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- University of FlorenceIT61 papers
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18 papers · 1 filter
A microcanonical entropy correcting finite-size effects in small systems
Roberto Franzosi
In a recent paper [Franzosi, Physica A {\bf 494}, 302 (2018)], we have suggested to use of the surface entropy, namely the logarithm of the area of a hypersurface of constant energ…
Metrological Nonlinear Squeezing Parameter
Manuel Gessner, Augusto Smerzi, Luca Pezzè
The well known metrological linear squeezing parameters (such as quadrature or spin squeezing) efficiently quantify the sensitivity of Gaussian states. Yet, these parameters are in…
Entanglement estimation in non-optimal qubit states
Stefano Scali, Roberto Franzosi
In the last years, a relationship has been established between the quantum Fisher information (QFI) and quantum entanglement. In the case of two-qubit systems, all pure entangled s…
Advances in sequential measurement and control of open quantum systems
Stefano Gherardini, Andrea Smirne, Matthias M. Müller +1
Novel concepts, perspectives and challenges in measuring and controlling an open quantum system via sequential schemes are shown. We discuss how similar protocols, relying both on…
Multipartite-Entanglement Tomography of a Quantum Simulator
Marco Gabbrielli, Luca Lepori, Luca Pezzè
Multipartite entanglement tomography, namely the quantum Fisher information (QFI) calculated with respect to different collective operators, allows to fully characterize the phase…
Tight bounds for private communication over bosonic Gaussian channels based on teleportation simulation with optimal finite resources
Riccardo Laurenza, Spyros Tserkis, Leonardo Banchi +3
Upper bounds for private communication over quantum channels can be derived by adopting channel simulation, protocol stretching, and relative entropy of entanglement. All these ing…