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Quantum Simulation

The Exact Uncertainty Relation and Geometric Speed Limits in Krylov Space

arXiv
Authors: Mohsen Alishahiha, Souvik Banerjee

Year

2025

Paper ID

36321

Status

Preprint

Abstract Read

~2 min

Abstract Words

102

Citations

N/A

Abstract

We show that Hall's exact uncertainty relation acquires a simple geometric form in the Krylov basis generated by the Liouvillian. In this canonical operator frame, the uncertainty equality implies that the operator amplitude vector evolves on the unit Krylov sphere with constant speed fixed solely by the first Lanczos coefficient. This yields an exact linear bound on geometric operator evolution, independent of higher Lanczos coefficients and valid for arbitrary Hamiltonians, integrable or chaotic. Our results provide the first unified geometric interpretation of exact quantum speed limits and operator growth, identifying the first Lanczos coefficient as the intrinsic speed scale of quantum dynamics.

Why This Paper Matters

  • This paper contributes to the Quantum Simulation research area in the Quantum Articles archive.
  • It adds a 2025 reference point for readers tracking recent quantum research.
  • We show that Hall's exact uncertainty relation acquires a simple geometric form in the Krylov basis generated by the Liouvillian.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2512.20359 [2] arXiv https://arxiv.org/abs/2512.20359 [3] Publisher https://arxiv.org/abs/2512.20359

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