@article{40523,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Tailored nanoscale quantum light sources, matching the specific needs of use cases, are crucial building blocks for photonic quantum technologies. Several different approaches to realize solid-state quantum emitters with high performance have been pursued and different concepts for energy tuning have been established. However, the properties of the emitted photons are always defined by the individual quantum emitter and can therefore not be controlled with full flexibility. Here we introduce an all-optical nonlinear method to tailor and control the single photon emission. We demonstrate a laser-controlled down-conversion process from an excited state of a semiconductor quantum three-level system. Based on this concept, we realize energy tuning and polarization control of the single photon emission with a control-laser field. Our results mark an important step towards tailored single photon emission from a photonic quantum system based on quantum optical principles.</jats:p>}},
  author       = {{Jonas, B. and Heinze, Dirk Florian and Schöll, E. and Kallert, P. and Langer, T. and Krehs, S. and Widhalm, A. and Jöns, Klaus and Reuter, Dirk and Schumacher, Stefan and Zrenner, Artur}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  keywords     = {{General Physics and Astronomy, General Biochemistry, Genetics and Molecular Biology, General Chemistry, Multidisciplinary}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Nonlinear down-conversion in a single quantum dot}}},
  doi          = {{10.1038/s41467-022-28993-3}},
  volume       = {{13}},
  year         = {{2022}},
}

@article{40431,
  author       = {{Praschan, Tom and Heinze, Dirk and Breddermann, Dominik and Zrenner, Artur and Walther, Andrea and Schumacher, Stefan}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{4}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Pulse shaping for on-demand emission of single Raman photons from a quantum-dot biexciton}}},
  doi          = {{10.1103/physrevb.105.045302}},
  volume       = {{105}},
  year         = {{2022}},
}

@misc{40428,
  author       = {{Jonas, Björn and Heinze, Dirk Florian and Schöll, Eva and Kallert, Patricia and Langer, Timo and Krehs, Sebastian and Widhalm, Alex and Jöns, Klaus and Reuter, Dirk and Zrenner, Artur}},
  publisher    = {{LibreCat University}},
  title        = {{{Nonlinear down-conversion in a single quantum dot}}},
  doi          = {{10.5281/ZENODO.6024228}},
  year         = {{2022}},
}

@article{27099,
  abstract     = {{In our work, we have engineered low capacitance single quantum dot photodiodes as sensor devices for the optoelectronic sampling of ultrafast electric signals. By the Stark effect, a time-dependent electric signal is converted into a time-dependent shift of the transition energy. This shift is measured accurately by resonant ps laser spectroscopy with photocurrent detection. In our experiments, we sample the laser synchronous output pulse of an ultrafast CMOS circuit with high resolution. With our quantum dot sensor device, we were able to sample transients below 20 ps with a voltage resolution in the mV-range.}},
  author       = {{Widhalm, Alex and Krehs, Sebastian and Siebert, Dustin and Sharma, Nand Lal and Langer, Timo and Jonas, Björn and Reuter, Dirk and Thiede, Andreas and Förstner, Jens and Zrenner, Artur}},
  issn         = {{0003-6951}},
  journal      = {{Applied Physics Letters}},
  keywords     = {{tet_topic_qd}},
  pages        = {{181109}},
  title        = {{{Optoelectronic sampling of ultrafast electric transients with single quantum dots}}},
  doi          = {{10.1063/5.0061358}},
  volume       = {{119}},
  year         = {{2021}},
}

@article{23816,
  abstract     = {{Employing the ultrafast control of electronic states of a semiconductor quantum dot in a cavity, we introduce an approach to achieve on-demand emission of single photons with almost perfect indistinguishability and photon pairs with near ideal entanglement. Our scheme is based on optical excitation off resonant to a cavity mode followed by ultrafast control of the electronic states using the time-dependent quantum-confined Stark effect, which then allows for cavity-resonant emission. Our theoretical analysis considers cavity-loss mechanisms, the Stark effect, and phonon-induced dephasing, allowing realistic predictions for finite temperatures.}},
  author       = {{Bauch, David and Heinze, Dirk Florian and Förstner, Jens and Jöns, Klaus and Schumacher, Stefan}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  keywords     = {{tet_topic_qd}},
  pages        = {{085308}},
  title        = {{{Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots}}},
  doi          = {{10.1103/physrevb.104.085308}},
  volume       = {{104}},
  year         = {{2021}},
}

