So saying that Central Banks have kept down their benchmark interest rate close to zero or even negative for almost a decade in the aftermath of the crisis is actually quite misleading. The Fed, the ECB, and the BOJ really had no other choice than to reduce their benchmark rate to such low rates and to keep it there for many years as economic conditions simply did not warrant a premature tightening.
It is now quite clear that the US business cycle is in a more mature stage than the European recovery and economic conditions allowed the Fed to increase its interest rate to about 1.25% as of now. Moreover, financial markets are actually pricing in some 3 to 4 more rate hikes this year, meaning that interest rates will approach about 2% by the end of 2018 while they are effectively still below zero in Europe as of right now. However, as I have argued earlier, interest rates are partially determined by international factors and Eurozone interest rates cannot decouple forever. It seems quite likely that after the end of QE, which is supposedly ending in September of this year, the ECB will also be able to start its tightening cycle in 2019. Expect the Swedish Riksbank to follow the ECB's rate rate decision quite closely. To sum up, while Central Banks have quite powerful control of domestic nominal demand, i.e. NGDP, they actually have little control over real interest rates, which are endogenous to domestic and international macroeconomic conditions.