TY - JOUR
T1 - Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source
AU - Gerhardt, S
AU - Iles-Smith, J
AU - McCutcheon, D
AU - He, Y
AU - Unsleber, S
AU - Betzold, S
AU - Gregersen, N
AU - Mørk, J
AU - Höfling, Sven
AU - Schneider, C
N1 - We acknowledge support by the State of Bavaria and the German Ministry of Education and Research (BMBF) within the project Q.com. J.I.-S. and J.M. acknowledge support from the Danish Research Council (DFF-4181-00416) and Villum Fonden (NATEC Centre). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 703193.
PY - 2018/5/15
Y1 - 2018/5/15
N2 - We report a joint experimental and theoretical study of the interference properties of a single-photon source based on a In(Ga)As quantum dot embedded in a quasiplanar GaAs microcavity. Using resonant laser excitation with a pulse separation of 2 ns, we find near-perfect interference of the emitted photons, and a corresponding indistinguishability of I=(99.6^+0.4_−1.4)%. For larger pulse separations, quasiresonant excitation conditions, increasing pump power, or with increasing temperature, the interference contrast is progressively and notably reduced. We present a systematic study of the relevant dephasing mechanisms and explain our results in the framework of a microscopic model of our system. For strictly resonant excitation, we show that photon indistinguishability is independent of pump power, but strongly influenced by virtual phonon-assisted processes which are not evident in excitonic Rabi oscillations.
AB - We report a joint experimental and theoretical study of the interference properties of a single-photon source based on a In(Ga)As quantum dot embedded in a quasiplanar GaAs microcavity. Using resonant laser excitation with a pulse separation of 2 ns, we find near-perfect interference of the emitted photons, and a corresponding indistinguishability of I=(99.6^+0.4_−1.4)%. For larger pulse separations, quasiresonant excitation conditions, increasing pump power, or with increasing temperature, the interference contrast is progressively and notably reduced. We present a systematic study of the relevant dephasing mechanisms and explain our results in the framework of a microscopic model of our system. For strictly resonant excitation, we show that photon indistinguishability is independent of pump power, but strongly influenced by virtual phonon-assisted processes which are not evident in excitonic Rabi oscillations.
U2 - 10.1103/PhysRevB.97.195432
DO - 10.1103/PhysRevB.97.195432
M3 - Article
SN - 1098-0121
VL - 97
JO - Physical Review. B, Condensed matter and materials physics
JF - Physical Review. B, Condensed matter and materials physics
IS - 19
M1 - 195432
ER -