@article{13351,
  author       = {{Breddermann, Dominik and Praschan, Tom and Heinze, Dirk Florian and Binder, Rolf and Schumacher, Stefan}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{12}},
  title        = {{{Microscopic theory of cavity-enhanced single-photon emission from optical two-photon Raman processes}}},
  doi          = {{10.1103/physrevb.97.125303}},
  volume       = {{97}},
  year         = {{2018}},
}

@article{3435,
  abstract     = {{Semiconductor quantum dots are promising sources for polarization-entangled photons. As an alternative
to the usual cascaded biexciton-exciton emission, direct two-photon emission from the biexciton can be used.
With a high-quality optical resonator tuned to half the biexciton energy, a large proportion of the photons
can be steered into the two-photon emission channel. In this case the degree of polarization entanglement is
inherently insensitive to the exciton fine-structure splitting. In the present work we analyze the biexciton emission
with particular emphasis on the influence of coupling of the quantum-dot cavity system to its environment.
Especially for a high-quality cavity, the coupling to the surrounding semiconductormaterial can open up additional
phonon-assisted decay channels. Our analysis demonstrates that with the cavity tuned to half the biexciton energy,
the potentially detrimental influence of the phonons on the polarization entanglement is strongly suppressed—high
degrees of entanglement can still be achieved. We further discuss spectral properties and statistics of the emitted
twin photons.}},
  author       = {{Heinze, Dirk and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{24}},
  title        = {{{Polarization-entangled twin photons from two-photon quantum-dot emission}}},
  doi          = {{10.1103/PhysRevB.95.245306}},
  year         = {{2017}},
}

@article{13910,
  author       = {{Ma, Xuekai and Driben, Rodislav and Malomed, Boris A. and Meier, Torsten and Schumacher, Stefan}},
  issn         = {{2045-2322}},
  journal      = {{Scientific Reports}},
  title        = {{{Two-dimensional symbiotic solitons and vortices in binary condensates with attractive cross-species interaction}}},
  doi          = {{10.1038/srep34847}},
  volume       = {{6}},
  year         = {{2016}},
}

@article{4185,
  abstract     = {{Semiconductor quantum-dot cavity systems are promising sources for solid-state-based on-demand generation
of single photons for quantum communication. Commonly, the spectral characteristics of the emitted single
photon are fixed by system properties such as electronic transition energies and spectral properties of the cavity.
In the present work we study cavity-enhanced single-photon generation from the quantum-dot biexciton through
a partly stimulated nondegenerate two-photon emission. We show that frequency and linewidth of the single
photon can be fully controlled by the stimulating laser pulse, ultimately allowing for efficient all-optical spectral
shaping of the single photon.}},
  author       = {{Breddermann, D. and Heinze, D. and Binder, R. and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{16}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{All-optical tailoring of single-photon spectra in a quantum-dot microcavity system}}},
  doi          = {{10.1103/physrevb.94.165310}},
  volume       = {{94}},
  year         = {{2016}},
}

@article{4330,
  abstract     = {{Sources of single photons are key elements for applications in quantum information science.
Among the different sources available, semiconductor quantum dots excel with their
integrability in semiconductor on-chip solutions and the potential that photon emission can
be triggered on demand. Usually, the photon is emitted from a single-exciton ground state.
Polarization of the photon and time of emission are either probabilistic or pre-determined by
electronic properties of the system. Here, we study the direct two-photon emission from the
biexciton. The two-photon emission is enabled by a laser pulse driving the system into a
virtual state inside the band gap. From this intermediate state, the single photon of interest
is then spontaneously emitted. We show that emission through this higher-order
transition provides a versatile approach to generate a single photon. Through the driving
laser pulse, polarization state, frequency and emission time of the photon can be controlled
on-the-fly.}},
  author       = {{Heinze, Dirk and Breddermann, Dominik and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  number       = {{1}},
  publisher    = {{Springer Nature}},
  title        = {{{A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission}}},
  doi          = {{10.1038/ncomms9473}},
  volume       = {{6}},
  year         = {{2015}},
}