A5079185730- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Nuclear physics research studies
- Advanced Frequency and Time Standards
- Planetary Science and Exploration
- Quantum Information and Cryptography
- Astronomical Observations and Instrumentation
- Quantum Mechanics and Applications
- Ionosphere and magnetosphere dynamics
- Atomic and Molecular Physics
- Inertial Sensor and Navigation
- earthquake and tectonic studies
- Astro and Planetary Science
- Atomic and Subatomic Physics Research
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Quantum Chromodynamics and Particle Interactions
- Spacecraft Design and Technology
- Space Satellite Systems and Control
- Calibration and Measurement Techniques
- Orbital Angular Momentum in Optics
- Astronomy and Astrophysical Research
- Astronomical and nuclear sciences
- Geological and Geophysical Studies Worldwide
- Cold Atom Physics and Bose-Einstein Condensates
Agenzia Spaziale Italiana
2015-2024
Istituto di Radioastronomia di Bologna
2019
Istituto Nazionale di Ricerca Metrologica
2019
Istituto Nazionale di Fisica Nucleare
1981-2018
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2015-2018
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2011
Università di Camerino
1996-2010
University of Bonn
2004
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2002-2004
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
1990-2002
Quantum communication (QC), namely, the faithful transmission of generic quantum states, is a key ingredient information science. Here we demonstrate QC with polarization encoding from space to ground by exploiting satellite corner cube retroreflectors as transmitters in orbit and Matera Laser Ranging Observatory Italian Space Agency Matera, Italy, receiver. The bit error ratio (QBER) has been kept steadily low level suitable for several protocols, violation Bell inequalities or distribution...
We present the second realization of International Celestial Reference Frame (ICRF2) at radio wavelengths using nearly 30 years Very Long Baseline Interferometry observations.ICRF2 contains precise positions 3414 compact astronomical objects and has a positional noise floor ∼40 μas directional stability frame axes ∼10 μas.A set 295 new "defining" sources was selected on basis lack extensive intrinsic source structure.The these defining their more uniform sky distribution eliminates two...
Extending quantum communication to space environments would enable us perform fundamental experiments on physics as well applications of information at planetary and interplanetary scales. Here, we report the first experimental study conditions for implementation single-photon exchange between a satellite an Earth-based station. We built experiment that mimics single photon source satellite, exploiting telescope Matera Laser Ranging Observatory Italian Space Agency detect transmitted...
The Environmental Satellite (Envisat) mission was finished on April 8, 2012, and since that time, the attitude of satellite has undergone significant changes. During International Laser Ranging Service campaign, (SLR) stations have performed range measurements to allowed determination spin period Envisat during seven months 2013. axis is stable within radial coordinate system (RCS; fixed with orbit) pointing in direction opposite normal vector orbital plane such a way makes an angle 61.86°...
The nucleus 163Lu has been populated through the reaction 139La(29Si,5n) with a beam energy of 157 MeV. Three triaxial, strongly deformed (TSD) bands have observed very similar rotational properties. first excited TSD band earlier assigned as one-phonon wobbling excitation built on lowest-lying (yrast) band. large B(E2)(out)/B(E2)(in) value obtainable for one four transitions between second and is in good agreement particle-rotor calculations two-phonon excitation.
Quantum interference arising from the superposition of states is striking evidence validity quantum mechanics, confirmed in many experiments and also exploited applications. However, as for any scientific theory, mechanics valid within limits which it has been experimentally verified. In order to extend such limits, necessary observe unexplored conditions moving terminals at large distances space. Here, we demonstrate single photon a ground station due coherent two temporal modes reflected...
Extending the single-photon transmission distance is a basic requirement for implementation of quantum communication on global scale. In this work we report exchange from medium Earth orbit satellite (MEO) at more than $7000\phantom{\rule{0.28em}{0ex}}\text{km}$ slant to ground station Matera Laser Ranging Observatory. The transmitter was realized by exploiting corner cube retroreflectors mounted LAGEOS-2 satellite. Long duration data collection possible with such altitude, up 43 min in...
Among the most powerful techniques for exploration of Universe is very long baseline interferometry (VLBI), which based on simultaneous observation radio sources in sky with arrays distant ground-based antennas. One effects currently limiting its ultimate sensitivity phase-instability reference clocks adopted at each antenna. This term can be made negligible delivering same clock signal to multiple telescope sites using optical fibers. We realized such an infrastructure by disseminating a...
From Gibraltar to Anatolia, the active tectonics in Mediterranean is studied by means of an integrated approach based on geophysical, geodetic, and seismological methodologies. The aim this study gain a deep insight into kinematics dynamics crustal lithospheric processes affecting Mediterranean. Major tectonic processes, such as continental collision subduction, characterize region, which marks broad transition zone between African/Arabian Eurasian plates. A thin‐shell finite element allows...
