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13 papers · 2 filters
Tomography of Quantum Operations
G. M. D'Ariano, P. Lo Presti
Quantum operations describe any state change allowed in quantum mechanics, including the evolution of an open system or the state change due to a measurement. In this letter we pre…
Continuous variable cloning via network of parametric gates
G. M. D'Ariano, F. De Martini, M. F. Sacchi
We propose an experimental scheme for the cloning machine of continuous quantum variables through a network of parametric amplifiers working as input-output four-port gates.
Approximate quantum cloning and the impossibility of superluminal information transfer
D. Bruss, G. M. D'Ariano, C. Macchiavello +1
We show that nonlocality of quantum mechanics cannot lead to superluminal transmission of information, even if most general local operations are allowed, as long as they are linear…
Characterising a universal cloning machine by maximum-likelihood estimation
Massimiliano F. Sacchi
We apply a general method for the estimation of completely positive maps to the 1-to-2 universal covariant cloning machine. The method is based on the maximum-likelihood principle,…
Maximum-likelihood reconstruction of CP maps
Massimiliano F. Sacchi
We present a method for the determination of the completely positive (CP) map describing a physical device based on random preparation of the input states, random measurements at t…
Joint measurements via quantum cloning
G. M. D'Ariano, C. Macchiavello, M. F. Sacchi
We explore the possibility of achieving optimal joint measurements of noncommuting observables on a single quantum system by performing conventional measurements of commuting self…