Entanglement assisted probe of the non-Markovian to Markovian transition in open quantum system dynamics

We utilize a superconducting qubit processor to experimentally probe the transition from non-Markovian to Markovian dynamics of an open quantum system. We prepare an entangled state between two qubits and monitor the evolution of entanglement over time as one of the qubits interacts with a small quantum environment consisting of a third noisy qubit. We observe the collapse and revival of the entanglement as a signature of quantum memory effects in the environment. We then engineer the quantum memory lifetime to study the transition between non-Markovian and Markovian dynamics, where the environment behaves respectively as a quantum and classical memory.