



@article {1815,
	title = {Double Quantum Dot Floquet Gain Medium},
	journal = {Physical Review X},
	volume = {6},
	year = {2016},
	month = {2016/11/07},
	pages = {041027},
	abstract = {<p><span style="color: rgb(0, 0, 0); font-family: \&quot;Lucida Grande\&quot;, helvetica, arial, verdana, sans-serif; font-size: 14.4px;">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 \&quot;Floquet gain medium,\&quot; 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.</span></p>},
	doi = {10.1103/PhysRevX.6.041027},
	url = {http://journals.aps.org/prx/abstract/10.1103/PhysRevX.6.041027},
	author = {J. Stehlik and Y.-Y. Liu and C. Eichler and T. R. Hartke and X. Mi and Michael Gullans and J. M. Taylor and J. R. Petta}
}
@article {1499,
	title = {Semiconductor double quantum dot micromaser},
	journal = {Science},
	volume = {347},
	year = {2015},
	month = {2015/01/15},
	pages = {285 - 287},
	abstract = {  The coherent generation of light, from masers to lasers, relies upon the
specific structure of the individual emitters that lead to gain. Devices
operating as lasers in the few-emitter limit provide opportunities for
understanding quantum coherent phenomena, from THz sources to quantum
communication. Here we demonstrate a maser that is driven by single electron
tunneling events. Semiconductor double quantum dots (DQDs) serve as a gain
medium and are placed inside of a high quality factor microwave cavity. We
verify maser action by comparing the statistics of the emitted microwave field
above and below the maser threshold.
},
	doi = {10.1126/science.aaa2501},
	url = {http://arxiv.org/abs/1507.06359v1},
	author = {Y. -Y. Liu and J. Stehlik and C. Eichler and Michael Gullans and J. M. Taylor and J. R. Petta}
}
