A5042213097- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Scientific Measurement and Uncertainty Evaluation
- Quantum Mechanics and Applications
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Radioactive Decay and Measurement Techniques
- Geophysics and Sensor Technology
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- Semiconductor Lasers and Optical Devices
- Noncommutative and Quantum Gravity Theories
- Cosmology and Gravitation Theories
- Relativity and Gravitational Theory
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Quantum Electrodynamics and Casimir Effect
- Mechanical and Optical Resonators
- Molecular spectroscopy and chirality
- Particle physics theoretical and experimental studies
- Advanced Measurement and Metrology Techniques
New York University Florence
2025
Florence (Netherlands)
2025
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2015-2024
University of Florence
2014-2024
Nello Carrara Institute of Applied Physics
2018-2023
European Theoretical Spectroscopy Facility
2011-2021
Istituto Nazionale di Fisica Nucleare
2007-2013
Netherlands Institute for Radio Astronomy
2013
Physikalisch-Technische Bundesanstalt
2012
European Space Research and Technology Centre
2009
We report on a conceptually new test of the equivalence principle performed by measuring acceleration in Earth's gravity field two isotopes strontium atoms, namely, bosonic (88)Sr isotope which has no spin versus fermionic (87)Sr half-integer spin. The effect atomic species been probed means precision differential measurement Bloch frequency for matter waves vertical optical lattice. obtain values η=(0.2±1.6)×10(-7) Eötvös parameter and k=(0.5±1.1)×10(-7) coupling between nuclear gravity....
The theory of general relativity describes macroscopic phenomena driven by the influence gravity while quantum mechanics brilliantly accounts for microscopic effects.Despite their tremendous individual success, a complete unification fundamental interactions is missing and remains one most challenging important quests in modern theoretical physics.The STE-QUEST satellite mission, proposed as medium-size mission within Cosmic Vision program European Space Agency (ESA), aims testing with high...
We evaluate the sensitivity of a dual cloud atom interferometer to measurement vertical gravity gradient. study influence most relevant experimental parameters on noise and long term drifts. Results are also applied case doubly differential measurements gravitational signal from local source masses. achieve short-term $3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ g/$\sqrt{\text{Hz}}$ acceleration, limited by quantum projection instrument. Active control critical allows us reach...
The Einstein equivalence principle (EEP) has a central role in the understanding of gravity and space-time. In its weak form, or (WEP), it directly implies between inertial gravitational mass. Verifying this regime where relevant properties test body must be described by quantum theory profound implications. Here we report on novel WEP for atoms: Bragg atom interferometer gradiometer configuration compares free fall rubidium atoms prepared two hyperfine states their coherent superposition....
We report on the observation of Bloch oscillations unprecedented time scale several seconds. The experiment is carried out with ultracold bosonic $^{88}\mathrm{Sr}$ atoms loaded into a vertical optical standing wave. negligible atom-atom elastic cross section and zero angular momentum in ground state makes an almost ideal Bose gas, insensitive to typical mechanisms decoherence due thermalization external stray fields. small size system enables precision measurements forces at micrometer...
We present a new measurement of the Newtonian gravitational constant G based on cold-atom interferometry. Freely falling samples laser-cooled rubidium atoms are used in gravity gradiometer to probe field generated by nearby source masses. In addition its potential sensitivity, this method is intriguing as explored quantum system. report value = 6.667 x 10(-11) m(3) kg(-1) s(-2), estimating statistical uncertainty +/-0.011 s(-2) and systematic +/-0.003 s(-2). The long-term stability...
We report on a high precision measurement of gravitational acceleration using ultracold strontium atoms trapped in vertical optical lattice. Using amplitude modulation the lattice intensity, an uncertainty $\Delta g /g \approx 10^{-7}$ was reached by measuring at 5$^{th}$ harmonic Bloch oscillation frequency. After careful analysis systematic effects, value obtained with this microscopic quantum system is consistent one we measured classical absolute gravimeter same location. This result...
We present the first direct measurement of gravity-field curvature based on three conjugated atom interferometers. Three atomic clouds launched in vertical direction are simultaneously interrogated by same interferometry sequence and used to probe gravity field at equally spaced positions. The component generated nearby source masses is measured from difference between adjacent gradient values. Curvature measurements interest geodesy studies for validation gravitational models surrounding...
We report on the realization of a matter-wave interferometer based single-photon interaction ultranarrow optical clock transition strontium atoms. experimentally demonstrate its operation as gravimeter and gravity gradiometer. No reduction interferometric contrast was observed for total time up to ∼10 ms, limited by geometric constraints apparatus. Single-photon interferometers represent new class high-precision sensors that could be used detection gravitational waves in so far unexplored...
Do the laws of quantum physics still hold for macroscopic objects - this is at heart Schrödinger's cat paradox or do gravitation yet unknown effects set a limit massive particles? What fundamental relation between and gravity? Ground-based experiments addressing these questions may soon face limitations due to limited free-fall times quality vacuum microgravity. The proposed mission Macroscopic Quantum Resonators (MAQRO) overcome allow such questions. MAQRO harnesses recent developments in...
The Einstein Gravity Explorer mission (EGE) is devoted to a precise measurement of the properties space-time using atomic clocks. It tests one most fundamental predictions Einstein's Theory General Relativity, gravitational redshift, and thereby searches for hints quantum effects in gravity, exploring important challenging frontiers physics. primary goal redshift with an accuracy up factor 104 higher than best current result. based on satellite carrying cold atom-based payload includes...
Atomic wave packets loaded into a phase-modulated vertical optical-lattice potential exhibit coherent delocalization dynamics arising from intraband transitions among Wannier-Stark levels. are here observed by monitoring the in situ wave-packet extent. By varying modulation frequency, we find resonances at integer multiples of Bloch frequency. The show Fourier-limited width for interrogation times up to 2 s. This can also be used determine gravity acceleration with ppm resolution.
Atom interferometers have been shown to be very stable and accurate sensors for acceleration rotation.In this paper we review the applications of atom interferometry gravity measurements, with a special emphasis on potential impact these techniques applied science fields.
Gravity gradients represent a major obstacle in high-precision measurements by atom interferometry. Controlling their effects to the required stability and accuracy imposes very stringent requirements on relative positioning of freely falling atomic clouds, as case precise tests Einstein's equivalence principle. We demonstrate new method exactly compensate introduced gravity Raman-pulse interferometer. By shifting frequency Raman lasers during central π pulse, it is possible cancel initial...