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
41 papers · 2 filters
Experimental implementation of a four-player quantum game
Christian Schmid, Adrian P. Flitney, Witlef Wieczorek +3
Game theory is central to the understanding of competitive interactions arising in many fields, from the social and physical sciences to economics. Recently, as the definition of i…
Memory for Light as a Quantum Process
M. Lobino, C. Kupchak, E. Figueroa +1
We report complete characterization of an optical memory based on electromagnetically induced transparency. We recover the superoperator associated with the memory, under two diffe…
Competing many-body interactions in systems of trapped ions
A. Bermudez, D. Porras, M. A. Martin-Delgado
We propose and theoretically analyse an experimental configuration in which lasers induce 3-spin interactions between trapped ions.By properly choosing the intensities and frequenc…
Classical spin systems and the quantum stabilizer formalism: general mappings and applications
R. Hübener, M. Van den Nest, W. Dür +1
We present general mappings between classical spin systems and quantum physics. More precisely, we show how to express partition functions and correlation functions of arbitrary cl…
Photon-Photon Entanglement with a Single Trapped Atom
B. Weber, H. P. Specht, T. Mueller +4
An experiment is performed where a single rubidium atom trapped within a high-finesse optical cavity emits two independently triggered entangled photons. The entanglement is mediat…
Addendum to "Experimental demonstration of a quantum protocol for Byzantine agreement and liar detection" arXiv:0710.0290
Sascha Gaertner, Mohamed Bourennane, Christian Kurtsiefer +2
Gao et al. [Phys. Rev. Lett. 101, 208901 (2008)] have described a possible intercept-resend attack for the quantum protocol for detectable Byzantine agreement in Phys. Rev. Lett. 1…
Quantum simulations based on measurements and feedback control
K. G. H. Vollbrecht, J. I. Cirac
We propose a scheme for performing quantum simulations with atoms in cavities based on a photon detection feedback loop that requires only linear optical elements. Atoms can be sto…
Two-photon gateway in one-atom cavity quantum electrodynamics
A. Kubanek, A. Ourjoumtsev, I. Schuster +4
Single atoms absorb and emit light from a resonant laser beam photon by photon. We show that a single atom strongly coupled to an optical cavity can absorb and emit resonant photon…
Dynamical Coupling between a Bose-Einstein Condensate and a Cavity Optical Lattice
Stephan Ritter, Ferdinand Brennecke, Kristian Baumann +3
A Bose-Einstein condensate is dispersively coupled to a single mode of an ultra-high finesse optical cavity. The system is governed by strong interactions between the atomic motion…
Classical simulation of quantum computation, the Gottesman-Knill theorem, and slightly beyond
M. Van den Nest
We study classical simulation of quantum computation, taking the Gottesman-Knill theorem as a starting point. We show how each Clifford circuit can be reduced to an equivalent, man…
Pairing in fermionic systems: A quantum information perspective
Christina V. Kraus, Michael M. Wolf, J. Ignacio Cirac +1
The notion of "paired" fermions is central to important condensed matter phenomena such as superconductivity and superfluidity. While the concept is widely used and its physical me…
Critical exponents of one-dimensional quantum critical models by means of MERA tensor network
S. Montangero, M. Rizzi, V. Giovannetti +1
An algorithm for optimizing the MERA tensor network in an infinite system is presented. Using this technique we compute the critical exponents of Ising and XXZ model.
Constrained optimization of sequentially generated entangled multiqubit states
Hamed Saberi, Andreas Weichselbaum, Lucas Lamata +3
We demonstrate how the matrix-product state formalism provides a flexible structure to solve the constrained optimization problem associated with the sequential generation of entan…
Quantum teleportation and entanglement swapping with linear optics logic gates
Christian Schmid, Nikolai Kiesel, Ulrich K. Weber +3
We report on the usage of a linear optics phase gate for distinguishing all four Bell states simultaneously in a quantum teleportation and entanglement swapping protocol. This is d…
Long-distance atom-photon entanglement
W. Rosenfeld, F. Hocke, F. Henkel +4
We report the observation of entanglement between a single trapped atom and a single photon at remote locations. The degree of coherence of the entangled atom-photon pair is verifi…
Collective generation of quantum states of light by entangled atoms
D. Porras, J. I. Cirac
We present a theoretical framework to describe the collective emission of light by entangled atomic states. Our theory applies to the low excitation regime, where most of the atoms…
State Transfer in Highly Connected Networks and a Quantum Babinet Principle
D. I. Tsomokos, M. B. Plenio, I. de Vega +1
The transfer of a quantum state between distant nodes in two-dimensional networks, is considered. The fidelity of state transfer is calculated as a function of the number of intera…
Matter--wave emission in optical lattices: Single particle and collective effects
Ines de Vega, Diego Porras, J. Ignacio Cirac
We introduce a simple set--up corresponding to the matter-wave analogue of impurity atoms embedded in an infinite photonic crystal and interacting with the radiation field. Atoms i…
Interfacing with Hamiltonian Dynamics
Alastair Kay
Simple constructions and protocols are demonstrated to allow the implementation of universal quantum computation on an arbitrarily large quantum system by controlling a fixed numbe…
Spin squeezing in a bimodal condensate: spatial dynamics and particle losses
Yun Li, Philipp Treutlein, Jakob Reichel +1
We propose an analytical method to study the entangled spatial and spin dynamics of interacting bimodal Bose-Einstein condensates. We show that at particular times during the evolu…
The Non-Equilibrium Reliability of Quantum Memories
Alastair Kay
The ability to store quantum information without recourse to constant feedback processes would yield a significant advantage for future implementations of quantum information proce…
One-shot entanglement generation over long distances in noisy quantum networks
S. Perseguers, L. Jiang, N. Schuch +4
We consider the problem of creating a long-distance entangled state between two stations of a network, where neighboring nodes are connected by noisy quantum channels. We show that…
Unital Quantum Channels - Convex Structure and Revivals of Birkhoff's Theorem
Christian B. Mendl, Michael M. Wolf
The set of doubly-stochastic quantum channels and its subset of mixtures of unitaries are investigated. We provide a detailed analysis of their structure together with computable c…
Experimental observation of an entire family of four-photon entangled states
Witlef Wieczorek, Christian Schmid, Nikolai Kiesel +3
A single linear optical set-up is used to observe an entire family of four-photon entangled states. This approach breaks with the inflexibility of present linear-optical set-ups us…