Observation of universal dissipative dynamics in strongly correlated quantum gas

Dissipation is unavoidable in quantum systems and it usually induces decoherence. Nevertheless, we find contrary effects that dissipation can not only be utilized as a power tool to probe the intrinsic correlations of quantum many-body systems, but also introduce coherent dynamics. For the former, we observe a universal and unconventional stretched-exponential dissipative dynamics when applying highly-controllable dissipation on strongly correlated one-dimensional quantum gases. The stretched exponent directly measures the anomalous dimension of the single-particle spectral function, which characterizes the strong quantum fluctuation of this system. For the latter, we observe a dissipation-induced coherent conversion between the condensate component and the non-condensate one in a three-dimensional partial condensate atomic ensemble trapped in a harmonic trap, of which the oscillation behavior depends on the trap vibrational frequency and the condensation fraction. These works could open a completely new avenue to detect and discover correlated and coherent features in quantum many-body systems beyond the current Hermitian boundaries.