40.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.9k papers
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18 papers · 2 filters
On the Role of Density Matrices in Bohmian Mechanics
Detlef Duerr, Sheldon Goldstein, Roderich Tumulka +1
It is well known that density matrices can be used in quantum mechanics to represent the information available to an observer about either a system with a random wave function (``s…
Coherence in Microchip Traps
Philipp Treutlein, Peter Hommelhoff, Tilo Steinmetz +2
We report the coherent manipulation of internal states of neutral atoms in a magnetic microchip trap. Coherence lifetimes exceeding 1 s are observed with atoms at distances of $5-1…
Witnessing multipartite entanglement
Mohamed Bourennane, Manfred Eibl, Christian Kurtsiefer +7
We present the experimental detection of genuine multipartite entanglement using entanglement witness operators. To this aim we introduce a canonical way of constructing and decomp…
Decoherence-Free Quantum Information Processing with Four-Photon Entangled States
Mohamed Bourennane, Manfred Eibl, Sascha Gaertner +3
Decoherence-free states protect quantum information from collective noise, the predominant cause of decoherence in current implementations of quantum communication and computation.…
Controlled Collisions for Multiparticle Entanglement of Optically Trapped Atoms
Olaf Mandel, Markus Greiner, Artur Widera +3
Entanglement lies at the heart of quantum mechanics and in recent years has been identified as an essential resource for quantum information processing and computation. Creating hi…
Quantum Equilibrium and the Role of Operators as Observables in Quantum Theory
Detlef Dürr, Sheldon Goldstein, Nino Zangh\`ı
Bohmian mechnaics is the most naively obvious embedding imaginable of Schrödingers's equation into a completely coherent physical theory. It describes a world in which particles mo…
Quantum dot single photon sources: Prospects for applications in linear optics quantum information processing
A. Kiraz, M. Atature, A. Imamoglu
An optical source that produces single photon pulses on demand has potential applications in linear optics quantum computation, provided that stringent requirements on indistinguis…
Stability of macroscopic entanglement under decoherence
W. Dür, H. -J. Briegel
We investigate the lifetime of macroscopic entanglement under the influence of decoherence. For GHZ-type superposition states we find that the lifetime decreases with the size of t…
Multi-party entanglement in graph states
M. Hein, J. Eisert, H. J. Briegel
Graph states are multi-particle entangled states that correspond to mathematical graphs, where the vertices of the graph take the role of quantum spin systems and edges represent I…
Decoherence without dissipation?
Dominique Gobert, Jan von Delft, Vinay Ambegaokar
In a recent article, Ford, Lewis and O'Connell (PRA 64, 032101 (2001)) discuss a thought experiment in which a Brownian particle is subjected to a double-slit measurement. Analyzin…
Local invariants for multi-partite entangled states allowing for a simple entanglement criterion
Hans Aschauer, John Calsamiglia, Marc Hein +1
We present local invariants of multi-partite pure or mixed states, which can be easily calculated and have a straight-forward physical meaning. As an application, we derive a new e…
Bohmian Mechanics and Quantum Field Theory
Detlef Duerr, Sheldon Goldstein, Roderich Tumulka +1
We discuss a recently proposed extension of Bohmian mechanics to quantum field theory. For more or less any regularized quantum field theory there is a corresponding theory of part…
Multiparticle entanglement purification for graph states
W. Dür, H. Aschauer, H. -J. Briegel
We introduce a class of multiparticle entanglement purification protocols that allow us to distill a large class of entangled states. These include cluster states, GHZ states and v…
Quantum Hamiltonians and Stochastic Jumps
Detlef Duerr, Sheldon Goldstein, Roderich Tumulka +1
With many Hamiltonians one can naturally associate a |Psi|^2-distributed Markov process. For nonrelativistic quantum mechanics, this process is in fact deterministic, and is known…
Experimental observation of four-photon entanglement from down-conversion
M. Eibl, S. Gaertner, M. Bourennane +3
We observe polarization-entanglement between four photons produced from a single down-conversion source. The non-classical correlations between the measurement results violate a ge…
Separable states can be used to distribute entanglement
T. S. Cubitt, F. Verstraete, W. Dur +1
We show that no entanglement is necessary to distribute entanglement; that is, two distant particles can be entangled by sending a third particle that is never entangled with the o…
Measurement-based quantum computation with cluster states
R. Raussendorf, D. E. Browne, H. J. Briegel
We give a detailed account of the one-way quantum computer, a scheme of quantum computation that consists entirely of one-qubit measurements on a particular class of entangled stat…
Geometrical phases for the G(4,2) Grassmannian manifold
Regina Karle, Jiannis Pachos
We generalize the usual abelian Berry phase generated for example in a system with two non-degenerate states to the case of a system with two doubly degenerate energy eigenspaces.…