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- University of GdańskPL161 papers
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7 papers · 2 filters
Vacuum Rabi oscillation in nonzero-temperature open cavity
Patrycja Stefańska, Marcin Wilczewski, Marek Czachor
Comparison of theory of Rabi oscillations with experiment [M. Wilczewski and M. Czachor, Phys. Rev. A {\bf 79}, 033836 (2009)] suggests that cavity lifetime parameters obtained in…
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…
Reexamination of determinant-based separability test for two qubits
Maciej Demianowicz
It was shown in [Augusiak et al.,\;Phys. Rev. A \textbf{77}, 030301(R) (2008)] that discrimination between entanglement and separability in a two qubit state can be achieved by a m…
On structural physical approximations and entanglement breaking maps
Remigiusz Augusiak, Joonwoo Bae, Łukasz Czekaj +1
Very recently a conjecture saying that the so-called structural physical approximations (SPAa) to optimal positive maps (optimal entanglement witnesses) give entanglement breaking…
Efficient bounds on quantum communication rates via their reduced variants
Marcin L. Nowakowski, Pawel Horodecki
We investigate one-way communication scenarios where Bob manipulating on his parts can transfer some sub-system to the environment. We define reduced versions of quantum communicat…
Two-spinors, oscillator algebras, and qubits: Aspects of manifestly covariant approach to relativistic quantum information
Marek Czachor
The first part of the paper reviews applications of 2-spinor methods to relativistic qubits (analogies between tetrads in Minkowski space and 2-qubit states, qubits defined by mean…