Double Quantum Dot Floquet Gain Medium
Double Quantum Dot Floquet Gain Medium
复制标题
双量子点Floquet增益中等
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
J. Petta
中科院分区：
文献类型：
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作者：
J. Stehlík;Y. Liu;C. Eichler;T. Hartke;X. Mi;M. Gullans;J. M. Taylor;J. Petta
强驱动有光的二能级量子系统导致了被光子能量隔开的Floquit态的梯形。纳米尺度的量子设备允许在强驱动条件下研究受限电子、声子和光子的相互作用。在这里，我们展示了周期驱动的DQd中的单个电子起到了“Floket增益介质”的作用，其中DQd Floquet准能级中的布居不平衡导致了腔响应中复杂的增益和损耗特征的图案。在没有腔驱动场的情况下，我们进一步测量了由于在Floquet图像中的平衡而产生的大的腔内光子数nc。我们的装置在没有直流电流的情况下工作--直流电流，同一电子被重复驱动到激发态，产生布居反转。这些结果为未来非经典光和驱动量子系统热化的研究铺平了道路。
Strongly driving a two-level quantum system with light leads to a ladder of Floquet states separated by the photon energy. Nanoscale quantum devices allow the interplay of confined electrons, phonons, and photons to be studied under strong driving conditions. Here we show that a single electron in a periodically driven DQD functions as a "Floquet gain medium," where population imbalances in the DQD Floquet quasi-energy levels lead to an intricate pattern of gain and loss features in the cavity response. We further measure a large intra-cavity photon number n_c in the absence of a cavity drive field, due to equilibration in the Floquet picture. Our device operates in the absence of a dc current -- one and the same electron is repeatedly driven to the excited state to generate population inversion. These results pave the way to future studies of non-classical light and thermalization of driven quantum systems.