Control of dephasing in rotationally hot molecules

Coherent rovibrational revivals in a thermal molecular ensemble

“…(1)(2)(3)(4)(5). The coherence between v = 0 and v = v 1 levels in the vibrational density matrix evolves as…”

“…Coupling of a quantum system to an external environment leads to a loss of coherence between the eigenstates of the system, and therefore to a loss of information [1][2][3][4][5]. For all processes that rely on coherent dynamics, it is of general interest to understand the evolution of an open system and to minimize the decoherence effects (the general topic of decoherence is covered in a number of recent reviews [3,6]).…”

“…Controllability of molecular dynamics in the presence of coupling to the environment has been a subject of thorough study and debate [1,8,9]. The ability to control decoherence is important in the field of quantum information and quantum computation [3,19,20].…”

“…The ability to control decoherence is important in the field of quantum information and quantum computation [3,19,20]. Different approaches to controlling decoherence have been suggested, including phase-only control [1], feedback control [7], gen-eration of decoherence free subspaces [19] and suppression of decoherence by means of nonlinear resonances [8]. Methods of adaptive coherent control [21] have been implemented to inhibit dephasing in small molecules [9] and molecules as complex as proteins [22].…”

“…Diatomic molecules represent one of the most studied quantum systems exhibiting revivals and decoherence due to the molecular rotation. Extensive studies have been carried out on the rotational revivals [12][13][14], as well as the dephasing of the molecular vibration due to the rovibrational coupling to the bath of many thermally populated rotational states [1,9,15]. The mathematical description of the ro-vibrational dephasing on a short time scale is that of decoherence [2,15,16].…”