Quantum Rabi Oscillations in Coherent and in Mesoscopic Cat Field States
Quantum Rabi Oscillations in Coherent and in Mesoscopic Cat Field States
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DOI：
10.1103/physrevlett.123.143605
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发表时间：
2019-10-02
影响因子：
8.6
通讯作者：
Gleyzes, S.
中科院分区：
文献类型：
--
作者：
Assemat, F.;Grosso, D.;Gleyzes, S.
单模相干场中二能级系统的简单共振拉比振荡在介观尺度上显示出复杂的特征，振荡有崩塌和恢复。利用慢圆形里德伯原子与超导微波腔的相互作用，我们在前所未有的相互作用时间和光子数范围内探索了这种现象。我们证明了cat态的有效产生，这是几十个光子范围内具有几乎相反相位和大小的相干分量的量子叠加。我们测量了它们的维格纳函数的切割，揭示了它们的量子相干性，并观察了它们的快速退相干。该实验为腔和电路量子电动力学中非经典态的快速生成和操纵开辟了有希望的前景。
The simple resonant Rabi oscillation of a two-level system in a single-mode coherent field reveals complex features at the mesoscopic scale, with oscillation collapses and revivals. Using slow circular Rydberg atoms interacting with a superconducting microwave cavity, we explore this phenomenon in an unprecedented range of interaction times and photon numbers. We demonstrate the efficient production of cat states, which are the quantum superposition of coherent components with nearly opposite phases and sizes in the range of few tens of photons. We measure cuts of their Wigner functions revealing their quantum coherence and observe their fast decoherence. This experiment opens promising perspectives for the rapid generation and manipulation of nonclassical states in cavity and circuit quantum electrodynamics.