5.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Ludwig-Maximilians-Universität MünchenDE568 papers
- Munich Center for Quantum Science and TechnologyDE404 papers
- Max Planck SocietyDE381 papers
- Centre National de la Recherche ScientifiqueFR143 papers
- Institute of Photonic SciencesES131 papers
- Technical University of MunichDE114 papers
- Universität InnsbruckAT107 papers
- ETH ZurichCH105 papers
- Harvard UniversityUS101 papers
- Austrian Academy of SciencesAT87 papers
- University of ViennaAT83 papers
- Institució Catalana de Recerca i Estudis AvançatsES75 papers
38 papers · 2 filters
Characterization of single photons using two-photon interference
T. Legero, T. Wilk, A. Kuhn +1
Adiabatic passage techniques allow the generation of single photons which are very long compared to the typical detector time resolution. Therefore the detection time of a photon c…
Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields
Christine A. Muschik, Klemens Hammerer, Eugene S. Polzik +1
We present two protocols, one for the storage of light in an atomic ensemble and the subsequent retrieval, and another one for the generation of entanglement between light and atom…
Genuine three-partite entangled states with a local hidden variable model
Geza Toth, Antonio Acin
We present a family of three-qubit quantum states with a basic local hidden variable model. Any von Neumann measurement can be described by a local model for these states. We show…
Relativity and Lorentz Invariance of Entanglement Distillability
L. Lamata, M. A. Martin-Delgado, E. Solano
We study entanglement distillability of bipartite mixed spin states under Wigner rotations induced by Lorentz transformations. We define weak and strong criteria for relativistic i…
Time-resolved and state-selective detection of single freely falling atoms
Torsten Bondo, Markus Hennrich, Thomas Legero +2
We report on the detection of single, slowly moving Rubidium atoms using laser-induced fluorescence. The atoms move at 3 m/s while they are detected with a time resolution of 60 mi…
Momentum diffusion for coupled atom-cavity oscillators
K. Murr, P. Maunz, P. W. H. Pinkse +4
It is shown that the momentum diffusion of free-space laser cooling has a natural correspondence in optical cavities when the internal state of the atom is treated as a harmonic os…
Teleportation and spin squeezing utilizing multimode entanglement of light with atoms
K. Hammerer, E. S. Polzik, J. I. Cirac
We present a protocol for the teleportation of the quantum state of a pulse of light onto the collective spin state of an atomic ensemble. The entangled state of light and atoms em…
Detection of multipartite entanglement in the vicinity of symmetric Dicke states
Geza Toth
We present methods for detecting entanglement around symmetric Dicke states. In particular, we consider N-qubit symmetric Dicke states with N/2 excitations. In the first part of th…
Analysis of a single-atom dipole trap
Markus Weber, Juergen Volz, Karen Saucke +2
We describe a simple experimental technique which allows to store a single Rubidium 87 atom in an optical dipole trap. Due to light-induced two-body collisions during the loading s…
Energy and multipartite entanglement in multidimensional and frustrated spin models
Otfried Gühne, Geza Toth
We investigate the relation between the entanglement properties of a quantum state and its energy for macroscopic spin models. To this aim, we develop a general method to compute e…
Unconditional two-mode squeezing of separated atomic ensembles
A. S. Parkins, E. Solano, J. I. Cirac
We propose schemes for the unconditional preparation of a two-mode squeezed state of effective bosonic modes realized in a pair of atomic ensembles interacting collectively with op…
Two-setting Bell Inequalities for Graph States
Geza Toth, Otfried Guehne, Hans J. Briegel
We present Bell inequalities for graph states with high violation of local realism. In particular, we show that there is a two-setting Bell inequality for every nontrivial graph st…
Effective Spin Quantum Phases in Systems of Trapped Ions
X. -L. Deng, D. Porras, J. I. Cirac
A system of trapped ions under the action of off--resonant standing--waves can be used to simulate a variety of quantum spin models. In this work, we describe theoretically quantum…
Extremality of Gaussian quantum states
Michael M. Wolf, Geza Giedke, J. Ignacio Cirac
We investigate Gaussian quantum states in view of their exceptional role within the space of all continuous variables states. A general method for deriving extremality results is p…
Quantum states on Harmonic lattices
Norbert Schuch, J. Ignacio Cirac, Michael M. Wolf
We investigate bosonic Gaussian quantum states on an infinite cubic lattice in arbitrary spatial dimensions. We derive general properties of such states as ground states of quadrat…
Dynamics of momentum entanglement in lowest-order QED
L. Lamata, J. Leon, E. Solano
We study the dynamics of momentum entanglement generated in the lowest-order QED interaction between two massive spin-1/2 charged particles, which grows in time as the two fermions…
Experimental Analysis of a 4-Qubit Cluster State
Nikolai Kiesel, Christian Schmid, Ulrich Weber +4
Linear optics quantum logic operations enabled the observation of a four-photon cluster state. We prove genuine four-partite entanglement and study its persistency, demonstrating r…
Quantum measurement of a mesoscopic spin ensemble
G. Giedke, J. M. Taylor, D. D'Alessandro +2
We describe a method for precise estimation of the polarization of a mesoscopic spin ensemble by using its coupling to a single two-level system. Our approach requires a minimal nu…
Vacuum-stimulated cooling of single atoms in three dimensions
Stefan Nussmann, Karim Murr, Markus Hijlkema +3
Taming quantum dynamical processes is the key to novel applications of quantum physics, e.g. in quantum information science. The control of light-matter interactions at the single-…
Standard forms of noisy quantum operations via depolarization
W. Dür, M. Hein, J. I. Cirac +1
We consider noisy, non-local unitary operations or interactions, i.e. the corresponding evolutions are described by completely positive maps or master equations of Lindblad form. W…
Linear Optics C-Phase gate made simple
Nikolai Kiesel, Christian Schmid, Ulrich Weber +2
Linear optics quantum logic gates are the best tool to generate multi-photon entanglement. Simplifying a recent approach [Phys. Rev. A 65, 062324; Phys. Rev. A 66, 024308] we were…
Nano Positioning of Single Atoms in a Micro Cavity
Stefan Nussmann, Markus Hijlkema, Bernhard Weber +3
The coupling of individual atoms to a high-finesse optical cavity is precisely controlled and adjusted using a standing-wave dipole-force trap, a challenge for strong atom-cavity c…
Gaussian quantum channels
J. Eisert, M. M. Wolf
This article provides an elementary introduction to Gaussian channels and their capacities. We review results on the classical, quantum, and entanglement assisted capacities and di…
Entanglement of assistance and multipartite state distillation
John A. Smolin, Frank Verstraete, Andreas Winter
We find that the asymptotic entanglement of assistance of a general bipartite mixed state is equal to the smaller of its two local entropies. Our protocol gives rise to the asympto…