A5068367272- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Neural Networks and Reservoir Computing
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Quantum Computing Algorithms and Architecture
- Advanced Thermodynamics and Statistical Mechanics
- Near-Field Optical Microscopy
- Optical Network Technologies
- Semiconductor Quantum Structures and Devices
- Computational Drug Discovery Methods
- Mechanical and Optical Resonators
- Gene Regulatory Network Analysis
- Plasmonic and Surface Plasmon Research
- Advanced Fluorescence Microscopy Techniques
- Statistical Mechanics and Entropy
Sapienza University of Rome
2021-2025
Abstract Entanglement-based quantum key distribution can enable secure communication in trusted node-free networks and over long distances. Although implementations exist both fiber free space, the latter approach is often considered challenging due to environmental factors. Here, we implement a protocol during daytime for first time using dot source. This technology presents advantages terms of narrower spectral bandwidth—beneficial filtering out sunlight—and negligible multiphoton emission...
Engineering single-photon states endowed with orbital angular momentum (OAM) is a powerful tool for quantum information photonic implementations. Indeed, due to its unbounded nature, OAM suitable encoding qudits, allowing single carrier transport large amount of information. Most the experimental platforms employ spontaneous parametric down-conversion processes generate photons, even if this approach intrinsically probabilistic, leading scalability issues an increasing number qudits....
The implementation of large-scale universal quantum computation represents a challenging and ambitious task on the road to processing information. In recent years, an intermediate approach has been pursued demonstrate computational advantage via non-universal models. A relevant example for photonic platforms provided by Boson Sampling paradigm its variants, which are known be computationally hard while requiring at same time only manipulation generated resources linear optics detection....
Randomness certification is a foundational and practical aspect of quantum information science, essential for securing communication protocols. Traditionally, these protocols have been implemented validated with single entanglement source, as in the paradigmatic Bell scenario. However, advancing to support more complex configurations involving multiple sources key building robust architectures realizing large-scale networks. In this work, we show how certify randomness an...
The violation of a Bell inequality is the paradigmatic example device-independent quantum information: nonclassicality data certified without knowledge functioning devices. In practice, however, all experiments rely on precise understanding underlying physical mechanisms. Given that, it natural to ask: Can one witness nonclassical behavior in truly black-box scenario? Here, we propose and implement, computationally experimentally, solution this ab initio task. It exploits robust automated...
Abstract In a Bell experiment, it is natural to seek causal account of correlations wherein only common cause acts on the outcomes. For this structure, inequality violations can be explained if dependencies are modeled as intrinsically quantum. There also exists vast landscape structures beyond that witness nonclassicality, in some cases without even requiring free external inputs. Here, we undertake photonic experiment realizing one such example: triangle network, consisting three...
Abstract Single-photon sources based on semiconductor quantum dots find several applications in information processing due to their high single-photon indistinguishability, on-demand generation, and low multiphoton emission. In this context, the generation of entangled photons represents a challenging task with possible solution relying interference probabilistic gates identical emitted at different pulses from
the same source. work, we implement approach via simple compact design...
A Bernoulli factory is a randomness manipulation routine that takes as input random variable, outputting another variable whose bias function of the bias. Recently proposed quantum-to-quantum schemes encode both and output variables in qubit amplitudes. This primitive could be used sub-routine for more complex quantum algorithms involving Bayesian inference Monte Carlo methods. Here, we report an experimental implementation polarization-encoded photonic factory. We present test three...
Analyzing the geometry of correlation sets constrained by general causal structures is paramount importance for foundational and quantum technology research. Addressing this task generally challenging, prompting development diverse theoretical techniques distinct scenarios. Recently, novel hybrid scenarios combining different assumptions within parts structure have emerged. In work, we extend a graph technique to explore classical, quantum, no-signaling distributions in scenarios, where...
Multiphoton indistinguishability is a central resource for quantum enhancement in sensing and computation. Developing certifying large scale photonic devices requires reliable accurate characterization of this resource, preferably using methods that are robust against experimental errors. Here, we propose set the multiphoton indistinguishability, based on measurements bunching photon number variance. Our semi-device independent way, sense being effective even when interferometers incorrectly...
A seminal task in quantum information theory is to realize a device able produce copies of generic input state with the highest possible output fidelity, thus realizing an \textit{optimal} cloning machine. Recently, concept variational was introduced: machine learning algorithm through which, by exploiting classical feedback loop informed processing unit, system can self-learn programming required for optimal strategy. In this work, we experimentally implement $1 \rightarrow 2$ dual-rail...
