Quantum Sensing and Hamiltonian Learning under Stochastic Parameter Evolution

Abstract:We introduce the notion of stochastically evolving Hamiltonians (SEHs), which are local Hamiltonians whose coefficients are governed by stochastic differential equations (SDEs). After developing some theoretical aspects of these objects, we consider the task of Hamiltonian learning for SEHs. We reanalyse and make necessary extensions to the Huang-Tong-Fang-Su protocol, which first achieved the Heisenberg limit for Hamiltonian coefficient learning, under these circumstances. We delineate theoretically the regimes where the Heisenberg limit can and cannot be retained. Along the way we develop a few tools in quantum sensing and Hamiltonian simulation that may be of independent interest under similar settings in quantum information processing. The broad aim is to encourage the exploration of various settings in quantum information processing in which the control parameters are governed by SDEs.

Comments most welcome!

arXiv:2609.39908 [quant-ph]

(or arXiv:2609.39908v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.39908 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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