Quantum Calligraphy (IMAGE) Naval Research Laboratory Caption (a) Illustration showing an AFM tip indenting the TMD/polymer structure to introduce local strain. (b) Patterned single photon emission in WSe2 induced by AFM indentation of the letters 'NRL' and 'AFRL'. (c) AFM indents produce single photon emitter 'ornaments' on a monolayer WSe2 'Christmas tree.' Credit US Naval Research Laboratory Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.