Highly-Indistinguishable Single-Photons at 1550 nm from a Two-photon Resonantly Excited Purcell-enhanced Quantum Dot
University of Würzburg（维尔茨堡大学）
Robert Behrends, Martin v. Helversen, Pratim K. Saha, Lucas Rickert, Koray Kaymazlar, Mareike Lach, Nils D. Kewitz, Jochen Kaupp, Yorick Reum, Tobias Huber-Loyo… 展开作者
Robert Behrends, Martin v. Helversen, Pratim K. Saha, Lucas Rickert, Koray Kaymazlar, Mareike Lach, Nils D. Kewitz, Jochen Kaupp, Yorick Reum, Tobias Huber-Loyola, Sven Höfling, Andreas Pfenning, Tobias Heindel
In this work we present a cavity-enhanced InAs/$\mathrm{In_{0.53}Al_{0.23}Ga_{0.24}As}$ quantum dot (QD) single-photon source in the telecom C-band with a record-low biexciton emitter decay time of \SI{67.4(2)}{ps} under resonant two-photon excitation (TPE). We observe strong multiphoton suppression associated with $g^{(2)}_\mathrm{X}(0) = 0.006(1)$ and $g^{(2)}_\mathrm{XX}(0) = 0.007(1)$ for the exciton (X) and biexciton (XX) emission, respectively. Due to a asymmetric Purcell enhancement of the XX-X cascade, the two-photon interference (TPI) visibility of XX photons under $π$-pulse excitation of $V_{\rm{TPI}} = 90(3)\%$ reaches the theoretical limit and clearly exceeds the $\sim60\%$ expected for standard XX-X cascades without photonic engineering. Furthermore, adding a second timed laser pulse coinciding with XX emission energy, we demonstrate stimulated TPE in the telecom C-Band. The result is an improved TPI visibility of the X photons of $V_{\rm{TPI}}=0.69(3)$ compared to TPE with $V_{\rm{TPI}}=0.61(4)$, with both being reduced compared to the theoretical values due to present dephasing effects. The advances presented in this work hold important promises for the implementation of advanced schemes of quantum communication using deterministic quantum light sources.
Deterministic coupling of a quantum emitter to surface plasmon polaritons, Purcell enhanced generation of indistinguishable single photons and quantum information processing
集成光子电路是全光、片上量子信息处理和量子计算机的重要组成部分。纳米等离子体电路中的确定性集成单光子源导致了在衍射极限之外操作的密集封装的可扩展量子逻辑电路。在这里，我们报告的耦合效率的单光子源的等离子体波导，特征传输光谱，传播长度，衰减长度，和等离子体的珀塞尔因子。我们模拟了金属-介质-金属波导中不同宽度介质的透射谱，以找到合适的波长。发现Al $_{2}$ O $_{3}$的最大传输长度为3.98 m，介电宽度为140 nm，耦合效率大于82%.发现等离子体Purcell因子与介电宽度（w）成反比，当w等于1 nm时，其高达31974。我们还计算了光子的量子特性，如不可逆性，发现如果单光子源是确定性耦合的，它可以通过等离子体纳米腔增强。进一步，我们提出了一个可扩展的金属-介质-金属波导基于量子逻辑电路使用的等离子体电路和马赫-曾德尔干涉仪。
Giant Purcell broadening and Lamb shift for DNA-assembled near-infrared quantum emitters
Ecole Polytechnique Fédérale de Lausanne (EPFL)（洛桑联邦理工学院）；University of Fribourg（弗里堡大学）；Materials Physics Center CSIC-UPV/EHU（CSIC-巴斯克国立自治大学材料物理中心）；Donostia International Physics Center (DIPC)（圣塞巴斯蒂安国际物理中心）；Ikerbasque, Basque Foundation for Science（伊克拉巴斯科，巴斯克科学基金会）；University of the Basque Country (UPV/EHU)（巴斯克国立自治大学）
