Polarization entangled photons from quantum dots embedded in nanowires.
In this Letter, we present entanglement generated from a novel structure: a single InAsP quantum dot embedded in an InP nanowire. These structures can grow in a site-controlled way and exhibit high collection efficiency; we detect 0.5 million biexciton counts per second coupled into a single mode fiber with a standard commercial avalanche photo diode. If we correct for the known setup losses and detector efficiency, we get an extraction efficiency of 15(3) %. For the measured polarization entanglement, we observe a fidelity of 0.76(2) to a reference maximally entangled state as well as a concurrence of 0.57(6).
Institut für Experimentalphysik, Universität Innsbruck , Technikerstr. 25, 6020 Innsbruck, Austria.
Tobias
T
Huber
Ana
A
Predojević
Milad
M
Khoshnegar
Dan
D
Dalacu
Philip J
PJ
Poole
Hamed
H
Majedi
Gregor
G
Weihs
Quantum optics; nanowires; polarization entanglement; quantum dots