Publications (9)
Clean Positive Operator Valued Measures
F. Buscemi, G. M. D'Ariano, M. Keyl +2
In quantum mechanics the statistics of the outcomes of a measuring apparatus is described by a positive operator valued measure (POVM). A quantum channel transforms POVM's into POV…
Physical realizations of quantum operations
F. Buscemi, G. M. D'Ariano, M. F. Sacchi
Quantum operations (QO) describe any state change allowed in quantum mechanics, such as the evolution of an open system or the state change due to a measurement. We address the pro…
Unitary realizations of the ideal phase measurement
F. Buscemi, G. M. D'Ariano, M. F. Sacchi
We explicitly construct a large class of unitary transformations that allow to perform the ideal estimation of the phase-shift on a single-mode radiation field. The ideal phase dis…
Optimal realization of the transposition maps
F. Buscemi, G. M. D'Ariano, P. Perinotti +1
We solve the problem of achieving the optimal physical approximation of the transposition for pure states of arbitrary quantum systems for finite and infinite dimensions. A unitary…
Dynamics of quantum correlations in colored environments
C. Benedetti, F. Buscemi, P. Bordone +1
We address the dynamics of entanglement and quantum discord for two non interacting qubits initially prepared in a maximally entangled state and then subjected to a classical color…
Causality and Localization Operators
F. Buscemi, G. Compagno
The evolution of the expectation values of one and two points scalar field operators and of positive localization operators, generated by an istantaneous point source is non local.…
Quantum erasure of decoherence
F. Buscemi, G. Chiribella, G. M. D'Ariano
We consider the classical algebra of observables that are diagonal in a given orthonormal basis, and define a complete decoherence process as a completely positive map that asympto…
There exist non orthogonal quantum measurements that are perfectly repeatable
F. Buscemi, G. M. D'Ariano, P. Perinotti
We show that, contrarily to the widespread belief, in quantum mechanics repeatable measurements are not necessarily described by orthogonal projectors--the customary paradigm of "o…
Superbroadcasting and classical information
G. Chiribella, G. M. D'Ariano, C. Macchiavello +2
We address the problem of broadcasting N copies of a generic qubit state to M>N copies by estimating its direction and preparing a suitable output state according to the outcome of…