130 citations · 1.2k across the 52 of their papers we have counts for
15 papers · 1 filter
Two-photon excitation with finite pulses unlocks pure dephasing-induced degradation of entangled photons emitted by quantum dots
Tim Seidelmann, Thomas K. Bracht, Barbara Ursula Lehner +7
Semiconductor quantum dots have emerged as an especially promising platform for the generation of polarization-entangled photon pairs. However, it was demonstrated recently that th…
Phonon-induced transition between entangled and nonentangled photon emission in constantly driven quantum-dot--cavity systems
Tim Seidelmann, Michael Cosacchi, Moritz Cygorek +3
Entangled photon pairs are essential for many applications in quantum technologies. Recent theoretical studies demonstrated that different types of entangled Bell states can be cre…
Schrödinger cats in quantum-dot--cavity systems
M. Cosacchi, T. Seidelmann, J. Wiercinski +4
A Schrödinger-cat state is a coherent superposition of macroscopically distinguishable quantum states, in quantum optics usually realized as superposition of coherent states. Proto…
On-demand generation of higher-order Fock states in quantum-dot--cavity systems
M. Cosacchi, J. Wiercinski, T. Seidelmann +4
The on-demand preparation of higher-order Fock states is of fundamental importance in quantum information sciences. We propose and compare different protocols to generate higher-or…
Trion induced photoluminescence of a doped MoS2 monolayer
Yaroslav V. Zhumagulov, Alexei Vagov, Paulo E. Faria Junior +2
We demonstrate that the temperature and doping dependencies of the photoluminescence (PL) spectra of a doped MoS2 monolayer have several peculiar characteristics defined by trion r…
Transiently changing shape of the photon number distribution in a quantum-dot--cavity system driven by chirped laser pulses
M. Cosacchi, T. Seidelmann, F. Ungar +3
We have simulated the time evolution of the photon number distribution in a semiconductor quantum dot-microcavity system driven by chirped laser pulses and compare with unchirped r…
Nonadiabatic time-dependent density-functional theory at the cost of adiabatic local density approximation
Dmitry R. Gulevich, Yaroslav V. Zhumagulov, Alexei V. Vagov +1
We propose a computationally efficient approach to the nonadiabatic time-dependent density functional theory (TDDFT) which is based on a representation of the frequency-dependent e…
Emission-frequency separated high quality single-photon sources enabled by phonons
Michael Cosacchi, Florian Ungar, Moritz Cygorek +2
We demonstrate theoretically that the single-photon purity of photons emitted from a quantum dot exciton prepared by phonon-assisted off-resonant excitation can be significantly hi…
Phonon-induced enhancement of photon entanglement in quantum dot-cavity systems
Tim Seidelmann, Florian Ungar, Andreas M. Barth +4
We report on simulations of the degree of polarization entanglement of photon pairs simultaneously emitted from a quantum dot-cavity system that demand revisiting the role of phono…
From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity
Tim Seidelmann, Florian Ungar, Moritz Cygorek +4
We investigate the degree of entanglement quantified by the concurrence of photon pairs that are simultaneously emitted in the biexciton-exciton cascade from a quantum dot in a cav…
Path-integral approach for nonequilibrium multi-time correlation functions of open quantum systems coupled to Markovian and non-Markovian environments
Michael Cosacchi, Moritz Cygorek, Florian Ungar +3
Using a real-time path integral approach we develop an algorithm to calculate multi-time correlation functions of open few-level quantum systems that is applicable to highly nonequ…
Comparison of different concurrences characterizing photon-pairs generated in the biexciton cascade in quantum dots coupled to microcavities
Moritz Cygorek, Florian Ungar, Tim Seidelmann +4
We compare three different notions of concurrence to measure the polarization entanglement of two-photon states generated by the biexciton cascade in a quantum dot embedded in a mi…
Nonlinear cavity feeding and unconventional photon statistics in solid-state cavity QED revealed by many-level real-time path-integral calculations
Moritz Cygorek, Andreas M. Barth, Florian Ungar +2
The generation of photons in a microcavity coupled to a laser-driven quantum dot interacting with longitudinal acoustic (LA) phonons is studied in the regime of simultaneously stro…
Fast and selective phonon-assisted state preparation of a quantum dot by adiabatic undressing
A. M. Barth, S. Lüker, A. Vagov +3
We investigate theoretically the temporal behavior of a quantum dot under off-resonant optical excitation targeted at fast acoustic phonon-assisted state preparation. We demonstrat…
Competition between loss channels in quantum-dot cavity systems: unconventional consequences
A. Vagov, M. Glässl, M. D. Croitoru +2
We demonstrate that in quantum-dot cavity systems, the interplay between acoustic phonons and photon losses introduces novel features and characteristic dependencies in the system…