In the current era of noisy intermediate-scale quantum computers, variational algorithms represent one most viable approaches for their application to solve tasks interest. These train a parameterized circuit execute specific task encoded in cost function that needs be minimized using classical optimizer. this context, photonic platforms based on reconfigurable integrated optics appear as prominent implementation algorithms. circuital model computation qubits, circuits, parameter shift rule...
Bosonic bunching is a term used to describe the well-known tendency of bosons bunch together, and which differentiates their behaviour from that fermions or classical particles. However, in some situations perfectly indistinguishable may counter-intuitively less than classical, distinguishable Here we report two such counter-intuitive multiphoton effects observed with three photons three-mode balanced photonic Fourier interferometer. In this setting, show actually minimize probability...
Abstract Quantum state teleportation represents a pillar of quantum information and milestone on the roadmap towards networks with large number nodes. Successful photonic demonstrations this protocol have been carried out employing different qubit encodings. However, in Fock basis encoding are challenging, due to impossibility generating coherent superposition vacuum-one photon states single mode linear optics. Indeed, previous realizations only allowed dual-rail entangled states, by...
Quantum Darwinism offers an explanation for the emergence of classical objective features (those we are used to at macroscopic scales) from quantum properties microscopic level. The interaction a system with its surroundings redundantly proliferates information many parts environment, turning it accessible and different observers. However, given that one cannot probe directly, only how determine whether unknown property can be deemed objective? Here propose probabilistic framework analyze...
Quantum state teleportation represents a pillar of quantum information and milestone on the roadmap towards networks with large number nodes. Successful photonic demonstrations this protocol have been carried out employing different qubit encodings. However, in Fock basis encoding are challenging, due to impossibility creating coherent superposition vacuum-one photon states single mode linear optics. Previous realizations using such an strongly relied ancillary modes electromagnetic field,...
The violation of a Bell inequality is the paradigmatic example device-independent quantum information: nonclassicality data certified without knowledge functioning devices. In practice, however, all experiments rely on precise understanding underlying physical mechanisms. Given that, it natural to ask: Can one witness nonclassical behaviour in truly black-box scenario? Here we propose and implement, computationally experimentally, solution this ab-initio task. It exploits robust automated...
The on-demand generation of orbital angular momentum entangled states is a pivotal task in quantum information. Here, we investigated it both the inter- and intraparticle regime producing single photons via dot source.
We used a black-box approach in quantum information protocols. This allows us to optimize an engineering protocol compensating for experimental imperfections and the nonclassicality of unknown system reinforcing device-independent paradigm.
We implement triangle causal structures in photonics platforms and detect different forms of nonlocality. In particular, we focused on the Genuine Multipartite Non-locality nonlocality exhibited a network without freedom choice.
Single-photon sources based on semiconductor quantum dots find several applications in information processing due to their high single-photon indistinguishability, on-demand generation, and low multiphoton emission. In this context, the generation of entangled photons represents a challenging task with possible solution relying interference probabilistic gates identical emitted at different pulses from same source. work, we implement approach via simple compact design that generates photon...
Quantum key distribution (QKD) is at the heart of future secure quantum communication networks as it can enhance security classical strategies. Although prepare-and-measure protocols are most widely used in practical applications, entangled-based QKD promising for further improving degree and developing free-trusted node networks. However, free-space link implementations single photon transmission suffer daylight operations few works have been demonstrated this regime. Furthermore, air has...
Entanglement-based quantum key distribution can enable secure communication in trusted node-free networks and over long distances. Although implementations exist both fiber free space, the latter approach is often considered challenging due to environmental factors. Here, we implement a protocol during daytime for first time using dot source. This technology presents advantages terms of narrower spectral bandwidth -- beneficial filtering out sunlight negligible multiphoton emission at peak...
In a Bell experiment, it is natural to seek causal account of correlations wherein only common cause acts on the outcomes. For this structure, inequality violations can be explained if dependencies are modelled as intrinsically quantum. There also exists vast landscape structures beyond that witness nonclassicality, in some cases without even requiring free external inputs. Here, we undertake photonic experiment realizing one such example: triangle network, consisting three measurement...
Engineering single-photon states endowed with Orbital Angular Momentum (OAM) is a powerful tool for quantum information photonic implementations. Indeed, thanks to its unbounded nature, OAM suitable encode qudits allowing single carrier transport large amount of information. Nowadays, most the experimental platforms use nonlinear crystals generate photons through Spontaneous Parametric Down Conversion processes, even if this kind approach intrinsically probabilistic leading scalability...