title: Laser phase modulation approaches towards ensemble quantum computing.
abstract: Selective control of decoherence is demonstrated for a multilevel system by generalizing the instantaneous phase of any chirped pulse as individual terms of a Taylor series expansion. In the case of a simple two-level system, all odd terms in the series lead to population inversion, while the even terms lead to self-induced transparency. These results also hold for multiphoton transitions that do not have any lower-order photon resonance or any intermediate virtual state dynamics within the laser pulse width. Such results form the basis of a robustly implementable CNOT gate.
authors: Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India.
authors: Debabrata
authors: D
authors: Goswami