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Search Results: 1 - 10 of 7660 matches for " Paolo Martini "
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Optimizing Optimal Reduction: A Type Inference Algorithm for Elementary Affine Logic
Paolo Coppola,Simone Martini
Computer Science , 2003,
Abstract: We present a type inference algorithm for lambda-terms in Elementary Affine Logic using linear constraints. We prove that the algorithm is correct and complete.
Overview of Micro- and Nano-Technology Tools for Stem Cell Applications: Micropatterned and Microelectronic Devices
Stefano Cagnin,Elisa Cimetta,Carlotta Guiducci,Paolo Martini,Gerolamo Lanfranchi
Sensors , 2012, DOI: 10.3390/s121115947
Abstract: In the past few decades the scientific community has been recognizing the paramount role of the cell microenvironment in determining cell behavior. In parallel, the study of human stem cells for their potential therapeutic applications has been progressing constantly. The use of advanced technologies, enabling one to mimic the in vivo stem cell microenviroment and to study stem cell physiology and physio-pathology, in settings that better predict human cell biology, is becoming the object of much research effort. In this review we will detail the most relevant and recent advances in the field of biosensors and micro- and nano-technologies in general, highlighting advantages and disadvantages. Particular attention will be devoted to those applications employing stem cells as a sensing element.
Extending Resource Access in Multi-Provider Networks Using Trust Management
Maurizio Colombo,Fabio Martinelli,Paolo Mori,Barbara Martini
International Journal of Computer Networks & Communications , 2011,
Abstract: Resource access control in a multi-provider scenario requires an authorization mechanism such that users are granted seamless access to resources (connectivity services, application services and contents) in different provider domains. This paper proposes the integration of a Role-based authorization system in a network service provisioning framework, in order to support multi-provider networks. This authorization system allows the access to provider’s services by unknown users, i.e. users that have been registered in different administrative domains, provided that those domains have trust relations with the original one. By removing the user subscription as pre-condition for resource access, the proposed access model offers increasing opportunities for service delivery and resource usage with benefits forboth providers and users. The paper presents the architecture of the proposed system, along with a reference implementation and the evaluation of the delay in the service delivery time introduced by the proposed security support.
Generation of time-bin entangled photons without temporal post-selection
Alessandro Rossi,Giuseppe Vallone,Francesco De Martini,Paolo Mataloni
Physics , 2008, DOI: 10.1103/PhysRevA.78.012345
Abstract: We report on the implementation of a new interferometric scheme that allows the generation of photon pairs entangled in the time-energy degree of freedom. This scheme does not require any kind of temporal post-selection on the generated pairs and can be used even with lasers with short coherence time.
One-way quantum computation via manipulation of polarization and momentum qubits in two-photon cluster states
Giuseppe Vallone,Enrico Pomarico,Francesco De Martini,Paolo Mataloni
Physics , 2007, DOI: 10.1002/lapl.200710140
Abstract: 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 equatorial qubits with high values of fidelity. By the computational equivalence of the two degrees of freedom our result demonstrate the suitability of two photon cluster states for rapid and efficient one-way quantum computing.
Active one-way quantum computation with 2-photon 4-qubit cluster states
Giuseppe Vallone,Enrico Pomarico,Francesco De Martini,Paolo Mataloni
Physics , 2007, DOI: 10.1103/PhysRevLett.100.160502
Abstract: 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 are automatically implemented by properly choosing the measurement basis of the qubits, while Pauli error corrections are realized by using two fast driven Pockels cells. We realized also a C-NOT gate for equatorial qubits and a C-Phase gate for a generic target qubit. Our results demonstrate that 2-photon cluster states can be used for rapid and efficient deterministic one-way quantum computing.
Hyperentanglement witness
Giuseppe Vallone,Raino Ceccarelli,Francesco De Martini,Paolo Mataloni
Physics , 2008, DOI: 10.1103/PhysRevA.78.062305
Abstract: A new criterium to detect the entanglement present in a {\it hyperentangled state}, based on the evaluation of an entanglement witness, is presented. We show how some witnesses recently introduced for graph states, measured by only two local settings, can be used in this case. We also define a new witness $W_3$ that improves the resistance to noise by increasing the number of local measurements.
Polarization entanglement with GRaded-INdex lenses
Giuseppe Vallone,Gaia Donati,Francesco De Martini,Paolo Mataloni
Physics , 2009, DOI: 10.1063/1.3257376
Abstract: By using an optical device based on the integration of a GRaded-INdex (GRIN) rod lens and a single-mode optical fiber we efficiently collected photon pairs generated by spontaneous parametric down-conversion. We show that this system preserves the polarization entanglement of the 2-photon states. Hence this device, characterized by a remarkable easiness of alignment and allowing for high coupling efficiency of single-mode radiation, can be used with photons entangled in various degrees of freedom, such as polarization and spatial momentum, and to interconnect different sides of complex optical circuits.
One-way quantum computation with two-photon multiqubit cluster states
Giuseppe Vallone,Enrico Pomarico,Francesco De Martini,Paolo Mataloni
Physics , 2008, DOI: 10.1103/PhysRevA.78.042335
Abstract: We describe in detail the application of four qubit cluster states, built on the simultaneous entanglement of two photons in the degrees of freedom of polarization and linear momentum, for the realization of a complete set of basic one-way quantum computation operations. These consist of arbitrary single qubit rotations, either probabilistic or deterministic, and simple two qubit gates, such as a c-not gate for equatorial qubits and a universal c-phase (CZ) gate acting on arbitrary target qubits. Other basic computation operations, such as the Grover's search and the Deutsch's algorithms, have been realized by using these states. In all the cases we obtained a high value of the operation fidelities. These results demonstrate that cluster states of two photons entangled in many degrees of freedom are good candidates for the realization of more complex quantum computation operations based on a larger number of qubits.
Generating entangled superpositions of macroscopically distinguishable states within a parametric oscillator
Francesco De Martini,Mauro Fortunato,Paolo Tombesi,David Vitali
Physics , 1999, DOI: 10.1103/PhysRevA.60.1636
Abstract: We suggest a variant of the recently proposed experiment for the generation of a new kind of Schroedinger-cat states, using two coupled parametric down-converter nonlinear crystals [F. De Martini, Phys. Rev. Lett. 81, 2842 (1998)]. We study the parametric oscillator case and find that an entangled Schroedinger-cat type state of two cavities, whose mirrors are placed along the output beams of the nonlinear crystals, can be realized under suitable conditions.
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