Quantum coherence in a compass chain under an alternating magnetic field

You, W.; Wang, Y.; Yi, T.; Zhang, C.; Oleś, A.

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Quantum coherence in a compass chain under an alternating magnetic field

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Wang, Y.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

Oleś, A.
Max Planck Society;

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You, W., Wang, Y., Yi, T., Zhang, C., & Oleś, A. (2018). Quantum coherence in a compass chain under an alternating magnetic field. Physical Review B, 97(22): 224420.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D434-8

Abstract

We investigate quantum phase transitions and quantum coherence in a quantum compass chain under an alternating transverse magnetic field. The model can be analytically solved by the Jordan-Wigner transformation and this solution shows that it is equivalent to a two-component one-dimensional (1D) Fermi gas on a lattice. We explore mutual effects of the staggered magnetic interaction and multisite interactions on the energy spectra and analyze the ground-state phase diagram. We use quantum coherence measures to identify the quantum phase transitions. Our results show that l(1) norm of coherence fails to detect faithfully the quantum critical points separating a gapped phase from a gapless phase, which can be pinpointed exactly by relative entropy of coherence. Jensen-Shannon divergence is somewhat obscure at exception points. We also propose an experimental realization of such a 1D system using superconducting quantum circuits.