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arXiv · 2405.02214

Natural disorder distributions from measurement

Šárka Blahnik·Sarah Shandera
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Abstract

We consider scenarios where the dynamics of a quantum system are partially determined by prior local measurements of some interacting environmental degrees of freedom. The resulting effective system dynamics are described by a disordered Hamiltonian, with spacetime-varying parameter values drawn from distributions that are generically neither flat nor Gaussian. This class of scenarios is a natural extension of those where a fully non-dynamical environmental degree of freedom determines a universal coupling constant for the system. Using a family of quasi-exactly solvable anharmonic oscillators, we consider environmental ground states of nonlinearly coupled degrees of freedom, unrestricted by a weak coupling expansion, which include strongly quantum non-Gaussian states. We derive the properties of distributions for both quadrature and photon number measurements. Measurement-induced disorder of this kind is likely realizable in laboratory quantum systems and, given a notion of naturally occurring measurement, suggests a new class of scenarios for the dynamics of quantum systems in particle physics and cosmology.

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Šárka Blahnik, Sarah Shandera. 2024-05-03. Natural disorder distributions from measurement. https://arxiv.org/abs/2405.02214

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