Temperature estimation in a quantum spin bath through entangled and separable two-qubit probes Lionel Tenemeza Kenfack, William Degaulle Waladi Gueagni, Martin Tchoffo and Lukong Cornelius Fai Eur. Phys. J. Plus, 136 2 (2021) 220 Published online: 16 February 2021 DOI: 10.1140/epjp/s13360-021-01180-x