10.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Sapienza University of RomeIT156 papers
- Scuola Internazionale Superiore di Studi AvanzatiIT146 papers
- University of InsubriaIT88 papers
- University of MilanIT85 papers
- University of TrentoIT85 papers
- Politecnico di TorinoIT78 papers
- University of FlorenceIT74 papers
- University of GenoaIT69 papers
- Centre National de la Recherche ScientifiqueFR65 papers
- The Abdus Salam International Centre for Theoretical Physics (ICTP)IT65 papers
- National Research CouncilLK58 papers
- University of SalernoIT56 papers
14 papers · 2 filters
Entanglement and factorized ground states in two-dimensional quantum antiferromagnets
Tommaso Roscilde, Paola Verrucchi, Andrea Fubini +2
Making use of exact results and quantum Monte Carlo data for the entanglement of formation, we show that the ground state of anisotropic two-dimensional S=1/2 antiferromagnets in a…
Quantum-enhanced measurements: beating the standard quantum limit
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
Quantum mechanics, through the Heisenberg uncertainty principle, imposes limits to the precision of measurement. Conventional measurement techniques typically fail to reach these l…
Entanglement in quantum critical spin systems
Tommaso Roscilde, Paola Verrucchi, Andrea Fubini +2
We study the field dependence of the entanglement of formation in anisotropic S=1/2 antiferromagnetic chains and two-leg ladders displaying a T=0 field-driven quantum phase transit…
Realization of the 1->3 optimal phase-covariant quantum cloning machine
Fabio Sciarrino, Francesco De Martini
The 1->3 quantum phase covariant cloning, which optimally clones qubits belonging to the equatorial plane of the Bloch sphere, achieves the fidelity Fcov(1->3)=0.833, larger than f…
Realization of the Optimal Universal Quantum Entangler
Fabio Sciarrino, Francesco De Martini, Vladimir Buzek
We present the first experimental demonstration of the ''optimal'' and ''universal'' quantum entangling process involving qubits encoded in the polarization of single photons. The…
Entanglement Across a Transition to Quantum Chaos
Carlos Mejia-Monasterio, Giuliano Benenti, Gabriel G. Carlo +1
We study the relation between entanglement and quantum chaos in one- and two-dimensional spin-1/2 lattice models, which exhibit mixing of the noninteracting eigenfunctions and tran…
Two atoms in an anisotropic harmonic trap
Z. Idziaszek, T. Calarco
We consider the system of two interacting atoms confined in axially symmetric harmonic trap. Within the pseudopotential approximation, we solve the Schroedinger equation exactly, d…
Classical randomness in quantum measurements
Giacomo Mauro D'Ariano, Paoloplacido Lo Presti, Paolo Perinotti
Similarly to quantum states, also quantum measurements can be "mixed", corresponding to a random choice within an ensemble of measuring apparatuses. Such mixing is equivalent to a…
Realization of Universal Optimal Quantum Machines by Projective Operators and Stochastic Maps
F. Sciarrino, C. Sias, M. Ricci +1
Optimal quantum machines can be implemented by linear projective operations. In the present work a general qubit symmetrization theory is presented by investigating the close links…
Uniform semiclassical approach to fidelity decay in the deep Lyapunov regime
Wen-ge Wang, G. Casati, Baowen Li +1
We use the uniform semiclassical approximation in order to derive the fidelity decay in the regime of large perturbations. Numerical computations are presented which agree with our…
Logarithmic divergence of the block entanglement entropy for the ferromagnetic Heisenberg model
Vladislav Popkov, Mario Salerno
Recent studies have shown that logarithmic divergence of entanglement entropy as function of size of a subsystem is a signature of criticality in quantum models. We demonstrate tha…
Experimental Purification of Single Qubits
M. Ricci, F. De Martini, N. J. Cerf +3
We report the experimental realization of the purification protocol for single qubits sent through a depolarization channel. The qubits are associated with polarization encoded pho…
Simulating noisy quantum protocols with quantum trajectories
Gabriel G. Carlo, Giuliano Benenti, Giulio Casati +1
The theory of quantum trajectories is applied to simulate the effects of quantum noise sources induced by the environment on quantum information protocols. We study two models that…
Quantum computing and information extraction for a dynamical quantum system
Giuliano Benenti, Giulio Casati, Simone Montangero
We discuss the simulation of a complex dynamical system, the so-called quantum sawtooth map model, on a quantum computer. We show that a quantum computer can be used to efficiently…