The generation of long-lived entanglement in optical atomic clocks is one of the main goals of quantum metrology. Arrays of neutral atoms, where Rydberg-based interactions may generate entanglement between individually controlled and resolved atoms, constitute a promising quantum platform to achieve this. Here we leverage the programmable state preparation afforded by optical tweezers and the efficient strong confinement of a three-dimensional optical lattice to prepare an ensemble of strontium-atom pairs in their motional ground state. We engineer global single-qubit gates on the optical clock transition and two-qubit entangling gates via adiabatic Rydberg dressing, enabling the generation of Bell states with a state-preparation-and-measurement-corrected fidelity of 92.8(2.0)% (87.1(1.6)% without state-preparation-and-measurement correction). For use in quantum metrology, it is furthermore critical that the resulting entanglement be long lived; we find that the coherence of the Bell state has a lifetime of 4.2(6) s via parity correlations and simultaneous comparisons between entangled and unentangled ensembles. Such long-lived Bell states can be useful for enhancing metrological stability and bandwidth. In the future, atomic rearrangement will enable the implementation of many-qubit gates and cluster state generation, as well as explorations of the transverse field Ising model.

在光学原子钟中产生长寿命纠缠是量子计量学的主要目标之一。中性原子阵列，其中基于里德堡的相互作用可能会在单独控制和解析的原子之间产生纠缠，构成了实现这一目标的有希望的量子平台。在这里，我们利用光镊提供的可编程状态制备和三维光学晶格的有效强约束来制备处于运动基态的锶原子对集合。我们通过绝热里德堡敷料在光学时钟转换上设计全局单量子比特门和双量子比特纠缠门，从而能够生成具有 92.8(2.0)% (87.1(87.1) 的状态准备和测量校正保真度的贝尔态1.6)% 无状态准备和测量校正)。对于在量子计量学中的使用，产生的纠缠长期存在也是至关重要的。我们发现贝尔状态的相干性通过奇偶相关性和纠缠和非纠缠系综之间的同时比较具有 4.2(6) 秒的寿命。这种长期存在的贝尔状态可用于提高计量稳定性和带宽。未来，原子重排将使多量子门和簇状态生成的实现，以及对横向场伊辛模型的探索成为可能。这种长期存在的贝尔状态可用于提高计量稳定性和带宽。未来，原子重排将使多量子门和簇状态生成的实现，以及对横向场伊辛模型的探索成为可能。这种长期存在的贝尔状态可用于提高计量稳定性和带宽。未来，原子重排将使多量子门和簇状态生成的实现，以及对横向场伊辛模型的探索成为可能。