Classical restrictions of generic matrix product states are quasi-locally Gibbsian

• URL: http://arxiv.org/abs/2010.11643v2
• Date: Fri, 17 Sep 2021 14:15:16 GMT
• Title: Classical restrictions of generic matrix product states are quasi-locally Gibbsian
• Authors: Yaiza Aragon\'es-Soria, Johan {\AA}berg, Chae-Yeun Park, and Michael J. Kastoryano
• Abstract summary: We show that the norm squared amplitudes with respect to a local orthonormal basis (the classical restriction) of finite quantum systems can be exponentially well approximated by Gibbs states of local Hamiltonians. For injective matrix product states, we moreover show that the classical CMI decays exponentially, whenever the collection of matrix product operators satisfies a 'purity condition'
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We show that the norm squared amplitudes with respect to a local orthonormal basis (the classical restriction) of finite quantum systems on one-dimensional lattices can be exponentially well approximated by Gibbs states of local Hamiltonians (i.e., are quasi-locally Gibbsian) if the classical conditional mutual information (CMI) of any connected tripartition of the lattice is rapidly decaying in the width of the middle region. For injective matrix product states, we moreover show that the classical CMI decays exponentially, whenever the collection of matrix product operators satisfies a 'purity condition'; a notion previously established in the theory of random matrix products. We furthermore show that violations of the purity condition enables a generalized notion of error correction on the virtual space, thus indicating the non-generic nature of such violations. We make this intuition more concrete by constructing a probabilistic model where purity is a typical property. The proof of our main result makes extensive use of the theory of random matrix products, and may find applications elsewhere.

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