A5012928316- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Quantum optics and atomic interactions
- Orbital Angular Momentum in Optics
- Optical Network Technologies
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Optical Wireless Communication Technologies
- Mechanical and Optical Resonators
- Asthma and respiratory diseases
- Respiratory and Cough-Related Research
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Chaos-based Image/Signal Encryption
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Photonic Communication Systems
- Diverticular Disease and Complications
- Pediatric Hepatobiliary Diseases and Treatments
- Cosmology and Gravitation Theories
- Inflammatory Bowel Disease
- Colorectal and Anal Carcinomas
- Near-Field Optical Microscopy
- Allergic Rhinitis and Sensitization
University of Padua
2016-2025
Istituto Nazionale di Fisica Nucleare
2018-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2020-2024
Istituto di Fotonica e Nanotecnologie
2016-2021
Harvey Mudd College
2021
Jet Propulsion Laboratory
2021
University of Molise
2020-2021
University of Naples Federico II
1998-2020
Sorbonne Université
2019
Laboratoire de Recherche en Informatique de Paris 6
2019
Quantum cryptography is arguably the fastest growing area in quantum information science. Novel theoretical protocols are designed on a regular basis, security proofs constantly improving, and experiments gradually moving from proof-of-principle lab demonstrations to in-field implementations technological prototypes. In this review, we provide both general introduction state of art description recent advances field, theoretically experimentally. We start by reviewing key distribution based...
Quantum walk represents one of the most promising resources for simulation physical quantum systems, and has also emerged as an alternative to standard circuit model computing. Here we investigate how particle statistics, either bosonic or fermionic, influences a two-particle discrete walk. Such experiment been realized by exploiting polarization entanglement simulate bunching-antibunching feature noninteracting bosons fermions. To this scope novel three-dimensional geometry waveguide is...
Twisted photons are carrying a well-defined nonzero value of orbital angular momentum (OAM). The associated optical wave exhibits helical shape the wavefront (hence name) and an vortex at beam axis. OAM light is attracting growing interest for its potential in photonic applications ranging from particle manipulation, microscopy nanotechnologies, to fundamental tests quantum mechanics, classical data multiplexing communication. Hitherto, however, all results obtained with were limited...
The ability to manipulate quantum states of light by integrated devices may open new perspectives both for fundamental tests mechanics and novel technological applications. However, the technology handling polarization-encoded qubits, most commonly adopted approach, is still missing in optical circuits. Here we demonstrate first photonic controlled-NOT (CNOT) gate qubits. This result has been enabled integration, based on femtosecond laser waveguide writing, partially polarizing beam...
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...
Abstract Establishing secure communication links at a global scale is major potential application of quantum information science but also extremely challenging for the underlying technology. Although milestone experiments using satellite-to-ground and exploiting singe-photon encoding implementing key distribution have shown recently that this goal achievable, it still necessary to further investigate practical solutions compatible with classical optical systems. Here, we examine feasibility...
The emerging strategy to overcome the limitations of bulk quantum optics consists taking advantage robustness and compactness achievable by integrated waveguide technology. Here we report realization a directional coupler, fabricated femtosecond laser writing, acting as an beam splitter able support polarization-encoded qubits. This maskless single step technique allows us realize circular transverse profiles which are propagation Gaussian modes with any polarization state. Using this...
We studied the effects of reduced allergen exposure on bronchial hypereactivity (BHR) in two groups asthmatic children allergic to house dust mites (HDM) living at high altitude for 9 continuous mo. In first group serum levels total and HDM-specific IgE showed significant decreases after 3 mo (p < 0.001 p 0.02, respectively) 0.001). Three months returning home had increased significantly The mean percentage fall peak expiratory flow exercise testing improved 0.05), but it deteriorated 0.01)....
A complete and deterministic Bell state measurement was realized by a simple linear optics experimental scheme which adopts two-photon polarization-momentum hyperentanglement. The scheme, is based on the discrimination among single photon states of hyperentangled state, requires adoption standard detectors. four polarization have been measured with average fidelity $F=0.889\ifmmode\pm\else\textpm\fi{}0.010$ using momentum degree freedom as ancilla. feasibility has characterized function...
We present an efficient method to extract the amount of true randomness that can be obtained by a Quantum Random Number Generator (QRNG). By repeating measurements quantum system and swapping between two mutually unbiased bases, lower bound achievable evaluated. The is thanks uncertainty principle complementary applied min- max- entropies. tested our with different QRNGs, using train qubits or ququart, demonstrating scalability toward practical applications.
