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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…
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…