330 citations · 1.1k across the 14 of their papers we have counts for
14 papers
Frequency Feedback for Two-Photon Interference from Separate Quantum Dots
Michael Zopf, Tobias Macha, Robert Keil +7
We employ active feedback to stabilize the frequency of single photons emitted by two separate quantum dots to an atomic standard. The transmission of a single, rubidium-based Fara…
State-dependent fluorescence of neutral atoms in optical potentials
Miguel Martinez-Dorantes, Wolfgang Alt, Jose Gallego +3
Recently we have demonstrated scalable, non-destructive, and high-fidelity detection of the internal state of Rb neutral atoms in optical dipole traps using state-dependent…
Segmentation of nearly isotropic overlapped tracks in photomicrographs using successive erosions as watershed markers
Alexandre Fioravante de Siqueira, Wagner Massayuki Nakasuga, Sandro Guedes +1
The major challenges of automatic track counting are distinguishing tracks and material defects, identifying small tracks and defects of similar size, and detecting overlapping tra…
High Finesse Fiber Fabry-Perot Cavities: Stabilization and Mode Matching Analysis
Jose Gallego, Sutapa Ghosh, Seyed Khalil Alavi +4
Fiber Fabry-Perot cavities, formed by micro-machined mirrors on the end-facets of optical fibers, are used in an increasing number of technical and scientific applications, where t…
Cavity-Modified Collective Rayleigh Scattering of Two Atoms
René Reimann, Wolfgang Alt, Tobias Kampschulte +5
We report on the observation of cooperative radiation of exactly two neutral atoms strongly coupled to the single mode field of an optical cavity, which is close to the lossless-ca…
Carrier-free Raman manipulation of trapped neutral atoms
René Reimann, Wolfgang Alt, Tobias Macha +4
We experimentally realize an enhanced Raman control scheme for neutral atoms that features an intrinsic suppression of the two-photon carrier transition, but retains the sidebands…
Quantum erasure with causally disconnected choice
Xiao-song Ma, Johannes Kofler, Angie Qarry +9
The counterintuitive features of quantum physics challenge many common-sense assumptions. In an interferometric quantum eraser experiment, one can actively choose whether or not to…
Controlling chemical reactions of a single particle
Lothar Ratschbacher, Christoph Zipkes, Carlo Sias +1
The control of chemical reactions is a recurring theme in physics and chemistry. Traditionally, chemical reactions have been investigated by tuning thermodynamic parameters, such a…
Laser spectroscopy and cooling of Yb+ ions on a deep-UV transition
Hendrik M. Meyer, Matthias Steiner, Lothar Ratschbacher +2
We perform laser spectroscopy of Yb+ ions on the 4f14 6s 2S_{1/2} - 4f13 5d 6s 3D[3/2]_{1/2} transition at 297 nm. The frequency measurements for 170Yb+, 172Yb+, 174Yb+, and 176Yb+…
Kinetics of a single trapped ion in an ultracold buffer gas
Christoph Zipkes, Lothar Ratschbacher, Carlo Sias +1
The immersion of a single ion confined by a radiofrequency trap in an ultracold atomic gas extends the concept of buffer gas cooling to a new temperature regime. The steady state e…
Hybrid quantum systems of atoms and ions
Christoph Zipkes, Lothar Ratschbacher, Stefan Palzer +2
In recent years, ultracold atoms have emerged as an exceptionally controllable experimental system to investigate fundamental physics, ranging from quantum information science to s…
Feasibility of 300 km Quantum Key Distribution with Entangled States
Thomas Scheidl, Rupert Ursin, Alessandro Fedrizzi +8
A significant limitation of practical quantum key distribution (QKD) setups is currently their limited operational range. It has recently been emphasized (X. Ma, C.-H. F. Fung, and…
Cold heteronuclear atom-ion collisions
Christoph Zipkes, Stefan Palzer, Lothar Ratschbacher +2
We study cold heteronuclear atom ion collisions by immersing a trapped single ion into an ultracold atomic cloud. Using ultracold atoms as reaction targets, our measurement is sens…
Violation of local realism with freedom of choice
Thomas Scheidl, Rupert Ursin, Johannes Kofler +8
Bell's theorem shows that local realistic theories place strong restrictions on observable correlations between different systems, giving rise to Bell's inequality which can be vio…