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Structural approximations to positive maps and entanglement breaking channels
J. K. Korbicz, M. L. Almeida, J. Bae +2
Structural approximations to positive, but not completely positive maps are approximate physical realizations of these non-physical maps. They find applications in the design of di…
Enhancement of Entanglement Percolation in Quantum Networks via Lattice Transformations
G. John Lapeyre, Jan Wehr, Maciej Lewenstein
We study strategies for establishing long-distance entanglement in quantum networks. Specifically, we consider networks consisting of regular lattices of nodes, in which the neares…
Cold Fermi atomic gases in a pumped optical resonator
Jonas Larson, Giovanna Morigi, Maciej Lewenstein
We study systems of fully polarized ultracold atomic gases obeying Fermi statistics. The atomic transition interacts dispersively with a mode of a standing-wave cavity, which is co…
Fermion- and Spin-Counting in Strongly Correlated Systems
Sibylle Braungardt, Aditi Sen De, Ujjwal Sen +2
We apply the atom counting theory to strongly correlated Fermi systems and spin models, which can be realized with ultracold atoms. The counting distributions are typically sub-Poi…
Entanglement Enhances Security in Secret Sharing
Rafal Demkowicz-Dobrzanski, Aditi Sen De, Ujjwal Sen +1
We analyze tolerable quantum bit error rates in secret sharing protocols, and show that using entangled encoding states is advantageous in the case when the eavesdropping attacks a…