论文标题
在原子动量空间中，平均时间对称性破坏过渡的量子zeno效应
Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
论文作者
论文摘要
我们在平均时间（PT）对称冷原子气体中实验研究量子Zeno效应，并定期与储层结合。基于动量晶格中原子相结合的最新控制，我们在两个晶格位点实现了一个合成的两级系统，具有被动的PT对称性，在此，通过重复耦合到其余的晶格中，通过重复耦合引入有效的耗散。量子Zeno（反Zeno）效应在我们的实验中表现出来，因为随着耦合强度或频率的增加，两级系统的总体耗散被抑制（增强）。我们证明，量子Zeno机制存在于断裂的PT对称阶段，并通过将PT对称相和PT破碎相的特殊点以及一组离散的临界耦合频率组成。我们的实验确定了PT对称性的过渡和量子Zeno效应之间的联系，并且由于具有动量晶格中原子的灵活控制，可以扩展到更高的维度或相互作用的态度。
We experimentally study quantum Zeno effects in a parity-time (PT) symmetric cold atom gas periodically coupled to a reservoir. Based on the state-of-the-art control of inter-site couplings of atoms in a momentum lattice, we implement a synthetic two-level system with passive PT symmetry over two lattice sites, where an effective dissipation is introduced through repeated couplings to the rest of the lattice. Quantum Zeno (anti-Zeno) effects manifest in our experiment as the overall dissipation of the two-level system becoming suppressed (enhanced) with increasing coupling intensity or frequency. We demonstrate that quantum Zeno regimes exist in the broken PT symmetry phase, and are bounded by exceptional points separating the PT symmetric and PT broken phases, as well as by a discrete set of critical coupling frequencies. Our experiment establishes the connection between PT-symmetry-breaking transitions and quantum Zeno effects, and is extendable to higher dimensions or to interacting regimes, thanks to the flexible control with atoms in a momentum lattice.
