Quantum Lab

A joint paper between IFN-CNR, CNRS and Sapienza on a new method for the quantification of n-photon indistinguishability has been published in PRX! We report on a universal method to measure the genuine indistinguishability of n-photons – a crucial parameter that determines the accuracy of optical quantum computing. Our approach relies on a low-depth cyclic … Continua a leggere

On arxiv today the preprint of the work developed in the context of the international collaboration Quantum Information Structure of Spacetime (QISS). Detecting gravity mediated entanglement can provide evidence that the gravitational field obeys quantum mechanics. We report the result of a simulation of the phenomenon using a photonic platform. The simulation tests the idea … Continua a leggere

Entanglement-based quantum key distribution can enable secure communication in trusted node-free networks and over long distances. Although implementations exist both in fiber and in free space, the latter approach is often considered challenging due to environmental factors. Here, we implement a quantum communication protocol during daytime for the first time using a quantum dot source. … Continua a leggere

Quantum networks play a crucial role in distributed quantum information processing, enabling the establishment of entanglement and quantum communication among distant nodes. Fundamentally, networks with independent sources allow for new forms of nonlocality, beyond the paradigmatic Bell’s theorem. Here we implement the simplest of such networks—the bilocality scenario—in an urban network connecting different buildings with … Continua a leggere

Boson Sampling is a computational paradigm representing one of the most viable and pursued approaches to demonstrate the regime of quantum advantage. Recent results have shown significant technological leaps in single-photon generation and detection, leading to progressively larger instances of Boson Sampling experiments in different photonic systems. However, a crucial requirement for a fully-fledged platform … Continua a leggere

Gaussian Boson Sampling is a non-universal model for quantum computing inspired by the original formulation of the Boson Sampling problem. Nowadays, it represents a paradigmatic quantum platform to reach the quantum advantage regime in a specific computational model. Indeed, thanks to the implementation in photonics-based processors, the latest Gaussian Boson Sampling experiments have reached a … Continua a leggere

Since Bell’s theorem, it is known that local realism fails to explain quantum phenomena. Indeed, Bell inequality violations manifestly show the incompatibility of quantum theory with classical notions of cause and effect. As recently discovered, however, the instrumental scenario –a pivotal tool in causal inference– allows for nonclassicality signatures going beyond this paradigm. Indeed, if … Continua a leggere

Quantum walks represent paradigmatic quantum evolutions, enabling powerful applications in the context of topological physics and quantum computation. They have been implemented in diverse photonic architectures, but the realization of two-particle dynamics on a multidimensional lattice has hitherto been limited to continuous-time evolutions. To fully exploit the computational capabilities of quantum interference it is crucial … Continua a leggere

UPDATE: Nuove date per la mostra “Dire l’indicibile: la sovrapposizione quantistica”. Un percorso espositivo sulla meccanica quantistica, dalla sua formulazione alla nascita e sviluppo delle tecnologie quantistiche. Vi aspettiamo anche nelle nuove date dall’11 al 13 aprile al Museo dell’Arte Classica della Sapienza. Scarica la locandina aggiornata Prenotazioni su https://sites.google.com/uniroma1.it/sapienzaquantumweeks Un viaggio tra arte e … Continua a leggere