Collective properties of the low-lying levels in odd-A Cu67–73 were investigated by Coulomb excitation with radioactive beams. The beams produced at ISOLDE and postaccelerated REX-ISOLDE up to 2.99 MeV/u. In Cu67,69, 1/2−, 5/2−, 7/2− states populated. Cu71,73, besides known transitions deexciting single-particle-like 5/2− core-coupled levels, γ rays 454 135 keV, respectively, observed for first time. Based on a reanalysis β-decay work comparison systematics, spin 1/2− is suggested these...
The European Space Agency (ESA) has supported a range of studies in the field quantum physics and information science space for several years, consequently we have submitted mission proposal Space-QUEST (Quantum Entanglement Experiments) to Life Physical Sciences Program. We propose perform space-to-ground communication tests from International Station (ISS). present proposed experiments as well design based payload.
Gedankenexperiments have consistently played a major role in the development of quantum theory. A paradigmatic example is Wheeler's delayed-choice experiment, wave-particle duality test that cannot be fully understood using only classical concepts. Here, we implement idea along satellite-ground interferometer which extends for thousands kilometers Space. We exploit temporal and polarization degrees freedom photons reflected by fast moving satellite equipped with retro-reflecting mirrors....
Neutron rich nuclei around 48Ca have been measured with the CLARA–PRISMA setup, making use of on 64Ni binary reactions, at 5.9 MeV/A. Angular distributions γ rays give evidence, in several transfer channels, for a large spin alignment (≈70%) perpendicular to reaction plane, it possible firmly establish and parities excited states. In case 49Ca, states arising from different types particle–core couplings are, first time, unambiguously identified basis angular distribution, polarization...
Abstract The (TOPography EXperiment) TOPEX/Poseidon (T/P) altimetry mission operated for 13 years before the satellite was decommissioned in January 2006, becoming a large space debris object at an altitude of 1,340 km. Since end mission, interaction T/P with environment has driven satellite's spin dynamics. Satellite laser ranging (SLR) measurements collected from June 2014 to October 2016 allow axis orientation be determined accuracy 1.7°. coincides platform yaw (formerly pointing nadir...
Satellite-based quantum communication (QC) is an invaluable resource for the realization of a network at global scale. In this regard, use satellites well beyond low Earth orbit gives advantage long time with ground station. However, high-orbit pose great technological challenge due to high diffraction losses optical channel, and experimental investigation such channels still lacking. Here, we report on first exchange single photons from navigation satellite system (GNSS) slant distance 20...
Rotational bands with strong magnetic dipole transitions have been observed in the doubly odd nuclei ${}^{82}\mathrm{Rb}$ and ${}^{84}\mathrm{Rb}$. These show characteristic features of rotation. They are first evidence this new kind nuclear excitation $A\ensuremath{\approx}80$ region. The results well reproduced within framework tilted axis cranking model on basis four-quasiparticle configurations type...
The satellites LAGEOS‐I and LAGEOS‐II are essential for the scientific study of various (geo)physical phenomena, such as geocenter motion absolute scale. high quality science products strongly depends on SLR observations that orbit description. Therefore all accelerations experienced by spacecraft need to be modeled accurately possible, thermal radiation forces being one them. Traditionally, this is done estimating so‐called empirical accelerations. However, rotational dynamics in particular...
Very Long Baseline Interferometry (VLBI) is a primary space-geodetic technique for determining precise coordinates on the Earth, monitoring variable Earth rotation and orientation with highest precision, deriving many other parameters of system. The International VLBI Service Geodesy Astrometry (IVS, http://ivscc.gsfc.nasa.gov/) service Association (IAG) Astronomical Union (IAU). datasets published here are results individual sessions in form normal equations SINEX 2.0 format...
Satellite quantum communications have rapidly evolved in the past few years, culminating proposal, development, and deployment of satellite missions dedicated to key distribution realization fundamental tests mechanics space. However, comparison with more mature technology based on fiber optics, several challenges are still open, such as capability detecting, high temporal accuracy, single photons coming from orbiting terminals. laser ranging, commonly used estimate distance, could also be...
Joint inversions of post‐glacial rebound‐induced secular changes in low degree harmonics the geopotential and true polar wander (TPW) systematically indicate that upper mantle viscosity has a value is considerably smaller than 10 21 Pas. The lower about one order magnitude larger viscosity. Discrepancies profiles inferred from even odd zonals are likely an indication recent, unmodeled glacial forcings and/or insufficient precision evaluation mass loss Pleistocene ice sheets. influence...