A Variational Ansatz for the Ground State of the Quantum
Sherrington-Kirkpatrick Model
- URL: http://arxiv.org/abs/2204.02923v2
- Date: Fri, 11 Nov 2022 12:36:14 GMT
- Title: A Variational Ansatz for the Ground State of the Quantum
Sherrington-Kirkpatrick Model
- Authors: Paul M. Schindler, Tommaso Guaita, Tao Shi, Eugene Demler and J.
Ignacio Cirac
- Abstract summary: We present an ansatz for the ground states of the Quantum Sherrington-Kirkpatrick model.
We find that the ground state entanglement can be captured by a simple ensemble of weighted graph states with normally distributed phase gates.
- Score: 1.2599533416395767
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: We present an ansatz for the ground states of the Quantum
Sherrington-Kirkpatrick model, a paradigmatic model for quantum spin glasses.
Our ansatz, based on the concept of generalized coherent states, very well
captures the fundamental aspects of the model, including the ground state
energy and the position of the spin glass phase transition. It further enables
us to study some previously unexplored features, such as the non-vanishing
longitudinal field regime and the entanglement structure of the ground states.
We find that the ground state entanglement can be captured by a simple ensemble
of weighted graph states with normally distributed phase gates, leading to a
volume law entanglement, contrasting with predictions based on entanglement
monogamy.
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