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12 papers · 2 filters
Cross-Phase Modulation and Population Redistribution in a Periodic Tripod Medium
K. Slowik, A. Raczynski, J. Zaremba +3
The cross-Kerr effect is studied for two pulses propagating in an atomic medium in a tripod configuration, dressed by a strong standing wave coupling beam. Nonlinear phase shifts f…
Optimal entanglement witnesses from generalized reduction and Robertson maps
Dariusz Chruściński, Justyna Pytel
We provide a generalization of the reduction and Robertson positive maps in matrix algebras. They give rise to a new class of optimal entanglement witnesses. Their structural physi…
Bell diagonal states with maximal abelian symmetry
Dariusz Chruscinski, Andrzej Kossakowski
We provide a simple class of 2-qudit states for which one is able to formulate necessary and sufficient conditions for separability. As a byproduct we generalize well known constru…
From Markovian semigroup to non-Markovian quantum evolution
Dariusz Chruscinski, Andrzej Kossakowski
We provided a class of legitimate memory kernels leading to completely positive trace preserving dynamical maps. Our construction is based on a simple normalization procedure. Inte…
Experimental Extraction of Secure Correlations from a Noisy Private State
Krzysztof Dobek, Michal Karpinski, Rafal Demkowicz-Dobrzanski +2
We report experimental generation of a noisy entangled four-photon state that exhibits a separation between the secure key contents and distillable entanglement, a hallmark feature…
Rate analysis for a hybrid quantum repeater
Nadja K. Bernardes, Ludmiła Praxmeyer, Peter van Loock
We present a detailed rate analysis for a hybrid quantum repeater assuming perfect memories and using optimal probabilistic entanglement generation and deterministic swapping routi…