116 citations · 271 across the 10 of their papers we have counts for
9 papers · 1 filter
Coherence in quantum estimation
Paolo Giorda, Michele Allegra
The geometry of quantum states provides a unifying framework for estimation processes based on quantum probes, and it allows to derive the ultimate bounds of the achievable precisi…
Two-qubit correlations revisited: average mutual information, relevant (and useful) observables and an application to remote state preparation
Paolo Giorda, Michele Allegra
Understanding how correlations can be used for quantum communication protocols is a central goal of quantum information science. While many authors have linked global measures of c…
Global coherence of quantum evolutions based on decoherent histories: theory and application to photosynthetic quantum energy transport
Michele Allegra, Paolo Giorda, Seth Lloyd
Assessing the role of interference in natural and artificial quantum dyanamical processes is a crucial task in quantum information theory. To this aim, an appopriate formalism is p…
Algebraic synthesis of time-optimal unitaries in SU(2) with alternating controls
Clarice D. Aiello, Michele Allegra, Boerge Hemmerling +2
We present an algebraic framework to study the time-optimal synthesis of arbitrary unitaries in SU(2), when the control set is restricted to rotations around two non-parallel axes…
Quantum brachistochrone curves as geodesics: obtaining accurate control protocols for time-optimal quantum gates
Xiaoting Wang, Michele Allegra, Kurt Jacobs +3
Most methods of optimal control cannot obtain accurate time-optimal protocols. The quantum brachistochrone equation is an exception, and has the potential to provide accurate time-…
Non-Gaussian quantum discord for Gaussian states
Paolo Giorda, Michele Allegra, Matteo G. A. Paris
In recent years the paradigm based on entanglement as the unique measure of quantum correlations has been challenged by the rise of new correlation concepts, such as quantum discor…
Reply on "Comment on 'Role of initial entanglement and non-Gaussianity in the decoherence of photon-number entangled states evolving in a noisy channel' "
Michele Allegra, Paolo Giorda, Matteo G. A. Paris
In a recent work (Allegra et al, Phys. Rev. Lett. 105, 100503, 2010) we addressed the evolution of photon-number entangled states in noisy Gaussian channels. Upon exploiting severa…
Quantum discord and classical correlations in the bond-charge Hubbard model: quantum phase transitions, ODLRO and violation of the monogamy property for discord
Michele Allegra, Paolo Giorda, Arianna Montorsi
We study the quantum discord (QD) and the classical correlations (CC) in a reference model for strongly correlated electrons, the one-dimensional bond-charge extended Hubbard model…
The role of initial entanglement and nonGaussianity in the decoherence of photon number entangled states evolving in a noisy channel
Michele Allegra, Paolo Giorda, Matteo G. A. Paris
We address the degradation of continuous variable (CV) entanglement in a noisy channel focusing on the set of photon-number entangled states. We exploit several separability criter…