We utilize a superconducting qubit processor to experimentally probe non-Markovian dynamics of an entangled qubit pair. 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 an auxiliary transmon qubit coupled to its readout cavity. We observe the collapse and revival of the entanglement as a signature of quantum memory effects in the environment. We then engineer the non-Markovianity of the environment by populating its readout cavity with thermal photons to show a transition from non-Markovian to Markovian dynamics, ultimately reaching a regime where the quantum Zeno effect creates a decoherence-free subspace that effectively stabilizes the entanglement between the qubits.

中文翻译：

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开放量子系统动力学中非马尔可夫到马尔可夫转变的纠缠辅助探测

我们利用超导量子位处理器来实验性地探测纠缠量子位对的非马尔可夫动力学。我们在两个量子位之间准备一个纠缠态，并随着其中一个量子位与一个由与其读出腔耦合的辅助传输量子位组成的小量子环境相互作用而监测纠缠随时间的演变。我们观察到纠缠的崩溃和复活是环境中量子记忆效应的标志。然后，我们通过用热光子填充其读出腔来设计环境的非马尔可夫性，以显示从非马尔可夫动力学到马尔可夫动力学的转变，最终达到量子芝诺效应创建无退相干子空间的状态，从而有效地稳定纠缠量子位之间。