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Gaussian Matrix Product States
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We introduce Gaussian Matrix Product States (GMPS), a generalization of Matrix Product States (MPS) to lattices of harmonic oscillators. Our definition resembles the interpretation of MPS in terms of projected maximally entangled pairs, starting from which we derive several properties of GMPS, often in close analogy to the finite dimensional case: We show how to approximate arbitrary Gaussian states by MPS, we discuss how the entanglement in the bonds can be bounded, we demonstrate how the correlation functions can be computed from the GMPS representation, and that they decay exponentially in one dimension, and finally relate GMPS and ground states of local Hamiltonians.
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Cited by 1 Pith paper
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Gaussian-augmented bosonic matrix-product states: theory and applications
GA-BMPS unify Gaussian states and finite-dimensional MPS in one ansatz with closed-form expectation values and exact parent Hamiltonians.
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