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8 papers · 2 filters
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…
A dynamical model for quantum memory channels
Vittorio Giovannetti
A dynamical model for quantum channel is introduced which allows one to pass continuously from the memoryless case to the case in which memory effects are present. The quantum and…
Robust gates for holonomic quantum computation
G. Florio, P. Facchi, R. Fazio +2
Non Abelian geometric phases are attracting increasing interest because of possible experimental application in quantum computation. We study the effects of the environment (modell…
Quantum metrology
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
We point out a general framework that encompasses most cases in which quantum effects enable an increase in precision when estimating a parameter (quantum metrology). The typical q…
Multipartite entanglement generation and fidelity decay in disordered qubit systems
Simone Montangero, Lorenza Viola
We investigate multipartite entanglement dynamics in disordered spin-1/2 lattice models exhibiting a transition from integrability to quantum chaos. Borrowing from the recently int…
A scheme for entanglement extraction from a solid
G. De Chiara, C. Brukner, R. Fazio +2
Some thermodynamical properties of solids, such as heat capacity and magnetic susceptibility, have recently been shown to be linked to the amount of entanglement in a solid. Howeve…