A precise time-dependent control of a quantum system relies on an accurate account of the quantum interference among the system, the control, and the environment. A diagrammatic technique has been recently developed to precisely calculate this quantum correlation for a fast multimode coherent photon control against slow relaxation, valid for both Markovian and non-Markovian systems. We review this formalism in comparison with the existing approximate theories and extend it to cases with controls by photon state other than the coherent state.
© 2012 Optical Society of America
Original Manuscript: October 4, 2011
Manuscript Accepted: October 27, 2011
Published: January 25, 2012
Ching-Kit Chan and L. J. Sham, "Quantum correlation of an optically controlled quantum system," J. Opt. Soc. Am. B 29, A25-A30 (2012)