Quantum computation of magnon spectra
Akhil Francis, J. K. Freericks, A. F. Kemper
Abstract
We demonstrate quantum computation of two-point correlation functions for a Heisenberg spin chain. Using the IBM Q 20-qubit quantum machines, we find that, for two sites, the correlation functions produce the exact results reliably. For four sites, results from the IBM Q 20-qubit Tokyo quantum computer are noisy due to read out errors and decoherence. Nevertheless, the correlation functions retain the correct spectral information. This is illustrated in the frequency domain by accurately extracting the magnon energies from peaks in the spectral function.
Topics & Concepts
MagnonSpectral lineComputationPhysicsQuantumQuantum mechanicsStatistical physicsTheoretical physicsComputer scienceAlgorithmFerromagnetismQuantum Computing Algorithms and ArchitectureQuantum and electron transport phenomenaQuantum Information and Cryptography