A5053830874- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Optical Wireless Communication Technologies
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Quantum optics and atomic interactions
- Molecular Communication and Nanonetworks
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Advanced Frequency and Time Standards
- Quantum and electron transport phenomena
- Lung Cancer Diagnosis and Treatment
- Geophysics and Sensor Technology
- Satellite Communication Systems
- Analog and Mixed-Signal Circuit Design
- Lung Cancer Treatments and Mutations
- Radio Frequency Integrated Circuit Design
- History and Developments in Astronomy
- Advancements in PLL and VCO Technologies
- Semiconductor Lasers and Optical Devices
- Adaptive optics and wavefront sensing
- Space Satellite Systems and Control
Sorbonne Université
2021-2024
Centre National de la Recherche Scientifique
2021-2024
Laboratoire de Recherche en Informatique de Paris 6
2023-2024
University of Padua
2016-2023
Université Paris Cité
2021-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2022-2023
Istituto Nazionale di Fisica Nucleare
2018-2022
Abstract Quantum Information Networks (QINs) attract increasing interest, as they enable connecting quantum devices over long distances, thus greatly enhancing their intrinsic computing, sensing, and security capabilities. The core mechanism of a QIN is state teleportation, consuming entanglement, which can be seen in this context new kind network resource. Here we identify use cases per activity sector, including key performance targets, reference for the requirements. We then define...
Abstract Future quantum communication infrastructures will rely on both terrestrial and space-based links integrating high-performance optical systems engineered for this purpose. In downlinks in particular, the loss budget variations signal propagation due to atmospheric turbulence effects impose a careful optimization of coupling light single-mode fibers required interfacing with receiving stations ground networks. work, we perform comprehensive study role adaptive optics (AO)...
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...
Bipartite Bell inequalities can simultaneously be violated by two different pairs of observers when weak measurements and signalling is employed. Here, we experimentally demonstrate the violation simultaneous CHSH exploiting a two-photon polarisation maximally entangled state. Our results that large double achievable. demonstration may have impact for Quantum Key Distribution or certification Random Number generators based on measurements.
Gedankenexperiments have consistently played a major role in the development of quantum theory. A paradigmatic example is Wheeler's delayed-choice experiment, wave-particle duality test that cannot be fully understood using only classical concepts. Here, we implement idea along satellite-ground interferometer which extends for thousands kilometers Space. We exploit temporal and polarization degrees freedom photons reflected by fast moving satellite equipped with retro-reflecting mirrors....
Quantum key distribution (QKD) is a prominent application in the field of quantum cryptography, providing information-theoretic security for secret exchange. The implementation QKD systems on photonic integrated circuits (PICs) can reduce size and cost such facilitate their deployment practical infrastructures. To this end, continuous-variable (CV) are particularly well-suited as they do not require single-photon detectors, whose integration presently challenging. Here we present CV-QKD...
Satellite-based quantum communication (QC) is an invaluable resource for the realization of a network at global scale. In this regard, use satellites well beyond low Earth orbit gives advantage long time with ground station. However, high-orbit pose great technological challenge due to high diffraction losses optical channel, and experimental investigation such channels still lacking. Here, we report on first exchange single photons from navigation satellite system (GNSS) slant distance 20...
Entanglement is a fundamental resource for quantum information science. However, bipartite entanglement destroyed when one particle observed via projective (sharp) measurements, as typically the case in most experiments. Here, we show experimentally that, if instead of sharp performs many sequential unsharp measurements on that are suitably chosen depending previous outcomes, then preserved and it possible to reveal correlations through second at any step sequence. Specifically, observe...
Single photon sources (SPS) are a fundamental building block for optical implementations of quantum information protocols. Among SPSs, multiple crystal heralded single seem to give the best compromise between high pair production rate and low events. In this work, we study their performance in practical key distribution experiment, by evaluating achievable rates. The analysis focuses on two different schemes, symmetric asymmetric, proposed implementation sources, with attention composing...
The future envisaged global-scale quantum communication network will comprise various nodes interconnected via optical fibers or free-space channels, depending on the link distance. segment of such a should guarantee certain key requirements, as daytime operation and compatibility with complementary telecom-based fiber infrastructure. In addition, space-to-ground links require capability designing light compact devices to be placed in orbit. For these reasons, investigating available...
