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53 papers · 1 filter
Bounds for Non-Locality Distillation Protocols
Manuel Forster
Non-locality can be quantified by the violation of a Bell inequality. Since this violation may be amplified by local operations an alternative measure has been proposed - distillab…
Observation of Resonant Photon Blockade at Microwave Frequencies using Correlation Function Measurements
C. Lang, D. Bozyigit, C. Eichler +8
Creating a train of single photons and monitoring its propagation and interaction is challenging in most physical systems, as photons generally interact very weakly with other syst…
Highly Entangled States With Almost No Secrecy
Matthias Christandl, Norbert Schuch, Andreas Winter
In this paper we illuminate the relation between entanglement and secrecy by providing the first example of a quantum state that is highly entangled, but from which, nevertheless,…
Multi-mode mediated exchange coupling in cavity QED
S. Filipp, M. Göppl, J. M. Fink +4
Microwave cavities with high quality factors enable coherent coupling of distant quantum systems. Virtual photons lead to a transverse exchange interaction between qubits, when the…
A quasipolynomial-time algorithm for the quantum separability problem
Fernando G. S. L. Brandao, Matthias Christandl, Jon Yard
We present a quasipolynomial-time algorithm for solving the weak membership problem for the convex set of separable, i.e. non-entangled, bipartite density matrices. The algorithm d…
Probing the negative Wigner function of a pulsed single photon point by point
Kaisa Laiho, Katiuscia N. Cassemiro, David Gross +1
We investigate quantum properties of pulsed light fields point by point in phase space. We probe the negative region of the Wigner function of a single photon generated by the mean…