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20 papers · 2 filters
Classical to quantum in large number limit
Kavan Modi, Rosario Fazio, Saverio Pascazio +2
We construct a quantumness witness following the work of Alicki and van Ryn (AvR) in "A simple test of quantumness for a single system" [J. Phys. A: Math. Theor., vol. 41, 062001 (…
Optimal correlations in many-body quantum systems
Luigi Amico, Davide Rossini, Alioscia Hamma +1
Information and correlations in a quantum system are closely related through the process of measurement. We explore such relation in a many-body quantum setting, effectively bridgi…
High-fidelity quantum driving
Mark G. Bason, Matthieu Viteau, Nicola Malossi +7
The ability to accurately control a quantum system is a fundamental requirement in many areas of modern science such as quantum information processing and the coherent manipulation…
Quantum measurement bounds beyond the uncertainty relations
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
We give a bound to the precision in the estimation of a parameter in terms of the expectation value of an observable. It is an extension of the Cramer-Rao inequality and of the Hei…
Geometric phase kickback in a mesoscopic qubit-oscillator system
G. Vacanti, R. Fazio, M. S. Kim +3
We illustrate a reverse Von Neumann measurement scheme in which a geometric phase induced on a quantum harmonic oscillator is measured using a microscopic qubit as a probe. We show…
Local-channel-induced rise of quantum correlations in continuous-variable systems
Francesco Ciccarello, Vittorio Giovannetti
It was recently discovered that the quantum correlations of a pair of disentangled qubits, as measured by the quantum discord, can increase solely because of their interaction with…