2017/04/06 by Y.-Y. Liu, Y. -Y. Liu, J. Stehlik +11 · 4 citations
Computer Science · Physics and Astronomy · #Atom (system on chip) #Atomic physics #Condensed matter physics #Maser #Microwave #Optics #Physics #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Quantum tunnelling #Semiconductor #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevlett.119.097702
published as Phys. Rev. Lett. 119, 097702 (2017)
arxiv created 2017/04/06 · openalex publication_date 2017/08/31 · arxiv updated 2017/09/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We demonstrate a single atom maser consisting of a semiconductor double quantum dot (DQD) that is embedded in a high-quality-factor microwave cavity. A finite bias drives the DQD out of equilibrium, resulting in sequential single electron tunneling and masing. We develop a dynamic tuning protocol that allows us to controllably increase the time-averaged repumping rate of the DQD at a fixed level detuning, and quantitatively study the transition through the masing threshold. We further examine the crossover from incoherent to coherent emission by measuring the photon statistics across the masing transition. The observed threshold behavior is in agreement with an existing single atom maser theory when small corrections from lead emission are taken into account.