报告时间：11月13日 周二 下午3:00
报告人：Armando Rastelli教授 （奥地利Johannes Kepler University Linz）
报告题目： Semiconductor quantum dots for quantum photonics applications
Semiconductor quantum dots (QDs) obtained by epitaxial growth are regarded as one of the most promising solid-state sources of triggered single and entangled photons for applications in emerging quantum communication and photonic quantum-information-processing.
In this talk, I will introduce the “features and bugs” of QDs in view of their potential applications, followed by a presentation of some of our recent results. In particular, I will focus on GaAs QDs in Al-GaAs matrix [1,2], which show a unique combination of appealing features: fast radiative rates of ~5 GHz, capability of generating near perfectly entangled photon pairs  with excellent indistinguisha-bility and ultralow multiphoton emission probability , as well as wavelength matched to the high-sensitivity range of silicon-based single-photon detectors. I will also show that some of the QD “bugs” can be fixed by integrating them onto piezoelectric actuators [5-8]. Strain provided by such actuators is a powerful tool to bring the emission energy of separate dots into resonance , restore broken symmetries , and also change the polarization properties of the emitted photons [2,8]. I will con-clude by discussing the open challenges.
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