86 citations · 302 across the 26 of their papers we have counts for
27 papers
Process tensor simulations of non-Markovian open quantum systems with large uncoupled subspaces
Thomas K. Bracht, Moritz Cygorek
Process tensors in matrix product operator representation (PT-MPOs) are a powerful tool to calculate the temporal evolution and multi-time correlations of open quantum systems. Whi…
Towards Stirling cooler operable single-photon sources based on low-noise GaAs quantum dots
Maximilian Aigner, Jana Schlücking, Eva Schöll +15
For photonic quantum technology applications, sources capable of emitting photons with indistinguishability close to unity are essential. Ideally, these sources should not require…
Factorization rule for multitime correlations in non-Markovian open quantum systems
Thomas K. Bracht, Moritz Cygorek
Experiments performed on quantum systems often measure multitime correlation functions. When quantum systems are weakly coupled to their environment, the time evolution of such cor…
Photon Number Coherence of a Quantum Dot-Cavity System Excited Using the SUPER Scheme
Paul C. A. Hagen, Thomas Bracht, Mathieu Bozzio +4
To fulfill the security requirements of quantum cryptography, photon number coherence (PNC) of single photon sources has recently become an important figure of merit. Quantum dots…
Tunable multi-photon correlations from a coherently driven quantum dot
Thomas K. Bracht, Rachel N. Clark, Petros Androvitsaneas +7
Mixing the fields generated by different light sources has emerged as a powerful approach for engineering non-Gaussian quantum states. Understanding and controlling the resulting p…
Dynamically Dressed States of a Quantum Four-Level System
Carolin Calcagno, Friedrich Sbresny, Thomas K. Bracht +8
In this work, we experimentally and theoretically study the dressed-state emission of the biexciton-exciton cascade in a semiconductor quantum dot under pulsed, resonant, two-photo…
Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots
L. Hanschke, T. K. Bracht, E. Schöll +11
Phonons in solid-state quantum emitters play a crucial role in their performance as photon sources in quantum technology. For resonant driving, phonons dampen the Rabi oscillations…
Robust Single-Photon Generation for Quantum Information Enabled by Stimulated Adiabatic Rapid Passage
Yusuf Karli, René Schwarz, Florian Kappe +11
The generation of single photons using solid-state quantum emitters is pivotal for advancing photonic quantum technologies, particularly in quantum communication. As the field cont…
Few-Photon SUPER: Quantum emitter inversion via two off-resonant photon modes
Quentin W. Richter, Jan M. Kaspari, Thomas K. Bracht +4
With the realization of controlled quantum systems, exploring excitations beyond the resonant case opens new possibilities. We investigate an extended Jaynes-Cummings model where t…
Theory of time-bin entangled photons from quantum emitters
Thomas K. Bracht, Florian Kappe, Moritz Cygorek +6
Entangled photon pairs form the foundation for many applications in the realm of quantum communication. For fiber-optic transfer of entangled photon pairs, time-bin encoding can po…
Keeping the photon in the dark: Enabling full quantum dot control by chirped pulses and magnetic fields
Florian Kappe, René Schwarz, Yusuf Karli +6
Because dark excitons in quantum dots are not directly optically accessible, so far they have not played a significant role in using quantum dots for photon generation. They posses…
SUPER and femtosecond spin-conserving coherent excitation of a tin-vacancy color center in diamond
Cem Güney Torun, Mustafa Gökçe, Thomas K. Bracht +11
The coherent excitation of an optically active spin system is one of the key elements in the engineering of a spin-photon interface. Using the novel SUPER scheme, we coherently con…
Unveiling the interplay of Mollow physics and perturbed free induction decay by nonlinear optical signals of a dynamically driven two-level system
Jan M. Kaspari, Thomas K. Bracht, Katarina Boos +4
Nonlinear optical signals in optically driven quantum systems can reveal coherences and thereby open up the possibility for manipulation of quantum states. While the limiting cases…
Temperature-independent almost perfect photon entanglement from quantum dots via the SUPER scheme
Thomas K. Bracht, Moritz Cygorek, Tim Seidelmann +2
Entangled photon pairs are essential for quantum communication technology. They can be generated on-demand by semiconductor quantum dots, but several mechanisms are known to reduce…
Compact Chirped Fiber Bragg Gratings for Single-Photon Generation from Quantum Dots
Vikas Remesh, Ria G. Krämer, René Schwarz +10
A scalable source of single photons is a key constituent of an efficient quantum photonic architecture. To realize this, it is beneficial to have an ensemble of quantum emitters th…
Controlling the Photon Number Coherence of Solid-state Quantum Light Sources for Quantum Cryptography
Yusuf Karli, Daniel A. Vajner, Florian Kappe +14
Quantum communication networks rely on quantum cryptographic protocols including quantum key distribution (QKD) using single photons. A critical element regarding the security of Q…
Signatures of dynamically dressed states
Katarina Boos, Sang Kyu Kim, Thomas Bracht +10
The interaction of a resonant light field with a quantum two-level system is of key interest both for fundamental quantum optics and quantum technological applications employing re…
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…
Dressed-state analysis of two-color excitation schemes
Thomas K. Bracht, Tim Seidelmann, Yusuf Karli +5
To coherently control a few-level quantum emitter, typically pulses with an energy resonant to the transition energy are applied making use of the Rabi mechanism, while a single of…
A machine learning approach to drawing phase diagrams of topological lasing modes
Stephan Wong, Jan Olthaus, Thomas K. Bracht +2
Identifying phases and analyzing the stability of dynamic states are ubiquitous and important problems which appear in various physical systems. Nonetheless, drawing a phase diagra…
Collective Excitation of Spatio-Spectrally Distinct Quantum Dots Enabled by Chirped Pulses
Florian Kappe, Yusuf Karli, Thomas K. Bracht +7
For a scalable photonic device producing entangled photons, it is desirable to have multiple quantum emitters in an ensemble that can be collectively excited, despite their spectra…
Two-Photon Excitation Sets Limit to Entangled Photon Pair Generation from Quantum Emitters
Tim Seidelmann, Christian Schimpf, Thomas K. Bracht +5
Entangled photon pairs are key to many novel applications in quantum technologies. Semiconductor quantum dots can be used as sources of on-demand, highly entangled photons. The fid…
SUPER Scheme in Action: Experimental Demonstration of Red-detuned Excitation of a Quantum Dot
Yusuf Karli, Florian Kappe, Vikas Remesh +8
The quest for the perfect single-photon source includes finding the optimal protocol for exciting the quantum emitter. Based on a recently proposed, so-called SUPER (swing-up of qu…
Phonon wave packet emission during state preparation of a semiconductor quantum dot using different schemes
Thomas K. Bracht, Tim Seidelmann, Tilmann Kuhn +2
The carrier-phonon interaction in semiconductor quantum dots can greatly affect the optical preparation of the excited state. For resonant excitation used in the Rabi preparation s…