München 2019 – wissenschaftliches Programm
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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik
MP 14: Posters (Montag - Donnerstag)
MP 14.5: Poster
Freitag, 22. März 2019, 09:00–09:00, HS 23
Decoherence of quantum registers — •Javeria Khan1, Imran Ahmed Siddiqui2, and Piero Nicolini3 — 1Goethe-Universität Frankfurt am Main. — 2University of Karachi, Pakistan — 3Goethe-Universität Frankfurt am Main, Germany
This study is motivated by the observation (widely believed but unproven) that classical systems cannot simulate highly entangled quantum systems efficiently, and we hope to hasten the day when well controlled quantum systems can perform tasks surpassing what can be done in the classical world. To operate a large scale quantum computer reliably we will need to overcome the debilitating effects of decoherence, Starting from the dynamical evolution of a quantum register of arbitrary length coupled to an environment of arbitrary coherence length is predicted within a relevant model of decoherence. We have revisited a model of decoherence based upon the one previously studied by Leggett in connection with tunneling problem in the presence of dissipation. The results are reported for both independent decoherence and collective decoherence, for both cases explicit decoherence functions are derived and it is shown that the decay of the coherences of the register is strongly depend on the input state. Our results lead to the identification of decoherence free states in the collective decoherence limit. Only by challenging the entanglement frontier and by tackling decoherence we will learn whether Nature provides extravagant resources far beyond what the classical world would allow. Keywords: decoherence, entangled, evolution, states.