403 citations · 1.2k across the 15 of their papers we have counts for
7 papers · 1 filter
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…
Applications of the group SU(1,1) for quantum computation and tomography
G. Chiribella, G. M. D'Ariano, P. Perinotti
This paper collects miscellaneous results about the group SU(1,1) that are helpful in applications in quantum optics. Moreover, we derive two new results, the first is about the ap…
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…
Secret quantum communication of a reference frame
Giulio Chiribella, Lorenzo Maccone, Paolo Perinotti
We propose quantum cryptographic protocols to secretly communicate a reference frame- unspeakable information in the sense it cannot be encoded into a string of bits. Two distant p…
Quantum information becomes classical when distributed to many users
G. Chiribella, G. M. D'Ariano
Any physical transformation that equally distributes quantum information over a large number M of users can be approximated by a classical broadcasting of measurement outcomes. The…
Extremal covariant measurements
G. Chiribella, G. M. D'Ariano
We characterize the extremal points of the convex set of quantum measurements that are covariant under a finite-dimensional projective representation of a compact group, with actio…