A six-qubit hyperentangled state has been realized by entangling two photons in three degrees of freedom. These correspond to the polarization, longitudinal momentum, and indistinguishable emission produced a two-crystal system operating with type I phase matching spontaneous parametric down conversion regime. The characterized chained interferometric apparatus its complete entangled nature tested witness criterion specifically presented for states. experiment represents realization genuine...
Secure random numbers are a fundamental element of many applications in science, statistics, cryptography and more general security protocols. We present method that enables the generation high-speed unpredictable from quadratures an electromagnetic field without any assumption on input state. The allows us to eliminate can be predicted due presence classical quantum side information. In particular, we introduce procedure estimate bound conditional min-entropy based entropic uncertainty...
Random numbers are commonly used in many different fields, ranging from simulations fundamental science to security applications. In some critical cases, as Bell's tests and cryptography, the random required be both secure (i.e. known only by legitimate user) provided at an ultra-fast rate larger than Gbit/s). However, practical generators usually considered trusted, but their can compromised case of imperfections or malicious external actions. this work we introduce efficient protocol which...
Multiplexing is a strategy to augment the transmission capacity of communication system. It consists combining multiple signals over same data channel and it has been very successful in classical communications. However, use enhanced channels only reached limited practicality quantum communications (QC) as requires manipulation systems higher dimensions. Considerable effort being made towards QC using high-dimensional encoded into transverse momentum single photons, but so far no approach...
Weak measurements have thus far been considered instrumental in the so-called direct measurement of quantum wavefunction [Nature (London) 474, 188 (2011)]. Here we show that can be obtained by using arbitrary strength. In particular, case strong measurements, i.e. those which coupling between system and measuring apparatus is maximum, compared precision accuracy two methods, showing outperform weak both for states most cases. We also give exact expression difference reconstructed original...
Quantum Key Distribution (QKD) relies on quantum communication to allow distant parties share a secure cryptographic key. Widespread adoption of QKD in current telecommunication networks will require the development simple, low cost and stable systems. However, implementations usually include additional hardware that perform auxiliary tasks such as temporal synchronization polarization basis tracking. Here we present polarization-based system operating at 1550 nm performs compensation by...
We report on the experimental realization of a four-qubit linear cluster state via two photons entangled both in polarization and momentum. This was investigated by performing tomographic measurements evaluating an entanglement witness. By use this we carried out novel nonlocality proof, so-called ``stronger observer all-versus-nothing'' test quantum nonlocality.
We present a novel optical device based on an integrated system of microlenses and single-mode fibers. It allows us to collect direct into many modes two photons generated by spontaneous parametric down-conversion. By this multiqubit entangled states and/or multilevel qudit photons, encoded in the longitudinal momentum degree freedom, are created. The multipath photon entanglement realized is expected find important applications modern quantum information technology.
We create a six-qubit linear cluster state by transforming two-photon hyperentangled in which three qubits are encoded each particle, one the polarization and two momentum degrees of freedom. For this state, we demonstrate genuine entanglement, persistency entanglement against loss qubits, higher violation than previous experiments on Bell inequalities Mermin type.
The emerging strategy to overcome the limitations of bulk quantum optics consists taking advantage robustness and compactness achievable by integrated waveguide technology. Here we report realization a directional coupler, fabricated femtosecond laser writing, acting as an beam splitter able support polarization encoded qubits. This maskless single step technique allows realize circular transverse profiles propagation Gaussian modes with any state. Using this device, demonstrate interference...
The study of the free-space distribution quantum correlations is necessary for any future application and classical communication aiming to connect two remote locations. Here we propagation a coherent laser beam over 143 km (between Tenerife La Palma Islands Canary archipelagos). By attenuating also studied at single photon level. We investigated statistic arrival incoming photons scintillation beam. From analysis data, propose exploitation turbulence improve signal noise ratio signal.
Gastrointestinal tract perforations can occur for various causes such as peptic ulcer, inflammatory disease, blunt or penetrating trauma, iatrogenic factors, foreign body a neoplasm that require an early recognition and, often, surgical treatment.Ultrasonography could be useful initial diagnostic test to determine, in cases the presence sometimes, cause of pneumoperitoneum.The main sonographic sign perforation is free intraperitoneal air, resulting increased echogenicity peritoneal stripe...
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...