2018 workshop on
Quantum Information Science: Are we at the crossroads?
Michigan State University, East Lansing, Michigan,
September 30 - October 3, 2018.
Single Quantum Emitters for
Encrypted Satellite Communication:
Which Defects in WSe2 Can Do It?
Shuyue Xue, Andrii Kyrylchuk, Dan Liu, and
Department of Physics and Astronomy,
Michigan State University, USA
Monolayers of transition metal dichalcogenides (TMDs) including
MoS2 and WSe2 have received wide scientific
attention as 2D semiconductors with a direct fundamental gap and
potential application in optoelectronics. Recent identification of
single-photon emission from excitons pinned by defects in
WSe2  can be seen as a milestone in photonic
quantum-information technology enabling encrypted satellite
communication and quantum teleportation . The defects
associated with intense narrow spectral lines in the emission
spectrum, which enable single-photon emission, have not been
identified yet. Such identification can be accomplished by
combining core-level photoemission spectroscopy with quantitative
calculations of core-level spectra. This approach has been
successfully used to identify the nature and distribution of
defects in samples of exfoliated black phosphorus .
 Yu-Ming He, Genevieve Clark, John R. Schaibley, Yu He,
Ming-Cheng Chen, Yu-Jia Wei, Xing Ding, Qiang Zhang, Wang Yao,
Xiaodong Xu, Chao-Yang Lu, and Jian-Wei Pan,
"Single quantum emitters in monolayer semiconductors",
Nature Nanotechnology 10, 497-502 (2015).
 Ji-Gang Ren et al.,
"Ground-to-satellite quantum teleportation",
Nature 549, 70-73 (2017).
 Teng Yang, Baojuan Dong, Jizhang Wang, Zhidong Zhang, Jie
Guan, Kaci Kuntz, Scott C. Warren, and David Tománek,
"Interpreting core-level spectra of oxidizing phosphorene:
theory and experiment",
Phys. Rev. B 92, 125412 (2015).