Explanation of photon correlations in the far-off-resonance optical emission from a quantum-dot-cavity system.
In a coupled quantum-dot-nanocavity system, the photoluminescence from an off-resonance cavity mode exhibits strong quantum correlations with the quantum-dot transitions, even though its autocorrelation function is classical. Using new pump-power dependent photon-correlation measurements, we demonstrate that this seemingly contradictory observation that has so far defied an explanation stems from cascaded cavity photon emission in transitions between excited multiexciton states. The mesoscopic nature of quantum-dot confinement ensures the presence of a quasicontinuum of excitonic transitions, part of which overlaps with the cavity resonance.
Winger
Martin
M
Institute of Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
Volz
Thomas
T
Tarel
Guillaume
G
Portolan
Stefano
S
Badolato
Antonio
A
Hennessy
Kevin J
KJ
Hu
Evelyn L
EL
Beveratos
Alexios
A
Finley
Jonathan
J
Savona
Vincenzo
V
Imamoğlu
Ataç
A