Nonexponential Decoherence and Subdiffusion in Atom-Optics Kicked Rotor.
Nonexponential Decoherence and Subdiffusion in Atom-Optics Kicked Rotor.
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DOI：
10.1103/physrevlett.118.174101
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发表时间：
2016-07
影响因子：
8.6
通讯作者：
S. Sarkar;Sanku Paul;Chetan Vishwakarma;Sunil Kumar;G. Verma;M. Sainath;U. Rapol;M. S. Santhanam
中科院分区：
文献类型：
--
作者：
S. Sarkar;Sanku Paul;Chetan Vishwakarma;Sunil Kumar;G. Verma;M. Sainath;U. Rapol;M. S. Santhanam
量子系统在与环境相互作用时失去相干性，并倾向于经典状态。已知量子相干性随时间呈指数衰减，因此宏观量子叠加通常是不可持续的。在这项工作中，慢于指数衰减的相干性实验实现在原子光学踢转子系统受到非平稳Lévy噪声在应用踢序列。较慢的相干性衰减表现为量子次扩散的形式，可以通过Lévy指数来控制。实验结果与理论估算和数值模拟的结果吻合得很好。
Quantum systems lose coherence upon interaction with the environment and tend towards classical states. Quantum coherence is known to exponentially decay in time so that macroscopic quantum superpositions are generally unsustainable. In this work, slower than exponential decay of coherences is experimentally realized in an atom-optics kicked rotor system subjected to nonstationary Lévy noise in the applied kick sequence. The slower coherence decay manifests in the form of quantum subdiffusion that can be controlled through the Lévy exponent. The experimental results are in good agreement with the analytical estimates and numerical simulations for the mean energy growth and momentum profiles of an atom-optics kicked rotor.