A5014593158- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Quantum Mechanics and Applications
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Quantum Computing Algorithms and Architecture
- Advanced Fiber Laser Technologies
- Force Microscopy Techniques and Applications
- Neural Networks and Reservoir Computing
- Random lasers and scattering media
- Advanced MEMS and NEMS Technologies
- Laser-Matter Interactions and Applications
- Orbital Angular Momentum in Optics
- Photonic Crystals and Applications
- Optical Network Technologies
- Quantum Electrodynamics and Casimir Effect
- Optical Coherence Tomography Applications
- Advanced Fluorescence Microscopy Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Photorefractive and Nonlinear Optics
- Biofield Effects and Biophysics
- Analytical Chemistry and Sensors
- Noncommutative and Quantum Gravity Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Optical Sensing Technologies
Università di Camerino
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2016-2025
University of Central Florida
2010-2017
Istituto Nazionale di Fisica Nucleare
1996-2017
ITER
2015-2017
Photonics (United States)
2010
Boston University
2002-2004
Istituto Nazionale per la Fisica della Materia
1997-2002
Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics
2002
Ferrari (Italy)
2002
We demonstrate the analogue of electromagnetically induced transparency in a room temperature cavity optomechanics setup formed by thin semitransparent membrane within Fabry-P\'erot cavity. Due to destructive interference, weak probe field is completely reflected when pump beam resonant with motional red sideband Under this condition we infer significant slowing down light hundreds microseconds, which easily tuned shifting along axis. also observe associated phenomenon amplification occurs...
We report on the observation of Anderson wave localization in one-dimensional waveguide arrays with off-diagonal disorder. The elements are inscribed silica glass, and a uniform random distribution coupling parameters is achieved by precise variation relative positions. In absence disorder we observe ballistic transport as expected from discrete diffraction periodic arrays. When deliberately introduced into array localization. strength signature increases higher levels
Abstract A minimal observable length is a common feature of theories that aim to merge quantum physics and gravity. Quantum mechanically, this concept associated with nonzero uncertainty in position measurements, which encoded deformed commutation relations. In spite increasing theoretical interest, the subject suffers from complete lack dedicated experiments bounds deformation parameters have just been extrapolated indirect measurements. As recently proposed, low-energy mechanical...
We propose a scheme for the generation of robust stationary squeezed state mechanical resonator in quadratically coupled optomechanical system, driven by pulsed laser. The intracavity photon number presents periodic intense peaks suddenly stiffening effective harmonic potential felt resonator. These ``optical spring kicks'' tend to squeeze position, and due interplay with fluctuation-dissipation processes one can generate more than 10 dB squeezing realistic scenario, even starting from...
The active microcavity is adopted as an efficient source of nonclassical light. Using this device, excited with a mode-locked laser at rate 100 MHz, single photons are generated over field mode sub-Poissonian distribution. Adiabatic recycling within multistep Franck-Condon molecular optical-pumping mechanism, characterized by quantum efficiency close to 1, implies pump self-regularization process leading striking $n$-squeezing effect. Replicating the basic single-atom excitation beam photon...
We realize a phase-sensitive closed-loop control scheme to engineer the fluctuations of pump field which drives an optomechanical system and show that corresponding cooling dynamics can be significantly improved. In particular, operating in counterintuitive "antisquashing" regime positive feedback increased fluctuations, sideband nanomechanical membrane within optical cavity improved by 7.5 dB with respect case without feedback. Close quantum reduced thermal noise, such feedback-controlled...
We demonstrate quantum walks of a photon pair in spatially extended Einstein-Podolsky-Rosen state coupled into an on-chip multiport photonic lattice. By varying the degree entanglement we observe Anderson localization for pairs separable and colocalization entangled state. In former case, each localizes independently, while latter neither localizes, but colocalizes--revealing unexpected survival spatial correlations through strong disorder.
Abstract The information-carrying capacity of a single photon can be vastly expanded by exploiting its multiple degrees freedom: spatial, temporal, and polarization. Although qubits encoded per photon, to date only two-qubit single-photon quantum operations have been realized. Here, we report an experimental demonstration three-qubit single-photon, linear, deterministic gates that exploit polarization the two-dimensional spatial-parity-symmetry transverse field. These are implemented using...
Single-photon sources are important for integrated photonics and quantum technologies, can be used in key distribution, computing, sensing. Color centers the solid state a promising candidate development of next generation single-photon devices. They point defects crystal lattice that absorb emit light at given wavelengths single photons with high efficiency. The landscape color has changed abruptly recent years, identification wider set emergence new solid-state platforms room-temperature...
