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
34 papers · 2 filters
Entanglement Percolation in Quantum Networks
Antonio Acin, J. Ignacio Cirac, Maciej Lewenstein
Quantum networks are composed of nodes which can send and receive quantum states by exchanging photons. Their goal is to facilitate quantum communication between any nodes, somethi…
Sequential Generation of Matrix-Product States in Cavity QED
C. Schoen, K. Hammerer, M. M. Wolf +2
We study the sequential generation of entangled photonic and atomic multi-qubit states in the realm of cavity QED. We extend the work of C. Schoen et al. [Phys. Rev. Lett. 95, 1105…
Delocalized Entanglement of Atoms in optical Lattices
K. G. H. Vollbrecht, J. I. Cirac
We show how to detect and quantify entanglement of atoms in optical lattices in terms of correlations functions of the momentum distribution. These distributions can be measured di…
A measurement-based measure of the size of macroscopic quantum superpositions
Jan Ivar Korsbakken, K. Birgitta Whaley, Jonathan DuBois +1
Recent experiments claiming formation of quantum superposition states in near macroscopic sys- tems raise the question of how the sizes of general quantum superposition states in a…
Quantum processing photonic states in optical lattices
Christine A. Muschik, Ines de Vega, Diego Porras +1
The mapping of photonic states to collective excitations of atomic ensembles is a powerful tool which finds a useful application in the realization of quantum memories and quantum…
The computational complexity of PEPS
Norbert Schuch, Michael M. Wolf, Frank Verstraete +1
We determine the computational power of preparing Projected Entangled Pair States (PEPS), as well as the complexity of classically simulating them, and generally the complexity of…
Polarization-controlled single photons
T. Wilk, S. C. Webster, H. P. Specht +2
Vacuum-stimulated Raman transitions are driven between two magnetic substates of a rubidium-87 atom strongly coupled to an optical cavity. A magnetic field lifts the degeneracy of…
Experimental demonstration of four-party quantum secret sharing
S. Gaertner, C. Kurtsiefer, M. Bourennane +1
Secret sharing is a multiparty cryptographic task in which some secret information is splitted into several pieces which are distributed among the participants such that only an au…
Effective Quantum Dynamics of Interacting Systems with Inhomogeneous Coupling
C. E. Lopez, H. Christ, J. C. Retamal +1
We study the quantum dynamics of a single mode/particle interacting inhomogeneously with a large number of particles and introduce an effective approach to find the accessible Hilb…
Photoionization Broadening of the 1S-2S Transition in a Beam of Atomic Hydrogen
N. Kolachevsky, M. Haas, U. D. Jentschura +7
We consider the excitation dynamics of the two-photon \sts transition in a beam of atomic hydrogen by 243 nm laser radiation. Specifically, we study the impact of ionization dampin…
Efficient algorithm for multi-qudit twirling for ensemble quantum computation
Geza Toth, Juan Jose Garcia-Ripoll
We present an efficient algorithm for twirling a multi-qudit quantum state. The algorithm can be used for approximating the twirling operation in an ensemble of physical systems in…
Remote preparation of an atomic quantum memory
Wenjamin Rosenfeld, Stefan Berner, Juergen Volz +2
Storage and distribution of quantum information are key elements of quantum information processing and quantum communication. Here, using atom-photon entanglement as the main physi…
How much entanglement can be generated between two atoms by detecting photons?
L. Lamata, J. J. Garcia-Ripoll, J. I. Cirac
It is possible to achieve an arbitrary amount of entanglement between two atoms using only spontaneously emitted photons, linear optics, single photon sources and projective measur…
High fidelity teleportation between light and atoms
K. Hammerer, E. S. Polzik, J. I. Cirac
We show how high fidelity quantum teleportation of light to atoms can be achieved in the same setup as was used in the recent experiment [J. Sherson et.al., quant-ph/0605095, accep…
Free-Space distribution of entanglement and single photons over 144 km
R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach +15
Quantum Entanglement is the essence of quantum physics and inspires fundamental questions about the principles of nature. Moreover it is also the basis for emerging technologies of…
Quantum Capacities of Channels with small Environment
Michael M. Wolf, David Perez-Garcia
We investigate the quantum capacity of noisy quantum channels which can be represented by coupling a system to an effectively small environment. A capacity formula is derived for a…
Sequential Quantum Cloning
Y. Delgado, L. Lamata, J. Leon +2
Not all unitary operations upon a set of qubits can be implemented by sequential interactions between each qubit and an ancillary system. We analyze the specific case of sequential…
Quantum simulations under translational symmetry
Christina V. Kraus, Michael M. Wolf, J. Ignacio Cirac
We investigate the power of quantum systems for the simulation of Hamiltonian time evolutions on a cubic lattice under the constraint of translational invariance. Given a set of tr…
Experimental Observation of Four-Photon Entangled Dicke State with High Fidelity
Nikolai Kiesel, Christian Schmid, Geza Toth +2
We present the experimental observation of the symmetric four-photon entangled Dicke state with two excitations . A simple experimental set-up allowed quantum state…
Quantum Capacities of Bosonic Channels
Michael M. Wolf, David Perez-Garcia, Geza Giedke
We investigate the capacity of bosonic quantum channels for the transmission of quantum information. Achievable rates are determined from measurable moments of the channel by showi…
Quantum Information Processing in Optical Lattices and Magnetic Microtraps
Philipp Treutlein, Tilo Steinmetz, Yves Colombe +9
We review our experiments on quantum information processing with neutral atoms in optical lattices and magnetic microtraps. Atoms in an optical lattice in the Mott insulator regime…
Electromagnetically induced coherent backscattering
Yuri V. Rostovtsev, Zoe-Elizabeth Sariyanni, Marlan O. Scully
We demonstrate a strong coherent backward wave oscillation using forward propagating fields only. This is achieved by applying laser fields to an ultra-dispersive medium with prope…
Microwave potentials and optimal control for robust quantum gates on an atom chip
Philipp Treutlein, Theodor W. Hänsch, Jakob Reichel +3
We propose a two-qubit collisional phase gate that can be implemented with available atom chip technology, and present a detailed theoretical analysis of its performance. The gate…
Noise-Free Measurement of Harmonic Oscillators with Instantaneous Interactions
M. Franca Santos, G. Giedke, E. Solano
We present a method of measuring the quantum state of a harmonic oscillator through instantaneous probe-system selective interactions of the Jaynes-Cummings type. We prove that thi…