Prediction of the relaxation time of a transmon qubit with the steepest-entropy-ascent quantum thermodynamics framework

Abstract Decoherence has been observed to be one of the main limitations to build a practical quantum computer. This is because the qubits that conform it rapidly lose the entanglement and correlations existent among them due to interactions with the environment. In this work, the relaxation time of a Transmon qubit interacting with an environment is predicted by using the steepest-entropy-ascent quantum thermodynamics framework and the Lindblad master equation. For the study it is considered that the environment behaves as a thermal bath composed of a collection of harmonic oscillators. Results show that the qubit processes from a non-equilibrium state to a state of stable equilibrium, exchanging energy with the thermal bath during the process. In addition, the prediction of the relaxation time of the qubit is in agreement with experimental results obtained from the literature. The decoherence time is also accurately predicted by the models.