title: Decoherence control by quantum decoherence itself.
abstract: We propose a general approach of protecting a two-level system against decoherence via quantum engineering of non-classical multiple superpositions of coherent states in a non-Markovian reservoir. The scheme surprisingly only uses the system-environment interaction responsible for the decoherence and projective measurements of the two-level system. We demonstrate the method on the example of an excitonic qubit in self-assembled semiconductor quantum dots coupled to the super-Ohmic reservoir of acoustic phonons.
authors.affiliation: 1] Department of Theoretical Physics, Wrocław University of Technology, 50-370 Wrocław, Poland [2] Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Roszak
authors.affiliation: Department of Optics, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.
authors.forename: Radim
authors.initials: R
authors.lastname: Filip
authors.affiliation: Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic.
authors.forename: Tomáš
authors.initials: T
authors.lastname: Novotný