EPJ Web of Conferences, Vol 243, p 04002 (2020) The European physical journal / Web of Conferences 243, 04002 (2020). doi:10.1051/epjconf/202024304002 9th EPS-QEOD Europhoton Conference, virtual (Prague), Czech Republic, 30 Aug 2020-4 Sep 2020, Prague, Czech Republic, 2020-08-30-2020-09-04