Zobrazeno 1 - 10
of 425
pro vyhledávání: '"Scheel S"'
Publikováno v:
Physical Review Letters, American Physical Society, 2021
At nanometer separation, the dominant interaction between an atom and a material surface is the fluctuation-induced Casimir-Polder potential. We demonstrate that slow atoms crossing a silicon nitride transmission nanograting are a remarkably sensitiv
Externí odkaz:
http://arxiv.org/abs/2110.11123
Autor:
Heckötter, J., Freitag, M., Fröhlich, D., Aßmann, M., Bayer, M., Grünwald, P., Schöne, F., Semkat, D., Stolz, H., Scheel, S.
Publikováno v:
Phys. Rev. Lett. 121, 097401 (2018)
We use two-color pump-probe spectroscopy to study Rydberg excitons in Cu$_2$O in the presence of free carriers injected by above-band-gap excitation. Already at plasma densities $\rho_\text{eh}$ below one hundredth electron-hole pair per \textmu m$^{
Externí odkaz:
http://arxiv.org/abs/1709.00891
Publikováno v:
Phys. Rev. A 93, 032132 (2016)
Modern applications in quantum computation and quantum communication require the precise characterization of quantum states and quantum channels. In practice, this means that one has to determine the quantum capacity of a physical system in terms of
Externí odkaz:
http://arxiv.org/abs/1601.04817
Publikováno v:
Phys. Rev. Lett. 117, 133003 (2016)
Coherent optical control of individual particles has been demonstrated both for atoms and semiconductor quantum dots. Here we demonstrate the emergence of quantum coherent effects in semiconductor Rydberg excitons in bulk Cu$_2$O. Due to the spectral
Externí odkaz:
http://arxiv.org/abs/1511.07742
Autor:
Jetter, B., Märkle, J., Schneeweiss, P., Gierling, M., Scheel, S., Günther, A., Fortágh, J., Judd, T. E.
Publikováno v:
New J. Phys. 15, 073009 (2013)
We investigate theoretically how cold atoms, including Bose-Einstein condensates, are scattered from, or absorbed by nanotubes with a view to analysing recent experiments. In particular we consider the role of potential strength, quantum reflection,
Externí odkaz:
http://arxiv.org/abs/1205.6161
We investigate the use of integrated, microfabricated photonic-atomic junctions for quantum information processing applications. The coupling between atoms and light is enhanced by using microscopic optics without the need for cavity enhancement. Qub
Externí odkaz:
http://arxiv.org/abs/1105.0870
Autor:
Audenaert, K. M. R., Scheel, S.
Publikováno v:
New J. Phys. 11, 113052 (2009)
We consider the statistical properties of photon detection with imperfect detectors that exhibit dark counts and less than unit efficiency, in the context of tomographic reconstruction. In this context, the detectors are used to implement certain POV
Externí odkaz:
http://arxiv.org/abs/0906.3668
Autor:
Kasch, B., Hattermann, H., Cano, D., Judd, T. E., Scheel, S., Zimmermann, C., Kleiner, R., Kölle, D., Fortágh, J.
We report on the measurement of atomic spin coherence near the surface of a superconducting niobium wire. As compared to normal conducting metal surfaces, the atomic spin coherence is maintained for time periods beyond the Johnson noise limit. The re
Externí odkaz:
http://arxiv.org/abs/0906.1369
Publikováno v:
Physical Review A 79 (5), 052903 (2009)
We study the influence of thermal Casimir-Polder forces on the near-surface trapping of cold polar molecules, with emphasis on LiH and YbF near an Au surface at room temperature. We show that for a molecule initially prepared in its electronic and ro
Externí odkaz:
http://arxiv.org/abs/0812.1914
Autor:
Audenaert, Koenraad M. R., Scheel, S.
Publikováno v:
New J. Phys. 11, 023028 (2009)
We present a novel quantum tomographic reconstruction method based on Bayesian inference via the Kalman filter update equations. The method not only yields the maximum likelihood/optimal Bayesian reconstruction, but also a covariance matrix expressin
Externí odkaz:
http://arxiv.org/abs/0809.3359