Satellite quantum communications have rapidly evolved in the past few years, culminating proposal, development, and deployment of satellite missions dedicated to key distribution realization fundamental tests mechanics space. However, comparison with more mature technology based on fiber optics, several challenges are still open, such as capability detecting, high temporal accuracy, single photons coming from orbiting terminals. laser ranging, commonly used estimate distance, could also be...
Abstract We present and analyze an architecture for a European-scale quantum network using satellite links to connect Quantum Cities, which are metropolitan networks with minimal hardware requirements the end users. Using NetSquid, simulation tool based on discrete events, we assess benchmark performance of such linking distant locations in Europe terms key distribution rates, considering realistic parameters currently available or near-term technology. Our results highlight limits current...
Abstract Quantum key distribution using three states in equiangular configuration combines a security threshold comparable with the one of Bennett-Brassard 1984 protocol and quantum bit error rate (QBER) estimation that does not need to reveal part key. We implement an entanglement-based version Renes 2004 protocol, only passive optic elements linear scheme for positive-operator valued measure (POVM), generating asymptotic secure more than 10 kbit/s, mean QBER 1.6%. then demonstrate its case...
Quantum Key Distribution (QKD) enables secret key exchange between two remote parties with information-theoretic security rooted in the laws of quantum physics. Encoding information continuous variables (CV), such as values quadrature components coherent states light, brings implementations much closer to standard optical communication systems, but this comes at price significant complexity digital signal processing techniques required for operation low signal-to-noise ratios. In work, we...
We report on several experiments of single photon transmission from space to ground realized at the Matera Laser Ranging Observatory (MLRO) Italian Space Agency in (Italy). simulated a source coherent pulses attenuated level by exploiting laser ranging satellites equipped with corner-cube retroreflectors (CCRs). By such technique we QC qubits encoded polarization low-Earth-orbit (LEO) distance up 2500km station, achieving low quantum bit error ratio (QBER) for different satellites. The same...
We report on the characterization of a SiGe PIC-based receiver along with its usage in Gaussian-modulated coherent state CV-QKD setup. Excess noise measurements lead to secret key rate estimations 280 kbit/s at 6.9 km.
We report on the characterization of a SiGe PIC-based receiver along with its usage in Gaussian-modulated coherent state CV-QKD setup. Excess noise measurements lead to secret key rate estimations 280 kbit/s at 6.9 km.
Here we present a daylight QKD system using silicon photonics. The exhibits continuous daytime operation, outperforms comparable systems by two orders of magnitude, and represents promising resource for future satellite missions.
Future quantum communication infrastructures will rely on both terrestrial and space-based links integrating high-performance optical systems engineered for this purpose. In downlinks in particular, the loss budget variations signal propagation due to atmospheric turbulence effects impose a careful optimization of coupling light single-mode fibers required interfacing with receiving stations ground networks. work, we perform comprehensive study role adaptive optics (AO) optimization,...
The Einstein Equivalence Principle (EEP) underpins all metric theories of gravity. One its key aspects is the local position invariance (LPI) non-gravitational experiments, which captured by gravitational red-shift. iconic red-shift experiment places two fermionic systems, used as clocks, in different potentials and compares them using electromagnetic field. However, field itself can be a clock, comparing phases acquired optical pulses propagating through potentials. A fundamental point...
Free-space optical communication systems always require a precise focusing at the receiver. Unfortunately, when transmitted beam passes through atmosphere wavefront is distorted by time variant inhomogeneity of refractive index, causing strong fluctuations in power coupled into single-mode fiber We present an transmission system with Multi-Actuator Lens (MAL) capable to increase coupling efficiency from about 5% absence correction 20%. The measurements have been performed indoor artificially...
We present a highly modular Open Source Software to perform CV-QKD experiments. The software is hardware agnostic and was benchmarked on bulk integrated receivers, reaching state of the art secret key rates.
Future quantum networks will be composed of both terrestrial links for metropolitan and continent-scale connections space-based global coverage infrastructure resilience. However, the propagation signals through atmosphere is severely impacted by effects turbulence. This even more case entanglement-based communication protocols requiring two free-space channels to considered simultaneously. In this work, we assess advantage turbulence mitigation adaptive optics, in particular during daytime...