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12 papers · 2 filters
Informationally complete measurements and groups representation
G. M. D'Ariano, P. Perinotti, M. F. Sacchi
Informationally complete measurements on a quantum system allow to estimate the expectation value of any arbitrary operator by just averaging functions of the experimental outcomes…
Entanglement production by quantum error correction in the presence of correlated environment
G. De Chiara, R. Fazio, C. Macchiavello +1
We analyze the effect of a quantum error correcting code on the entanglement of encoded logical qubits in the presence of a dephasing interaction with a correlated environment. Suc…
Entanglement and purity of two-mode Gaussian states in noisy channels
Alessio Serafini, Fabrizio Illuminati, Matteo G. A. Paris +1
We study the evolution of purity, entanglement and total correlations of general two--mode Gaussian states of continuous variable systems in arbitrary uncorrelated Gaussian environ…
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…
Quantum universal detectors
G. M. D'Ariano, P. Perinotti, M. F. Sacchi
We address the problem of estimating the expectation value <O> of an arbitrary operator O via a universal measuring apparatus that is independent of O, and for which the expectatio…
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…