Decoherence may significantly affect the polarization state of optical pulses propagating in dispersive media because unavoidable presence more than a single frequency envelope pulse. Here we report on suppression decoherence ring cavity obtained by properly retooling for photonic qubits "bang-bang" protection technique already employed nuclear spins and nuclear-quadrupole qubits. Our results show that bang-bang control can be profitably extended to quantum information processes involving flying
Normal--mode splitting is the most evident signature of strong coupling between two interacting subsystems. It occurs when subsystems exchange energy themselves faster than they dissipate it to environment. Here we experimentally show that a weakly coupled optomechanical system at room temperature can manifest normal--mode pump field fluctuations are anti-squashed by phase-sensitive feedback loop operating close its instability threshold. Under these conditions optical cavity exhibits an...
The generation of entangled states three or more photons through the nonlinear process spontaneous parametric down-conversion requires use a femtosecond pump to provide an indistinguishability photon pairs generated from different crystals. We demonstrate experimentally that quantum interference between two in each crystals will degrade significantly as duration pulse becomes shorter than coherence time signal and idler photons. Spectral postselection using narrow-band filters compensates...
We present an experimental study of dynamical back-action cooling the fundamental vibrational mode a thin semitransparent membrane placed within high-finesse optical cavity. how radiation pressure interaction modifies mechanical response mode, and results are in agreement with Langevin equation description coupled dynamics. The experiments carried out resolved sideband regime, we have observed by factor 350 also frequency shift associated quadratic term expansion cavity versus effective...
We study the quantum dynamics of cavity optomechanical system formed by a Fabry-Perot with thin vibrating membrane at its center. first derive general multimode Hamiltonian describing radiation pressure interaction between modes and vibrational membrane. then restrict analysis to standard case single mode interacting mechanical resonator we determine what extent optical absorption hinder reaching regime for cavity-membrane system. show that does not pose serious limitations one can...
In view of the integration membrane resonators with more complex MEMS structures, we developed a general fabrication procedure for circular shape SiNx membranes using Deep Reactive Ion Etching (DRIE). Large area and high-stress were fabricated used as optomechanical in Michelson interferometer, where Q values up to 1.3 × 106 measured at cryogenic temperatures, Fabry-Pérot cavity, an optical finesse 50000 has been observed.
We study the optomechanical behaviour of a driven Fabry-P\'erot cavity containing two vibrating dielectric membranes. characterize cavity-mode frequency shift as function two-membrane positions, and report $\sim 2.47$ gain in coupling strength membrane relative motion with respect to single case. This is achieved when membranes are properly positioned form an inner which resonant driving field. also show that this system has capability tune single-photon on demand, represents promising...
We study synchronization of a room-temperature optomechanical system formed by two resonators coupled via radiation pressure to the same driven optical cavity mode. By using stochastic Langevin equations and effective slowly varying amplitude equations, we explore long-time dynamics system. see that thermal noise can induce significant non-Gaussian dynamical properties, including coexistence multistable synchronized limit cycles phase diffusion. Synchronization in this is very robust with...
The conditions required for spontaneous parametric down-conversion in a waveguide with periodic nonlinearity the presence of an unguided pump field are established. Control and physical properties permits quasiphase matching equations that describe counterpropagating guided signal idler beams to be satisfied. We compare tuning curves spectral such those copropagating under typical experimental conditions. find exhibit narrow bandwidth, permitting generation quantum states possess...
We report the results of an experiment in which postselected polarization-entangled photons were used to test recent nonlocality proof by L. Hardy [Phys. Rev. Lett. 71, 1665 (1993)]. The particular source entangled has advantage that it is very easy prepare a pair state with any degree entanglement. Hardy's theorem, only works for nonmaximally states, was tested range states.
We explore the propagation of light in a two-photon state disordered optical systems that induce Anderson localization. show entangled-photon pairs demonstrate surprising behavior we call colocalization: While neither photon exhibits localization, spatial correlations pair remain intact. Furthermore, colocalize faster than classical localizes same system. also anticorrelated and partially entangled such systems. The results are developed using linear theory extends scope quantum imaging to...
Integrated photonics on Silicon-On-Insulator (SOI) substrates is a well developed research field that has already significantly impacted various fields, such as quantum computing, micro sensing devices, biosensing, and high-rate communications. Although quite complex circuits can be made with technology, everything based few ’building blocks’ which are then combined to form more circuits. This review article provides detailed examination of the state art integrated photonic building blocks...
We describe the experimental test of a quantum key distribution performed with two-way protocol without using entanglement. An individual incoherent eavesdropping is simulated and induces variable amount noise on communication channel. This allows direct verification agreement between theory practice.