Near-optimal entangled-photon sources in the solid state?
How far are we away from an optimal entangled photon Source? For quantum information applications, SPDC-based entangled photon sources played a crucial role in the past decade. However, these sources have several intrinsic problems, such as the low brightness and the lack of electric injection for practical applications. It is anticipated that semiconductor quantum dots (QDs) could address these problems, if several fundamental challenges can be addressed. Despite the great efforts in the community, an “optimal” entangled photon source has eluded us for a long time. In this talk I will discuss the recent progress on improving the QD based entangled photon sources.
 Y. Huo et al. Nature Physics 10, 46 (2014)
 J. Zhang et al. Nature Communications 6, 10067 (2015)
 Y. Chen et al. Nature Communications 7, 10387 (2016)
 R. Keil et al. Nature Communications 8, 15501 (2017)
 E. Chekhovich et al. Nature Materials 16, 982 (2017)
 J. Zhang et al. Nano Letters 13, 5808 (2013)
 Y. Zhang et al. Nano Letters 16, 5785 (2016)