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
Ultimate communication capacity of quantum optical channels by solving the Gaussian minimum-entropy conjecture
V. Giovannetti, R. Garcia-Patron, N. J. Cerf +1
Optical channels, such as fibers or free-space links, are ubiquitous in today's telecommunication networks. They rely on the electromagnetic field associated with photons to carry…
A quantum information approach to statistical mechanics
Gemma De las Cuevas
We review some connections between quantum information and statistical mechanics. We focus on three sets of results for classical spin models. First, we show that the partition fun…
Tensor Networks and Quantum Error Correction
Andrew J. Ferris, David Poulin
We establish several relations between quantum error correction (QEC) and tensor network (TN) methods of quantum many-body physics. We exhibit correspondences between well-known fa…
A solution of the Gaussian optimizer conjecture
V. Giovannetti, A. S. Holevo, R. Garcia-Patron
The long-standing conjectures of the optimality of Gaussian inputs for Gaussian channel and Gaussian additivity are solved for a broad class of covariant or contravariant Bosonic G…
Nondestructive Detection of an Optical Photon
Andreas Reiserer, Stephan Ritter, Gerhard Rempe
All optical detectors to date annihilate photons upon detection, thus excluding repeated measurements. Here, we demonstrate a robust photon detection scheme which does not rely on…
Unifying Projected Entangled Pair States contractions
Michael Lubasch, J. Ignacio Cirac, Mari-Carmen Bañuls
The approximate contraction of a Projected Entangled Pair States (PEPS) tensor network is a fundamental ingredient of any PEPS algorithm, required for the optimization of the tenso…
Gaussian local unitary equivalence of -mode Gaussian states and Gaussian transformations by local operations with classical communication
Géza Giedke, Barbara Kraus
We derive necessary and sufficient conditions for arbitrary multi--mode (pure or mixed) Gaussian states to be equivalent under Gaussian local unitary operations. To do so, we intro…
Systematic errors in current quantum state tomography tools
Christian Schwemmer, Lukas Knips, Daniel Richart +4
Common tools for obtaining physical density matrices in experimental quantum state tomography are shown here to cause systematic errors. For example, using maximum likelihood or le…
Fourier transform of fermionic systems and the spectral tensor network
Andrew J. Ferris
Leveraging the decomposability of the fast Fourier transform, I propose a new class of tensor network that is efficiently contractible and able to represent many-body systems with…
Analysis of circuit imperfections in BosonSampling
Anthony Leverrier, Raúl García-Patrón
BosonSampling is a problem where a quantum computer offers a provable speedup over classical computers. Its main feature is that it can be solved with current linear optics technol…
Antiresonance phase shift in strongly coupled cavity QED
C. Sames, H. Chibani, C. Hamsen +3
We investigate phase shifts in the strong coupling regime of single-atom cavity quantum electrodynamics (QED). On the light transmitted through the system, we observe a phase shift…
Bell violation with entangled photons, free of the coincidence-time loophole
Jan-Åke Larsson, Marissa Giustina, Johannes Kofler +3
In a local realist world view, physical properties are defined prior to and independent of measurement, and no physical influence can propagate faster than the speed of light. Prop…
Tapered fiber coupling of single photons emitted by a deterministically positioned single nitrogen vacancy center
Lars Liebermeister, Fabian Petersen, Asmus v. Münchow +11
A diamond nano-crystal hosting a single nitrogen vacancy (NV) center is optically selected with a confocal scanning microscope and positioned deterministically onto the subwaveleng…
Optimized state independent entanglement detection based on geometrical threshold criterion
Wieslaw Laskowski, Christian Schwemmer, Daniel Richart +3
Experimental procedures are presented for the rapid detection of entanglement of unknown arbitrary quantum states. The methods are based on the entanglement criterion using accessi…
Purifications of multipartite states: limitations and constructive methods
Gemma De las Cuevas, Norbert Schuch, David Pérez-García +1
We analyze the description of quantum many-body mixed states using matrix product states and operators. We consider two such descriptions: (i) as a matrix product density operator…
On 'Bell violation using entangled photons without the fair-sampling assumption'
Johannes Kofler, Sven Ramelow, Marissa Giustina +1
A recent experiment presented, for photons, the first violation of a Bell inequality closing the fair-sampling loophole, i.e., without having to assume that the sample of measured…
Single-Photon Switch based on Rydberg Blockade
Simon Baur, Daniel Tiarks, Gerhard Rempe +1
All-optical switching is a technique in which a gate light pulse changes the transmission of a target light pulse without the detour via electronic signal processing. We take this…
Emitters of -photon bundles
C. Sánchez Muñoz, E. del Valle, A. González Tudela +6
We propose a scheme based on the coherent excitation of a two-level system in a cavity to generate an ultrabright CW and focused source of quantum light that comes in groups (bundl…
Certifiability criterion for large-scale quantum systems
Florian Fröwis, Maarten van den Nest, Wolfgang Dür
Can one certify the preparation of a coherent, many-body quantum state by measurements with bounded accuracy in the presence of noise and decoherence? Here, we introduce a criterio…
Optomechanics assisted with a qubit: From dissipative state preparation to many-body physics
Anika C. Pflanzer, Oriol Romero-Isart, J. Ignacio Cirac
We propose and analyze nonlinear optomechanical protocols that can be implemented by adding a single atom to an optomechanical cavity. In particular, we show how to engineer the en…
Structure, dynamics and bifurcations of discrete solitons in trapped ion crystals
H. Landa, J. Brox, M. Mielenz +2
We study discrete solitons (kinks) accessible in state-of-the-art trapped ion experiments, considering zigzag crystals and quasi-3D configurations, both theoretically and experimen…
Ground States of Fermionic lattice Hamiltonians with Permutation Symmetry
Christina V. Kraus, Maciej Lewenstein, J. Ignacio Cirac
We study the ground states of lattice Hamiltonians that are invariant under permutations, in the limit where the number of lattice sites, N -> \infty. For spin systems, these are p…
Ising models and topological codes: classical algorithms and quantum simulation
M. Van den Nest, W. Dür
We present an algorithm to approximate partition functions of 3-body classical Ising models on two-dimensional lattices of arbitrary genus, in the real-temperature regime. Even tho…
Scaling laws of the cavity enhancement for nitrogen-vacancy centers in diamond
Hanno Kaupp, Christian Deutsch, Huan-Cheng Chang +3
We employ a fiber-based optical microcavity with high finesse to study the enhancement of phonon sideband fluorescence of nitrogen-vacancy centers in nanodiamonds. Harnessing the f…