Detecting quantum critical points at finite temperature via quantum teleportation: further models
arXiv:2311.00105 · doi:10.1103/PhysRevA.109.012612
Abstract
In [Phys. Rev. A 107, 052420 (2023)] we showed that the quantum teleportation protocol can be used to detect quantum critical points (QCPs) associated with a couple of different classes of quantum phase transitions, even when the system is away from the absolute zero temperature (T=0). Here, working in the thermodynamic limit (infinite chains), we extend the previous analysis for several other spin-1/2 models. We investigate the usefulness of the quantum teleportation protocol to detect the QCPs of those models when the temperature is either zero or greater than zero. The spin chains we investigate here are described by the XXZ model, the XY model, and the Ising model, all of them subjected to an external magnetic field. Specifically, we use a pair of nearest neighbor qubits from an infinite spin chain at thermal equilibrium with a reservoir at temperature T as the resource to execute the quantum teleportation protocol. We show that the ability of this pair of qubits to faithfully teleport an external qubit from the chain is dramatically affected as we cross the QCPs related to the aforementioned models. The results here presented together with the ones of [Phys. Rev. A 107, 052420 (2023)] suggest that the quantum teleportation protocol is a robust and quite universal tool to detect QCPs even when the system of interest is far from the absolute zero temperature.
arXiv comment15 pages, 23 figures, double column, RevTex4; v2: published version
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