Low-noise quantum frequency down-conversion of indistinguishable photons.
We present experimental results on quantum frequency down-conversion of indistinguishable single photons emitted by an InAs/GaAs quantum dot at 904 nm to the telecom C-band at 1557 nm. Hong-Ou-Mandel (HOM) interference measurements are shown prior to and after the down-conversion step. We perform Monte-Carlo simulations of the HOM experiments taking into account the time delays of the different interferometers used and the signal-to-background ratio and further estimate the impact of spectral diffusion on the degree of indistinguishability. By that we conclude that the down-conversion step does not introduce any loss of HOM interference visibility. A noise-free conversion-process along with a high conversion-efficiency (> 30 %) emphasize that our scheme is a promising candidate for an efficient source of indistinguishable single photons at telecom wavelengths.
Benjamin
B
Kambs
Jan
J
Kettler
Matthias
M
Bock
Jonas Nils
JN
Becker
Carsten
C
Arend
Andreas
A
Lenhard
Simone Luca
SL
Portalupi
Michael
M
Jetter
Peter
P
Michler
Christoph
C
Becher