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4 papers · 2 filters
Resonance asymptotics in the generalized Winter model
Pavel Exner, Martin Fraas
We consider a modification of the Winter model describing a quantum particle in presence of a spherical barrier given by a fixed generalized point interaction. It is shown that the…
Completely positive covariant two-qubit quantum processes and optimal quantum NOT operations for entangled qubit pairs
J. Novotny, G. Alber, I. Jex
The structure of all completely positive quantum operations is investigated which transform pure two-qubit input states of a given degree of entanglement in a covariant way. Specia…
The decay law can have an irregular character
Pavel Exner, Martin Fraas
Within a well-known decay model describing a particle confined initially within a spherical potential shell, we consider the situation when the undecayed state has an unusual e…
Experimentally realizable quantum comparison of coherent states and its applications
Erika Andersson, Marcos Curty, Igor Jex
When comparing quantum states to each other, it is possible to obtain an unambiguous answer, indicating that the states are definitely different, already after a single measurement…