1.5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of PaduaIT221 papers
- University of PalermoIT137 papers
- Centre National de la Recherche ScientifiqueFR115 papers
- University of MilanIT114 papers
- Sapienza University of RomeIT98 papers
- University of InsubriaIT98 papers
- University of PaviaIT89 papers
- University of SalernoIT87 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di MilanoIT76 papers
- Roma Tre UniversityIT63 papers
- University of Naples Federico IIIT61 papers
- Istituto Nazionale di Fisica NucleareIT59 papers
29 papers · 2 filters
Active one-way quantum computation with 2-photon 4-qubit cluster states
Giuseppe Vallone, Enrico Pomarico, Francesco De Martini +1
By using 2-photon 4-qubit cluster states we demonstrate deterministic one-way quantum computation in single qubit rotation algorithm. In this operation feed-forward measurements ar…
Quantum state decorrelation
Giacomo M. D'Ariano, Rafal Demkowicz-Dobrzanski, Paolo Perinotti +1
We address the general problem of removing correlations from quantum states while preserving local quantum information as much as possible. We provide a complete solution in the ca…
Correspondence between field generalized binomial states and coherent atomic states
Rosario Lo Franco, Giuseppe Compagno, Antonino Messina +1
We show that the -photon generalized binomial states of electromagnetic field may be put in a bijective mapping with the coherent atomic states of two-level atoms. We exploi…
Memory effects in quantum information transmission across a Hamiltonian dephasing channel
A. D'Arrigo, G. Benenti, G. Falci
We study a dephasing channel with memory, modelled by a multimode environment of oscillators. Focusing on the case of two channel uses, we show that memory effects can enhance the…
Extraction of Singlet States from Noninteracting High-Dimensional Spins
Francesco Ciccarello, Mauro Paternostro, Myungshik S. Kim +1
We present a scheme for the extraction of singlet states of two remote particles of arbitrary quantum spin number. The goal is achieved through post-selection of the state of inter…
High-sensitivity imaging with multi-mode twin beams
E. Brambilla, L. Caspani, O. Jedrkiewicz +2
Twin entangled beams produced by single-pass parametric down-conversion (PDC) offer the opportunity to detect weak amount of absorption with an improved sensitivity with respect to…
Quantum simulation of the single-particle Schrodinger equation
Giuliano Benenti, Giuliano Strini
The working of a quantum computer is described in the concrete example of a quantum simulator of the single-particle Schrodinger equation. We show that a register of 6-10 qubits is…
Casimir-Polder interatomic potential between two atoms at finite temperature and in the presence of boundary conditions
R. Passante, S. Spagnolo
We evaluate the Casimir-Polder potential between two atoms in the presence of an infinite perfectly conducting plate and at nonzero temperature. In order to calculate the potential…
Quantum indirect estimation theory and joint estimate of all moments of two incompatible observables
Giacomo Mauro D'Ariano, Paolo Perinotti, Massimiliano Federico Sacchi
We introduce the quantum indirect estimation theory, which provides a general framework to address the problem of which ensemble averages can be estimated by means of an available…
Quantum criticality as a resource for quantum estimation
Paolo Zanardi, Matteo G A Paris, Lorenzo Campos Venuti
We address quantum critical systems as a resource in quantum estimation and derive the ultimate quantum limits to the precision of any estimator of the coupling parameters. In part…
Experimental macroscopic coherence by phase-covariant cloning of a single photon
Eleonora Nagali, Tiziano De Angelis, Fabio Sciarrino +1
We investigate the multiphoton states generated by high-gain optical parametric amplification of a single injected photon, polarization encoded as a ''qubit''. The experiment confi…
Experimental Realization of Polarization Qutrits from Non-Maximally Entangled States
Giuseppe Vallone, Enrico Pomarico, Paolo Mataloni +2
Based on a recent proposal [Phys. Rev. A 71, 062337 (2005)], we have experimentally realized two photon polarization qutrits by using non-maximally entangled states and linear opti…
One-way quantum computation via manipulation of polarization and momentum qubits in two-photon cluster states
Giuseppe Vallone, Enrico Pomarico, Francesco De Martini +1
Four-qubit cluster states of two photons entangled in polarization and linear momentum have been used to realize a complete set of single qubit rotations and the C-NOT gate for equ…
Robust and efficient generator of almost maximal multipartite entanglement
Davide Rossini, Giuliano Benenti
Quantum chaotic maps can efficiently generate pseudo-random states carrying almost maximal multipartite entanglement, as characterized by the probability distribution of bipartite…
Alternative linear structures for classical and quantum systems
E. Ercolessi, A. Ibort, G. Marmo +1
The possibility of deforming the (associative or Lie) product to obtain alternative descriptions for a given classical or quantum system has been considered in many papers. Here we…
Ray space Riccati evolution and geometric phases for N-level quantum systems
S. Chaturvedi, E. Ercolessi, G. Marmo +3
We present a simple derivation of the matrix Riccati equations governing the reduced dynamics as one descends from the group U(N) describing the Schroedinger evolution of an N-leve…
Optimal phase estimation in quantum networks
Wim van Dam, G. Mauro D'Ariano, Artur Ekert +2
We address the problem of estimating the phase phi given N copies of the phase rotation u(phi) within an array of quantum operations in finite dimensions. We first consider the spe…
Characterization of separability and entanglement in - and -dimensional systems by single-qubit and single-qutrit unitary transformations
Salvatore M. Giampaolo, Fabrizio Illuminati
We investigate the geometric characterization of pure state bipartite entanglement of - and -dimensional composite quantum systems. To this aim, we anal…
Teleportation of atomic states via position measurements
Michele Tumminello, Francesco Ciccarello
We present a scheme for conditionally teleporting an unknown atomic state in cavity QED, which requires two atoms and one cavity mode. The translational degrees of freedom of the a…
Experimental test of the no signaling theorem
Tiziano De Angelis, Francesco De Martini, Eleonora Nagali +1
In 1981 N. Herbert proposed a gedanken experiment in order to achieve by the ''First Laser Amplified Superluminal Hookup'' (FLASH) a faster than light communication (FTL) by quantu…
Reconstruction of the photon distribution in a micromaser
Stefano Olivares, Federico Casagrande, Alfredo Lulli +1
We suggest an iterative, maximum-likelihood-based, method to reconstruct the photon number distribution of the steady state cavity field of a micromaser starting from the statistic…
Ground-state cooling of a micromechanical oscillator: generalized framework for cold damping and cavity-assisted cooling schemes
Claudiu Genes, David Vitali, Paolo Tombesi +2
We provide a general framework to describe cooling of a micromechanical oscillator to its quantum ground state by means of radiation-pressure coupling with a driven optical cavity.…
Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains
L. Campos Venuti, C. Degli Esposti Boschi, M. Roncaglia
We explore the capability of spin-1/2 chains to act as quantum channels for both teleportation and transfer of qubits. Exploiting the emergence of long-distance entanglement in low…
Phase-covariant cloning of coherent states
Massimiliano F. Sacchi
We consider the problem of phase-covariant cloning for coherent states. We show that an experimental scheme based on ideal phase measurement and feedforward outperforms the semicla…