PT Journal AU Zwiller, Vc8r Blom, H Jonsson, P Panev, N Jeppesen, S Tsegaye, T Goobar, E Pistol, M Samuelson, L Björk, G TI Single quantum dots emit single photons at a time: Antibunching experiments SO Applied Physics Letters JI Appl. Phys. Lett. PY 2001 BP 2476 VL 78 IS 17 DI 10.1063/1.1366367 DE antibunching; quantum dot ER