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• W2158603912 abstract "Several algorithms have been proposed to calculate the spatial entanglement spectrum from high order R'enyi entropies and maximum entropy techniques. We present an alternative approach for computing the entanglement spectrum with quantum Monte Carlo for both continuum and lattice Hamiltonians. This method provides direct access to the matrix elements of the spatially reduced density matrix and we determine an estimator that can be used in variational Monte Carlo as well as other Monte Carlo methods. The algorithm is based on using a generalization of the swap operator, which can be extended to calculate a general class of density matrices that can include combinations of spin, space, particle, and even momentum degrees of freedom. We demonstrate the method by applying it to the ${mathrm{H}}_{2}$ and ${mathrm{N}}_{2}$ molecules and describe how the spatial entanglement spectrum encodes a covalent bond that includes all the many body correlations." @default.
• W2158603912 created "2016-06-24" @default.
• W2158603912 creator A5060286354 @default.
• W2158603912 creator A5065784246 @default.
• W2158603912 date "2014-08-28" @default.
• W2158603912 modified "2023-10-15" @default.
• W2158603912 title "Calculating the entanglement spectrum in quantum Monte Carlo with application to<i>ab initio</i>Hamiltonians" @default.
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• W2158603912 doi "https://doi.org/10.1103/physrevb.90.081116" @default.
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