Preprints

    1 a 3 de 3 Preprints encontradas Ano: 2019

  • Continuous monitoring of energy in quantum open systems
    G. P. Martins, N. K. Bernardes, M. F. Santos

    We propose a method to continually monitor the energy of a quantum system. We show that by having some previous knowledge of the system’s dynamics, but not all of it, one can use the measured energy to determine many other quantities, such as the work performed on the system, the heat exchanged between the system and a thermal reservoir, the time dependence of the Hamiltonian of the system as well as the total entropy produced by its dynamics. We have also analyzed how this method is dependent on the quality factor of the measurements employed.

  • Inducing nontrivial qubit coherence through a controlled dispersive environment
    Wallace S. Teixeira, Fernando Nicacio, Fernando L. Semião

    We show how the dispersive regime of the Jaynes-Cummings model may serve as a valuable tool to the study of open quantum systems. We employ it in a bottom-up approach to build an environment that preserves qubit energy and induces varied coherence dynamics. We then present the derivation of a compact expression for the qubit coherence, applied here to the case of a finite number of thermally populated modes in the environment. We also discuss how the model parameters can be adjusted to facilitate the production of short-time monotonic decay (STMD) of the qubit coherence. Our results provide a broadly applicable platform for the investigation of energy-conserving open system dynamics which is fully within the grasp of current quantum technologies.

  • A definition of Quantum Mechanical Work
    Thales A. B. Pinto Silva