Quantum Lab

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

Experimental engineering of high-dimensional quantum states is a crucial task for several quantum information protocols. However, a high degree of precision in the characterization of the noisy experimental apparatus is required to apply existing quantum-state engineering protocols. This is often lacking in practical scenarios, affecting the quality of the engineered states. We implement, experimentally, an … Continua a leggere

Adopting quantum resources for parameter estimation discloses the possibility to realize quantum sensors operating at a sensitivity beyond the standard quantum limit. Such approach promises to reach the fundamental Heisenberg scaling as a function of the employed resourcesN in the estimation process. Although previous experiments demonstrated precision scaling approaching Heisenberg-limited performances, reaching such a regime … Continua a leggere

Quantum networks play a crucial role for 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 … 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 demonstrated significant technological leaps in single-photon generation and detection, leading to progressively larger experimental instances of Boson Sampling experiments in different photonic systems. However, a crucial requirement for a fully-fledged … Continua a leggere

The violation of a Bell inequality is the paradigmatic example of device-independent quantum information: the nonclassicality of the data is certified without the knowledge of the functioning of devices. In practice, however, all Bell experiments rely on the precise understanding of the underlying physical mechanisms. Given that, it is natural to ask: Can one witness … Continua a leggere

The orbital angular momentum (OAM) of light has been at the center of several classical and quantum applications for imaging, information processing and communication. However, the complex structure inherent in OAM states makes their detection and classification nontrivial in many circumstances. Most of the current detection schemes are based on models of the OAM states … Continua a leggere

Bell’s theorem is typically understood as the proof that quantum theory is incompatible with local hidden variable models. More generally, the violation of a Bell inequality can be seen as witnessing the impossibility of explaining quantum correlations with classical notion of causality. The violation of a Bell inequality, however, does not exclude that some level … Continua a leggere

Quantum key distribution—exchanging a random secret key relying on a quantum mechanical resource—is the core feature of secure quantum networks. Entanglement-based protocols offer additional layers of security and scale favorably with quantum repeaters, but the stringent requirements set on the photon source have made their use situational so far. Semiconductor-based quantum emitters are a promising … Continua a leggere