- freely available
Energy Transfer Using Unitary Transformations
AbstractWe study the unitary time evolution of a simple quantum Hamiltonian describing two harmonic oscillators coupled via a three-level system. The latter acts as an engine transferring energy from one oscillator to the other and is driven in a cyclic manner by time-dependent external fields. The S-matrix (scattering matrix) of the cycle is obtained in analytic form. The total number of quanta contained in the system is a conserved quantity. As a consequence, the spectrum of the S-matrix is purely discrete, and the evolution of the system is quasi-periodic. The explicit knowledge of the S-matrix makes it possible to do accurate numerical evaluations of the time-dependent wave function. They confirm the quasi-periodic behavior. In particular, the energy flows back and forth between the two oscillators in a quasi-periodic manner.
Share & Cite This Article
de Galway, W.O.; Naudts, J. Energy Transfer Using Unitary Transformations. Entropy 2013, 15, 5121-5143.View more citation formats
de Galway WO, Naudts J. Energy Transfer Using Unitary Transformations. Entropy. 2013; 15(12):5121-5143.Chicago/Turabian Style
de Galway, Winny O.; Naudts, Jan. 2013. "Energy Transfer Using Unitary Transformations." Entropy 15, no. 12: 5121-5143.