Tunable Nonreciprocal Quantum Transport through a Dissipative Aharonov-Bohm Ring in Ultracold Atoms
Tunable Nonreciprocal Quantum Transport through a Dissipative Aharonov-Bohm Ring in Ultracold Atoms
复制标题
超冷原子中通过耗散阿哈罗诺夫-玻姆环的可调谐非互易量子传输
DOI：
10.1103/physrevlett.124.070402
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发表时间：
2020-02-20
影响因子：
8.6
通讯作者：
Yan, Bo
中科院分区：
文献类型：
--
作者：
Gou, Wei;Chen, Tao;Yan, Bo
我们报告了动量晶格中玻色-爱因斯坦凝聚体的可调谐、不可逆量子输运的实验观察。通过在动量空间中实现耗散阿哈罗诺夫-玻姆（AB）环并将原子发送通过它，我们通过测量不同时间凝聚态的动量分布来演示定向原子流。虽然耗散 AB 环的特点是通过环的合成磁通量及其上的激光引起的损耗，但原子流的传播方向和传输速率都敏感地取决于这些高度可调的参数。我们证明，非互易性源于合成磁通量和激光引起的损耗的相互作用，这同时打破了反转和时间反转对称性。我们的研究结果为研究冷原子中的不可逆动力学开辟了道路，并强调耗散 AB 环作为量子模拟和量子信息应用的灵活构建元件。
We report the experimental observation of tunable, nonreciprocal quantum transport of a Bose-Einstein condensate in a momentum lattice. By implementing a dissipative Aharonov-Bohm (AB) ring in momentum space and sending atoms through it, we demonstrate a directional atom flow by measuring the momentum distribution of the condensate at different times. While the dissipative AB ring is characterized by the synthetic magnetic flux through the ring and the laser-induced loss on it, both the propagation direction and transport rate of the atom flow sensitively depend on these highly tunable parameters. We demonstrate that the nonreciprocity originates from the interplay of the synthetic magnetic flux and the laser-induced loss, which simultaneously breaks the inversion and the time-reversal symmetries. Our results open up the avenue for investigating nonreciprocal dynamics in cold atoms, and highlight the dissipative AB ring as a flexible building element for applications in quantum simulation and quantum information.