On-chip beamsplitter operation on single photons from quasi-resonantly excited quantum dots embedded in GaAs rib waveguides
On-chip beamsplitter operation on single photons from quasi-resonantly excited quantum dots embedded in GaAs rib waveguides
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DOI：
10.1063/1.4926729
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发表时间：
2015-07
影响因子：
4
通讯作者：
Ulrich Rengstl;Mario Schwartz;T. Herzog;F. Hargart;M. Paul;S. Portalupi;M. Jetter;P. Michler
中科院分区：
文献类型：
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作者：
Ulrich Rengstl;Mario Schwartz;T. Herzog;F. Hargart;M. Paul;S. Portalupi;M. Jetter;P. Michler
我们提出了一种利用准共振驱动的InGaAs/GaAs量子点工作在单光子水平上的片上分束器。单个光子由脊形波导引导，并由衰减场耦合器分成两个臂。虽然波导本身支持TE和TM基模，但测量的偏振度(∼90%)揭示了TE模的主要激发和传播。我们通过对分束器的两个输出臂进行互相关测量，观察到准共振激发量子点的保留单光子性质。此外，还研究了同一量子点在共振激发下的情况，观察到了相同的分裂比。用单输出臂上的片外分束器进行的自相关测量揭示了片上分束器内部的消逝耦合后的单光子性质。嵌入量子点的脊形波导型分束器具有较强的稳健性、可调的分束比和易于实现等优点，为量子电路的全集成提供了良好的基础。
We present an on-chip beamsplitter operating on a single-photon level by means of a quasi-resonantly driven InGaAs/GaAs quantum dot. The single photons are guided by rib waveguides and split into two arms by an evanescent field coupler. Although the waveguides themselves support the fundamental TE and TM modes, the measured degree of polarization (∼90%) reveals the main excitation and propagation of the TE mode. We observe the preserved single-photon nature of a quasi-resonantly excited quantum dot by performing a cross-correlation measurement on the two output arms of the beamsplitter. Additionally, the same quantum dot is investigated under resonant excitation, where the same splitting ratio is observed. An autocorrelation measurement with an off-chip beamsplitter on a single output arm reveal the single-photon nature after evanescent coupling inside the on-chip splitter. Due to their robustness, adjustable splitting ratio, and their easy implementation, rib waveguide beamsplitters with embedded quantum dots provide a promising step towards fully integrated quantum circuits.