishability and a scattering approach allowing an unlimited interaction time for an effective detection, are considered as they should be, hence preventing the separability of two successive measurement events. In this context, measurement data should therefore be understood only as a result of statistics over many events. Accounting for the intrinsic noise of the sources and the detectors, we also show with the illustrative cases of the Schrödinger cat and the Bell experiment that once the Born rule is abandoned on the level of a single particle, realism, locality and causality are restored. We conclude that indiscernibility and long-time detection process make quantum physics not fundamentally probabilistic.
The shift from classical deterministic prediction to quantum distributions does not by itself decide whether the real is intrinsically probabilistic. The argument begins with both the force and the limit of Laplace’s ideal: deterministic dynamics can coexist with incomplete knowledge of the initial conditions, and classical physics already employs probability. The uncertainty relation then requires a distinction between preparation uncertainty, measurement error, and disturbance, preventing a single formula from serving as an ontological verdict. Bell inequalities tighten the constraints by excluding a specific family of local explanations without ruling out deterministic nonlocal dynamics. The objectivity of probability therefore arises from the explanations that the distributions rule out, not from turning probability into substance. An unexpected detector pulse then allows us to follow the transition from a physical record to knowledge: the material configuration may persist while the act of discrimination is ephemeral; only recognition under a protocol requires a distinction between trace, singular inscription, passive mark, and symbol. Finally, the laser shows why technical fruitfulness increases a theory’s epistemic weight, even though rival ontologies may share the same formalism. The remaining interpretative openness is not arbitrary: it is bounded by results that any future account must accommodate.