Generalized Uncertainty Relation Between an Observable and Its Derivative

Tarek Yehia

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arXiv · 2502.19521

Generalized Uncertainty Relation Between an Observable and Its Derivative

Tarek Yehia

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Abstract

The generalized uncertainty connection between the fluctuations of a quantum observable and its temporal derivative is derived in this study, we demonstrate that the product of an observable's uncertainties and its time derivative is bounded by half the modulus of the expectation value of the commutator between the observable and its derivative, using the Cauchy Schwarz inequality and the standard definitions of operator variances. In order to connect the dynamical evolution of observables to their inherent uncertainties, we reformulate the bound in terms of a double commutator by expressing the derivative in terms of the Hamiltonian via the Heisenberg equation of motion. Next, we apply this generalized relation to a spin particle to demonstrate its usefulness in a magnetic field that changes over time, and expand the study to include observables that have a clear temporal dependence. Our findings provide greater understanding of quantum dynamics and the influence of time-dependent interactions on measurement precision in addition to recovering the traditional uncertainty relations for static systems.

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Tarek Yehia. 2025-08-25. Generalized Uncertainty Relation Between an Observable and Its Derivative. https://arxiv.org/abs/2502.19521

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