Various ways to modify the absorption and emission rates of atoms or molecules have been sought in the field of quantum optics for applications such as metrology, light energy harvesting and quantum information processing.
A promising approach is based on the correlated decay of emitters (Dicke’s superradiance), which can also take place in large atomic samples, including through the...
We present an experiment regarding the CHSH inequality violation by single photons, thus concerning the failure of contextuality instead of locality in quantum physics. Single photons are generated by different sources (Laser, led and a halogen lamp). This experiment proves that it is possible to continuously pass from a quantum description of CHSH inequality violation, where violation...
Recently, single-photon states have been extensively employed as information carriers in several quantum information protocols. In this framework multiphoton interference plays a crucial role for the hardness of simulating bosons statistics, thus preventing a direct verification of multiphoton experiments. The latest results on Boson Sampling make available multiphoton states up to 20 photons....
Superconducting circuits are emerging as leading candidates for qubits as they offer fast gate times and high fidelity, and because of their simple design and fabrication. The current limit of superconducting circuits is their poor coherence time. This value, today on the order of hundreds of μs, should be improved to a few milliseconds for an efficient quantum processor.
The DEMETRA project,...
The 3 MV Tandetron accelerator beamline at LABEC (Florence) has been upgraded to ion implantation experiments for fabrication of single-photon emitters. Silicon ions have been implanted in single- and poly-crystalline diamond matrices, in the 0-2.4 $\mu$m range of depths (0.2-11 MeV energy), down to the diffraction limit of lateral resolution, over a fluence range of $10^{7}-10^{15}$...
Nitrogen-vacancy (NV)-doped nanodiamonds (NDs) have applications in quantum-sensing of temperature and magnetic fields. We succeded in ns laser-synthesis,from graphite, of fluorescent NV-NDs w/o any post-process activation as opposed to current production techniques. Proof of NDs formation is given by SAED, SEM and Raman spectroscopy. NV centers are probed by spectrally-resolved Optically...
In recent years semiconductor nanowires (NWs) for quantum technologies have been raising great interest, due to the development of quantum devices and detectors. Among them InAs and InAs-GaSb core shell NWs are of special interest as they are shown to be suitable as sensors, with applications in domains as detectors of radiation [1,2] and of chemical species [3], and can readily be fabricated...
Atomic gravimeters are the most precise absolute gravity sensors. A main feature of atom interferometers is the ability to perform differential measurements, in gradiometric configuration, with almost perfect suppression of vibration noise. So far this has been achieved on baselines of the order of the meter. By combining optical metrology and atom optics methods, the OLAGS program will...
The standard model of quantum computation aims to approximate an arbitrary unitary transformation using a universal set of quantum gates. While this approach has the advantage to detach the development of algorithms from a specific hardware implementation, it might still be quite impractical in the NISQ technology era. The Quantum Coherent Device group at LLNL is developing a quantum computing...
Silicon-photonic design capability is useful in implementing quantum communication apparata, where light-based data transfer is envisioned, or for quantum key distribution in quantum cryptography.
To this aim, PHOS4BRAIN is a project funded by INFN CSN5 to design and operate high-speed radiation hard links using Photonic Integrated circuits (PIC): custom-designed Mach-Zehnder Modulators...
We illustrate the application of Quantum Computing techniques to the investigation of the thermodynamical properties of a simple system, made up of three
quantum spins with frustrated pair interactions and affected by a hard sign problem
when treated within classical computational schemes.
We show how quantum algorithms completely solve the problem, and discuss how
this can apply to more...
We are forming a network of labs under the QUITPA (Quantum Information Transfer in Positronium Annihilation) acronym, to study quantum information transfer in positronium (Ps: bound state e+ e-) decay.
The pioneering study of correlation between the quantum numbers of Ps and theory-predicted entanglement of the polarization of its annihilation γs will be performed.
Present groups:
-Antimatter,...
The methods currently used and the results achieved in Virgo for the reduction of the quantum shot noise through the use of frequency-independent squeezed light sources will be reviewed. In the second part of the presentation it will be described the ongoing R&D activity aimed for the realization of a frequency dependent squeezed light source for Advanced Virgo Plus. The use of this source...
The trend in particle physics experiment is to move the off-line analysis to real-time analysis and even to first-level trigger. The most powerful approach would be an hardware implement of machine learning techniques. Nowadays, this goal is limited by the computing power, power consumption and processing speed of traditional computing elements.
A novel approach is to use a neural network...
New technologies and skills are needed to face future challenges of fundamental physics, ranging from understanding the nature of Dark Matter to fundamental problems of Quantum Field Theory. The low-mass frontier of Dark Matter, the measurement of the neutrino mass, the search for new light bosons in laboratory experiments, all require detectors sensitive to excitations of meV or smaller. The...
The idea of using a quantum system to simulate another quantum system was proposed by R.P Feynman at the beginning of 80's. Since then many theoretical and experimental discoveries (e.g. Shor's algorithm, KLM scheme) followed, giving the birth to quantum information processing science.
Photons are one of the preferred vehicles to implement quantum logic gates and many examples of discrete...
