403 citations · 1.3k across the 41 of their papers we have counts for
16 papers · 2 filters
Joint estimation of real squeezing and displacement
G. Chiribella, G. M. D'Ariano, M. F. Sacchi
We study the problem of joint estimation of real squeezing and amplitude of the radiation field, deriving the measurement that maximizes the probability density of detecting the tr…
Optimal estimation of quantum observables
Giacomo Mauro D'Ariano, Vittorio Giovannetti, Paolo Perinotti
We consider the problem of estimating the ensemble average of an observable on an ensemble of equally prepared identical quantum systems. We show that, among all kinds of measureme…
Optimal superbroadcasting of mixed qubit states
Francesco Buscemi, Giacomo Mauro D'Ariano, Chiara Macchiavello +1
"Broadcasting", namely distributing information over many users, suffers in-principle limitations when the information is quantum. This poses a critical issue in quantum informatio…
Programmable quantum channels and measurements
Giacomo Mauro D'Ariano, Paolo Perinotti
We review some partial results for two strictly related problems. The first problem consists in finding the optimal joint unitary transformation on system and ancilla which is the…
On the most efficient unitary transformation for programming quantum channels
Giacomo Mauro D'Ariano, Paolo Perinotti
We address the problem of finding the optimal joint unitary transformation on system + ancilla which is the most efficient in programming any desired channel on the system by chang…
Extremal quantum cloning machines
G. Chiribella, G. M. D'Ariano, P. Perinotti +1
We investigate the problem of cloning a set of states that is invariant under the action of an irreducible group representation. We then characterize the cloners that are "extremal…