Experimental emulation of quantum non-Markovian dynamics and coherence protection in the presence of information backflow

摘要: We experimentally emulate, in a controlled fashion, the non-Markovian dynamics of pure dephasing spin-boson model at zero temperature. Specifically, we use randomized set external radio-frequency fields to engineer desired noise power spectrum effectively realize environment for single NMR qubit. The information backflow, characteristic non-Markovianity, is captured nonmonotonicity decoherence function and von Neumann entropy system. Using such emulated environments, study efficiency Carr-Purcell-Meiboom-Gill dynamical decoupling (DD) sequence inhibit loss coherence. filter formalism, design optimized DD sequences that maximize coherence protection environments their efficiencies experimentally. Finally, discuss DD-assisted tuning effective non-Markovianity.