A5002391489- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Quantum Mechanics and Applications
- Photonic and Optical Devices
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Laser-Matter Interactions and Applications
- Neural Networks and Reservoir Computing
- Photonic Crystals and Applications
- Quantum and electron transport phenomena
- Molecular Junctions and Nanostructures
- Nonlinear Optical Materials Studies
- Optical Network Technologies
- Distributed systems and fault tolerance
- Spectroscopy and Quantum Chemical Studies
- Photorefractive and Nonlinear Optics
- Advanced Optical Sensing Technologies
- Advanced Fiber Laser Technologies
- Analytical Chemistry and Sensors
- Photochemistry and Electron Transfer Studies
- Plasmonic and Surface Plasmon Research
- Photoacoustic and Ultrasonic Imaging
- Organic Light-Emitting Diodes Research
Alessandro Manzoni Hospital
2023-2025
Aziende Socio Sanitarie Territoriali di Lecco
2023-2025
Institute of Photonic Sciences
2020-2024
University of Colorado Anschutz Medical Campus
2023
Imperial College London
2014-2021
University of York
2019
National Institute of Optics
2014-2015
University of Florence
2015
University of Milan
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2015
Quantum teleportation is an essential capability for quantum networks, allowing the transmission of bits (qubits) without a direct exchange information. Its implementation between distant parties requires information to matter qubits that store it long enough allow users perform further processing. Here we demonstrate distance from photonic qubit at telecom wavelength qubit, stored as collective excitation in solid-state memory. Our system encompasses active feed-forward scheme, implementing...
Entanglement between photons at telecommunication wavelengths and long-lived quantum memories is one of the fundamental requirements long-distance communication. Quantum featuring on-demand readout multimode operation are additional precious assets that will benefit communication rate. In this Letter, we report first demonstration entanglement a telecom photon collective spin excitation in solid-state memory. Photon pairs generated through widely nondegenerate parametric down-conversion,...
Ensemble-based quantum memories are key to developing multiplexed repeaters, able overcome the intrinsic rate limitation imposed by finite communication times over long distances. Rare-earth ion doped crystals main candidates for highly multimode memories, where time, frequency and spatial multiplexing can be exploited store multiple modes. In this context atomic comb (AFC) memory provides large temporal capacity, which readily combined with in space. article, we derive theoretical formulas...
The deployment of a full-fledged quantum internet poses the challenge finding adequate building blocks for entanglement distribution between remote nodes. A practical system would combine propagation in optical fibers with memories light, leveraging on existing communication network while featuring scalability required to extend sizes. Here, we demonstrate fiber-integrated memory entangled photon at telecommunication wavelength. storage device is based fiber-pigtailed laser-written waveguide...
Many quantum information protocols require the storage and manipulation of over long times, its exchange between nodes a network across distances. Implementing these requires an advanced hardware, featuring, for example, register long-lived interacting qubits with efficient optical interface in telecommunication band. Here we present Purcell-enhanced detection single solid-state ions erbium-doped nanoparticles placed fiber cavity, emitting photons at 1536 nm. The open-access design cavity...
The ability to distribute heralded entanglement between distant matter nodes is a primitive for the implementation of large-scale quantum networks. Some most crucial requirements future applications include high heralding rates at telecom wavelengths, multiplexed operation and on-demand retrieval stored excitations synchronization separate links. Despite tremendous progress in various physical systems, demonstration telecom-heralded featuring both remains elusive. In this work, we combine...
Single organic molecules offer great promise as bright, reliable sources of identical single photons on demand, capable integration into solid-state devices.It has been proposed that such in a crystalline matrix might be placed close to an optical waveguide for this purpose, but so far there have no demonstrations sufficiently thin crystals, with controlled concentration suitable dopant molecules.Here we present method growing very anthracene crystals from supersaturated vapour, which...
We suggest and demonstrate a tomographic method to characterise homodyne detectors at the quantum level. The positive operator measure associated with detector is expanded in quadrature basis probed set of coherent states. coefficients expansion are then retrieved using least squares algorithm. Our model general enough describe different implementations setup, it has proven capable effectively describing response sets. validate reconstructed on nonclassical states exploit results estimate...
ERAS pathway has been proposed as the standard of care in elective abdominal surgery. Guidelines on emergency surgery have recently published; however, few evidences are still available literature. The aim this study was to evaluate feasibility an enhanced recovery protocol a large cohort patients undergoing and identify possible factors impacting postoperative compliance.This is prospective multicenter observational including who underwent major general for either intra-abdominal infection...
