标题： 三量子比特量子引力诱导质量纠缠（QGEM）中三重纠缠随量子退相干的演化 显示英文标题

标题： Evolution of tripartite entanglement in three-qubit Quantum Gravity-Induced Entanglement of Masses (QGEM) with quantum decoherence

摘要： 最近引入的由量子引力引起的质量纠缠（QGEM）协议旨在通过观察两个空间叠加质量之间虚拟引力子交换产生的纠缠来测试引力的量子性质。 在原始提议之后，很快提出了对该实验的进一步改进，包括添加第三个质量，表明三量子比特设置在抵抗由系统与环境相互作用引起的较高退相干率方面更加稳健。 在本工作中，我们研究了在考虑退相干效应时，在这些三量子比特QGEM实验中生成的三重纠缠类型。 我们表明，量子比特之间的引力相互作用能够在它们之间产生真实的三重纠缠，研究相应的参数空间，并比较三个量子比特可能的实验配置在通过纠缠观测器检测真实纠缠方面的性能。 显示英文摘要

摘要： The recently introduced quantum gravity-induced entanglement of masses (QGEM) protocol aims to test the quantum nature of gravity by witnessing the entanglement produced by the virtual exchange of a graviton between two spatially superposed masses. Shortly after the original proposal, further improvements upon the experiment were suggested, including the addition of a third mass, showing that three-qubit setups can be more resilient to higher rates of decoherence caused by the interaction of the system with the environment. In this work, we investigate the type of tripartite entanglement generated in these three-qubit QGEM experiments when considering the effects of decoherence. We show that the gravitational interaction between the qubits is able to generate genuine tripartite entanglement between them, studying the corresponding parameter spaces and comparing the performance of the possible experimental configurations of the three qubits at allowing for the detection of genuine entanglement via an entanglement witness.