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12 papers · 2 filters
Quantum tomography as a tool for the characterization of optical devices
G. Mauro D'Ariano, Matteo G. A. Paris, Martina De Laurentis +2
We describe a novel tool for the quantum characterization of optical devices. The experimental setup involves a stable reference state that undergoes an unknown quantum transformat…
Optimal cloning for two pairs of orthogonal states
Dagmar Bruss, Chiara Macchiavello
We study the optimal cloning transformation for two pairs of orthogonal states of two-dimensional quantum systems, and derive the corresponding optimal fidelities.
Two-mode heterodyne phase detection
G. M. D'Ariano, M. F. Sacchi
We present an experimental scheme that achieves ideal phase detection on a two-mode field. The two modes and are the signal and image band modes of an heterodyne detector,…
Using entanglement improves precision of quantum measurements
G. Mauro D'Ariano, Paoloplacido Lo Presti, Matteo G. A. Paris
We show how entanglement can be used to improve the estimation of an unknown transformation. Using entanglement is always of benefit, in improving either the precision or the stabi…
Towards a tomographic picture of a Bose-Einstein condensate
Stefano Mancini, Mauro Fortunato, Paolo Tombesi +1
We investigate by means of numerical simulations the possibilities of tomographic techniques applied to a Bose-Einstein condensate in order to reconstruct its ground state. Essenti…
The Uniqueness Theorem for Entanglement Measures
Matthew J. Donald, Michal Horodecki, Oliver Rudolph
We explore and develop the mathematics of the theory of entanglement measures. After a careful review and analysis of definitions, of preliminary results, and of connections betwee…