2.4k citations
- Universität InnsbruckAT65 papers
- Austrian Academy of SciencesAT64 papers
- University of ViennaAT17 papers
- Max Planck Institute of Quantum OpticsDE10 papers
- Leibniz University HannoverDE5 papers
- Ludwig-Maximilians-Universität MünchenDE5 papers
- Hungarian Academy of SciencesHU4 papers
- IkerbasqueES4 papers
- Imperial College LondonGB4 papers
- Institute for Solid State Physics and OpticsHU4 papers
- University of LeedsGB4 papers
- University of the Basque CountryES4 papers
10 papers · 1 filter
Graph states as ground states of many-body spin-1/2 Hamiltonians
M. Van den Nest, K. Luttmer, W. Dür +1
We consider the problem whether graph states can be ground states of local interaction Hamiltonians. For Hamiltonians acting on n qubits that involve at most two-body interactions,…
Nonlinear entanglement witnesses, covariance matrices and the geometry of separable states
Otfried Gühne, Norbert Lütkenhaus
Entanglement witnesses provide a standard tool for the analysis of entanglement in experiments. We investigate possible nonlinear entanglement witnesses from several perspectives.…
On the role of memory errors in quantum repeaters
L. Hartmann, B. Kraus, H. -J. Briegel +1
We investigate the influence of memory errors in the quantum repeater scheme for long-range quantum communication. We show that the communication distance is limited in standard op…
Covariance matrices and the separability problem
O. Gühne, P. Hyllus, O. Gittsovich +1
We propose a unifying approach to the separability problem using covariance matrices of locally measurable observables. From a practical point of view, our approach leads to strong…
Quantum Kolmogorov complexity and its applications
C. Mora, H. Briegel, B. Kraus
Kolmogorov complexity is a measure of the information contained in a binary string. We investigate here the notion of quantum Kolmogorov complexity, a measure of the information re…
Measurement-based quantum computation and undecidable logic
M. Van den Nest, H. J. Briegel
We establish a connection between measurement-based quantum computation and the field of mathematical logic. We show that the computational power of an important class of quantum s…