2026-10-28 · arXiv Quantum Physics
arXiv:2610.36156v1 Announce Type: new
Abstract: Can the entanglement of an arbitrary many-body state be quantified without reconstructing the state? We answer the question affirmatively by showing how the measure of logarithmic negativity can be estimated using a finite number of even partial transpose (PT) moments of a many-body state. Considering the squared PT spectrum as a probability measure, we solve exactly the task of a truncated Hausdorff moment problem with Gauss and Gauss-Radau quadrature. We obtain a hierarchy of lower bounds on the logarithmic negativity, which improves with increasing order of moments. Convergence to the exact value of the measure can be achieved for every state of finite dimension. We illustrate the bounds for ground states of three different interacting spin models, as well as for a thermal state. An error analysis demonstrates the efficacy of our scheme towards handling the limitation of finite statistics encountered in actual experiments with randomized measurements. Moreover, an example of density matrix renormalization group based numerical estimation is provided for handling system sizes beyond the scope of exact diagonalization.
原文链接：https://arxiv.org/abs/2610.36156
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