Quantum annealing simulation of out-of-equilibrium magnetization in a spin-chain compound

• URL: http://arxiv.org/abs/2101.02769v1
• Date: Thu, 7 Jan 2021 21:27:23 GMT
• Title: Quantum annealing simulation of out-of-equilibrium magnetization in a spin-chain compound
• Authors: Andrew D. King, Cristian D. Batista, Jack Raymond, Trevor Lanting, Isil Ozfidan, Gabriel Poulin-Lamarre, Hao Zhang, Mohammad H. Amin
• Abstract summary: Geometrically frustrated spin-chain compounds such as Ca3Co2O6 exhibit extremely slow relaxation under a changing magnetic field. This work demonstrates the viability of dynamical as well as equilibrium studies of frustrated magnetism using large-scale programmable quantum systems.
• Score: 4.708182206008542
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Geometrically frustrated spin-chain compounds such as Ca3Co2O6 exhibit extremely slow relaxation under a changing magnetic field. Consequently, both low-temperature laboratory experiments and Monte Carlo simulations have shown peculiar out-of-equilibrium magnetization curves, which arise from trapping in metastable configurations. In this work we simulate this phenomenon in a superconducting quantum annealing processor, allowing us to probe the impact of quantum fluctuations on both equilibrium and dynamics of the system. Increasing the quantum fluctuations with a transverse field reduces the impact of metastable traps in out-of-equilibrium samples, and aids the development of three-sublattice ferrimagnetic (up-up-down) long-range order. At equilibrium we identify a finite-temperature shoulder in the 1/3-to-saturated phase transition, promoted by quantum fluctuations but with entropic origin. This work demonstrates the viability of dynamical as well as equilibrium studies of frustrated magnetism using large-scale programmable quantum systems, and is therefore an important step toward programmable simulation of dynamics in materials using quantum hardware.

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