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We utilize a superconducting qubit processor to experimentally probe thetransition from non-Markovian to Markovian dynamics of an entangled qubit pair.We prepare an entangled state between two qubits and monitor the evolution ofentanglement over time as one of the qubits interacts with a small quantumenvironment consisting of an auxiliary transmon qubit coupled to its readoutcavity. We observe the collapse and revival of the entanglement as a signatureof quantum memory effects in the environment. We then engineer thenon-Markovianity of the environment by populating its readout cavity withthermal photons to show a transition from non-Markovian to Markovian dynamics,reaching a regime where the quantum Zeno effect creates a decoherence-freesubspace that effectively stabilizes the entanglement between the qubits.

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