Testing bosonic and fermionic Gaussian states with a constant number of copies

Abstract:Bosonic and fermionic Gaussian quantum states are families of quantum states that play a central role in quantum physics and quantum information processing. We study the problem of testing whether a given state is either Gaussian, or has bounded overlap with any Gaussian state. Previous analyses of this testing problem led to tests that require a number of copies of the state that scales with the number of modes (the system size). In this work we show that a constant number of copies of the state suffices. We derive these results based on the symmetries of identical copies of Gaussian states, and by bounding the distance to the set of Gaussian states through a gradient flow and a spectral bound studied previously for the Kac random walk on a sphere.

arXiv:2610.06794 [quant-ph]

(or arXiv:2610.06794v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.06794 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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