2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22746We present a new readout method for a superconducting flux qubit, based on the measurement of the Josephson inductance of a superconducting quantum interference device that is inductively coupled to the qubit. The intrinsic flux detection efficiency and back-action are suitable for a fast and nondestructive determination of the quantum state of the qubit, as needed for readout of multiple qubits in a quantum computer. We performed spectroscopy of a flux qubit and we measured relaxation times of the order of 80 $μs$.4 pages, 4 figures; modified content, figures and references; accepted for publication in Phys. Rev. LettSuperconductivityMesoscale and Nanoscale PhysicsQuantum Physicstext