TY  - JOUR
A1  - Kreinberg, Sören
A1  - Porte, Xavier
A1  - Schicke, David
A1  - Lingnau, Benjamin
A1  - Schneider, Christian
A1  - Höfling, Sven
A1  - Kanter, Ido
A1  - Lüdge, Kathy
A1  - Reitzenstein, Stephan
T1  - Mutual coupling and synchronization of optically coupled quantum-dot micropillar lasers at ultra-low light levels
JF  - Nature Communications
N2  - Synchronization of coupled oscillators at the transition between classical physics and quantum physics has become an emerging research topic at the crossroads of nonlinear dynamics and nanophotonics. We study this unexplored field by using quantum dot microlasers as optical oscillators. Operating in the regime of cavity quantum electrodynamics (cQED) with an intracavity photon number on the order of 10 and output powers in the 100 nW range, these devices have high β-factors associated with enhanced spontaneous emission noise. We identify synchronization of mutually coupled microlasers via frequency locking associated with a sub-gigahertz locking range. A theoretical analysis of the coupling behavior reveals striking differences from optical synchronization in the classical domain with negligible spontaneous emission noise. Beyond that, additional self-feedback leads to zero-lag synchronization of coupled microlasers at ultra-low light levels. Our work has high potential to pave the way for future experiments in the quantum regime of synchronization.
KW  - nanoscale devices
KW  - quantum optics
KW  - semiconductor lasers
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-229811
VL  - 10
ER  - 
TY  - JOUR
A1  - Das, Rathindra Nath
A1  - Sounda, Sobhan Kumar
T1  - Coherence and path indistinguishability for the interference of multiple single-mode fields
JF  - Indian Journal of Physics
N2  - A well-known result for the interference of two single-mode fields is that the degree of coherence and the degree of indistinguishability are the same when we consider the detection of a single photon. In this article, we present the relation between the degree of coherence, path indistinguishability and the fringe visibility considering interference of multiple numbers of single-mode fields while being interested in the detection of a single photon only. We will also mention how Born’s rule of interference for multiple sources is reflected in these results.
KW  - path indistinguishability
KW  - coherence
KW  - quantum optics
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-325146
SN  - 0973-1458
VL  - 97
IS  - 2
ER  - 
TY  - JOUR
A1  - Astakhov, Georgy V.
A1  - Fuchs, F.
A1  - Soltamov, V. A.
A1  - Väth, S.
A1  - Baranov, P. G.
A1  - Mokhov, E. N.
A1  - Dyakonov, V.
T1  - Silicon carbide light-emitting diode as a prospective room temperature source for single photons
JF  - Scientific Reports
N2  - Generation of single photons has been demonstrated in several systems. However, none of them satisfies all the conditions, e.g. room temperature functionality, telecom wavelength operation, high efficiency, as required for practical applications. Here, we report the fabrication of light-emitting diodes (LEDs) based on intrinsic defects in silicon carbide (SiC). To fabricate our devices we used a standard semiconductor manufacturing technology in combination with high-energy electron irradiation. The room temperature electroluminescence (EL) of our LEDs reveals two strong emission bands in the visible and near infrared (NIR) spectral ranges, associated with two different intrinsic defects. As these defects can potentially be generated at a low or even single defect level, our approach can be used to realize electrically driven single photon source for quantum telecommunication and information processing.
KW  - semiconductors
KW  - inorganic LEDs
KW  - quantum optics
KW  - nanophotonics
KW  - plasmonics
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-96308
ER  - 
TY  - JOUR
A1  - Brixner, Tobias
A1  - Koch, Federico
A1  - Kullmann, Martin
A1  - Selig, Ulrike
A1  - Nuernberger, Patrick
A1  - Götz, Daniel C. G.
A1  - Bringmann, Gerhard
T1  - Coherent two-dimensional electronic spectroscopy in the Soret band of a chiral porphyrin dimer
JF  - New Journal of Physics
N2  - Using coherent two-dimensional (2D) electronic spectroscopy in fully noncollinear geometry, we observe the excitonic coupling of β,β'-linked bis[tetraphenylporphyrinato-zinc(II)] on an ultrafast timescale in the excited state. The results for two states in the Soret band originating from an excitonic splitting are explained by population transfer with approximately 100 fs from the energetically higher to the lower excitonic state. This interpretation is consistent with exemplary calculations of 2D spectra for a model four-level system with coupling.
KW  - optics
KW  - quantum optics
KW  - laser
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-96139
ER  -