Work

Brute-force positivization of the ground states of the J 1 − J 2 model

Year: 2026

Type: article

Abstract: Exploring sign structures of quantum wave functions attracts considerable attention due to the potential for advances in modeling complex phases of matter. This stimulates developing different optimization procedures for imitating and manipulating sign structures of quantum states. In this work, utilizing a brute force approach based on a set of single-qubit transformations we evaluate protocols enabling positivization of the one-dimensional $J_1 -J_2$ model ground states in the regime of strong frustration. Based on the obtained positivization results, we show the difference between the cases of periodic and open boundary conditions, and also establish the dependence of the sign structure on parity of the simulated spin chains.

Source: Physical review. B./Physical review. B

DOI: 10.1103/r75d-zhkz

Authors: P. A. Bannykh, O. M. Sotnikov, V. V. Mazurenko

Institutions: Ural Federal University, Russian Quantum Center

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Ministry of Science and Higher Education of the Russian Federation

Award: G7943792970