We propose a definition of nonclassicality for single-mode quantum-optical process based on its action coherent states. If quantum transforms state to nonclassical state, it is verified be nonclassical. To identify processes, we introduce representation called the process-nonclassicality quasiprobability distribution, whose negativities indicate process. Using this derive relation predicting output states given input state. experimentally demonstrate our method by considering single-photon...
The longitudinal ($\Gamma_1$) and transverse ($\Gamma_2$) decay rates of a two-level quantum system have profound influence on its evolution. Atomic systems with $\Gamma_2=\tfrac{1}{2}\Gamma_1$ been studied extensively, but the rise solid-state devices it is also important to consider effect stronger relaxation due interactions solid environment. Here we study dynamics single organic dye molecule driven by laser. We measure variation $\Gamma_2$ temperature determine activation energy for...
We demonstrate the emission of photons from a single molecule into hybrid gap plasmon waveguide (HGPW). Crystals anthracene, doped with dibenzoterrylene (DBT), are grown on top waveguides. investigate DBT coupled to plasmonic region one guides, and determine its in-plane orientation, excited state lifetime saturation intensity. The emits light guide, which is remotely out-coupled by grating. second-order auto-correlation cross-correlation functions show that emitter emerging grating comes...
We report on the transmission of telecom photons entangled with a multimode solid-state quantum memory over deployed optical fiber in metropolitan area. Photon pairs were generated through spontaneous parametric downconversion, one photon stored rare-earth-based memory, and other, at telecommunication wavelengths, traveling increasing distances fiber, first laboratory then outside loop. measured highly non-classical correlations between for storage times up to 25 µs separation 50 km. also...
Dibenzoterrylene (DBT) molecules within a crystalline anthracene matrix show promise as quantum emitters for controlled, single photon production. We present the design and construction of chamber in which we reproducibly grow doped crystals optical quality that are several mm across few μm thick. demonstrate control DBT concentration over range 6–300 parts per trillion these stable single-photon emitters. interpret our data with simple model provides some information on vapour pressure DBT.
We discuss some of the main features a recently-generated form hybrid entanglement between discrete- and continuous-variable states light. Ideally, such kind should involve single-photon coherent as key representatives respective categories states. Here we investigate characteristics limits scheme that, relying on superposition photon-creation operators onto two distinct modes, realizes above ideal in an approximate way.
It has recently been theoretically shown that Quantum Memories (QM) could enable truly global quantum networking when deployed in space thereby surpassing the limited range of land-based repeaters. Furthermore, QM novel protocols and long-range entanglement teleportation applications suitable for Deep-Space links extended scenarios fundamental physics tests. In this white paper we will make case importance deploying QMs to space, also discuss major technical milestones development stages...
A reliable single photon source is required for many aspects of quantum technology. Organic molecules are attractive this application because they can have high yield and be photostable, even at room temperature. To generate a with probability, laser must excite the molecule efficiently. We develop simple model that efficiency discuss how to optimise it. demonstrate validity our through experiments on dibenzoterrylene (DBT) in an anthracene crystal. show excitation probability cannot exceed...
The realization of hybrid entanglement between a microscopic (quantum) and macroscopic (classical) system, in analogy to the situation famous Schrödinger's cat paradox, is an important milestone, both from fundamental perspective for possible applications processing quantum information. most straightforward optical implementation this condition that single-photon coherent state. In work, we describe first step towards generation type experimental perspective.
We propose and demonstrate pump-probe spectroscopy of rubidium absorption that reveals the sub-Doppler hyperfine structure ${}^{5}{\mathrm{S}}_{1/2}\ensuremath{\leftrightarrow}{}^{5}{\mathrm{P}}_{3/2}$ (${\mathrm{D}}_{2}$) transitions. The counterpropagating pump probe lasers are independently tunable in frequency, with operating at single-photon level. two-dimensional spectrum measured as laser frequencies scanned shows fluorescence, Doppler-broadened dips, features. detuning between allows...
Integrated photonics offers compact and stable manipulation of optical signals in miniaturized chips, with the possibility changing dynamically their functionality by means integrated phase shifters. Cryogenic operation these devices is becoming essential for advancing photonic quantum technologies, accommodating components like light sources, single photon detectors memories operating at liquid helium temperatures. In this work, we report on a programmable glass circuit (PIC) fabricated...
We report our progress towards the demonstration of telecom-heralded matter-matter entanglement between solid-state, on-demand and remote quantum memories based on rare-earth—doped crystals.