Zobrazeno 1 - 10
of 274
pro vyhledávání: '"Scheel, Stefan"'
Autor:
Dutta, Biplab, Carvalho, Joao Carlos de Aquino, Garcia-Arellano, Guadalupe, Pedri, Paolo, Laliotis, Athanasios, Boldt, Chris, Kaushal, Jivesh, Scheel, Stefan
In the extreme near-field, when the spatial extension of the atomic wavefunction is no longer negligible compared to the atom-surface distance, the dipole approximation is no longer sufficient to describe Casimir-Polder interactions. Here we calculat
Externí odkaz:
http://arxiv.org/abs/2404.13354
Autor:
Neef, Vera, Pinske, Julien, Wolterink, Tom A. W., Becker, Karo, Heinrich, Matthias, Scheel, Stefan, Szameit, Alexander
One of the most promising nascent technologies, quantum computation faces a major challenge: The need for stable computational building blocks. We present the quantum-optical realization of non-adiabatic holonomies that can be used as single-qubit qu
Externí odkaz:
http://arxiv.org/abs/2401.04014
Autor:
Belov, Pavel A., Morawetz, Florian, Krüger, Sjard Ole, Scheuler, Niklas, Rommel, Patric, Main, Jörg, Giessen, Harald, Scheel, Stefan
Publikováno v:
Phys. Rev. B 109, 235404 (2024)
Due to quantum confinement, excitons in finite-sized crystals behave rather differently than in bulk materials. We investigate the dependence of energies of Rydberg excitons on the strengths of parabolic as well as rectangular confinement potentials
Externí odkaz:
http://arxiv.org/abs/2310.19746
Multiphoton correlations in linear photonic quantum networks are governed by matrix permanents. Yet, surprisingly few systematic properties of these crucial algebraic objects are known, while their calculation is a computationally hard task. As such,
Externí odkaz:
http://arxiv.org/abs/2302.11884
Publikováno v:
Phys. Rev. A 107, 062217 (2023)
When a quantum state traverses a path, while being under the influence of a gauge potential, it acquires a geometric phase that is often more than just a scalar quantity. The variety of unitary transformations that can be realised by this form of par
Externí odkaz:
http://arxiv.org/abs/2301.11999
Autor:
Pinske, Julien, Scheel, Stefan
We construct a unified operator framework for quantum holonomies generated from bosonic systems. For a system whose Hamiltonian is bilinear in the creation and annihilation operators, we find a holonomy group determined only by a set of selected orth
Externí odkaz:
http://arxiv.org/abs/2204.03539
Publikováno v:
Phys. Rev. B 104, 085204 (2021)
We study dipole interseries transitions between the yellow and green exciton series in cuprous oxide including the complex valence band structure. To this end, we extend previous studies of the spectrum of complex green exciton resonances [Phys. Rev.
Externí odkaz:
http://arxiv.org/abs/2108.10441
Autor:
Pinske, Julien, Scheel, Stefan
The generation of non-Abelian geometric phases from a system of evanescently coupled waveguides is extended towards the framework of nonorthogonal coupled-mode theory. Here, we study an experimentally feasible tripod arrangement of waveguides that co
Externí odkaz:
http://arxiv.org/abs/2105.04859
Autor:
Stielow, Thomas, Scheel, Stefan
Publikováno v:
Phys. Rev. E 103, 053312 (2021)
Single-shot wide-angle diffraction imaging is a widely used method to investigate the structure of non-crystallizing objects such as nanoclusters, large proteins or even viruses. Its main advantage is that information about the three-dimensional stru
Externí odkaz:
http://arxiv.org/abs/2101.09136
Publikováno v:
Phys. Rev. A 103, 063709 (2021)
Based on a Liouville-space formulation of open systems, we present a solution to the quantum master equation of two coupled optical waveguides with varying loss. The periodic modulation of the Markovian loss of one of them yields a passive $\mathcal{
Externí odkaz:
http://arxiv.org/abs/2012.11991