TY - JOUR A1 - Palm, Timo A1 - Nalbach, Peter T1 - Suppressing relaxation through dephasing T2 - Physical Review A. Atomic, molecular, and optical physics N2 - We study the nonequilibrium dynamics of a quantum system under the influence of two noncommuting fluctuation sources, i.e., purely dephasing fluctuations and relaxational fluctuations. We find that increasing purely dephasing fluctuations suppress increasing relaxation in the quantum system. This effect is further enhanced when both fluctuation sources are fully correlated. These effects arise for medium to strong primary fluctuations already when the secondary fluctuations are weak due to their noncommuting coupling to the quantum system. Dephasing, in contrast, is increased by increasing any of the two fluctuations. Fully correlated fluctuations result in overdamping at much lower system-bath coupling than uncorrelated noncommuting fluctuations. In total, we observe that treating subdominant secondary environmental fluctuations perturbatively leads, as neglecting them, to erroneous conclusions. KW - quantum dissipation KW - noncommuting fluctuations Y1 - 2021 UR - https://whge.opus.hbz-nrw.de/frontdoor/index/index/docId/4079 SN - 2469-9926 VL - 103 IS - 2 SP - Artikelnr. 022206 ER -