A Bernoulli factory is a randomness manipulation routine that takes as input a Bernoulli random variable, outputting another Bernoulli variable whose bias is a function of the input bias. Recently proposed quantum-to-quantum Bernoulli factory schemes encode both input and output variables in qubit amplitudes. This primitive could be used as a subroutine for more complex … Leggi tutto

Fabio Sciarrino has been invited at Galileo Festival and he will speak about “Supercomputing: from research to quantum computers”. Programme: https://www.galileofestival.it/programma/

Recent developments have led to the possibility of embedding machine learning tools into experimental platforms to address key problems, including the characterization of the properties of quantum states. Leveraging on this, we implement a quantum extreme learning machine in a photonic platform to achieve resource-efficient and accurate characterization of the polarization state of a photon. … Leggi tutto

Il Premio Ugo Fano istituito nel 2015 quest’anno vedrà tra i premiati Fabio Sciarrino per i recenti progressi nel campo della fisica e delle tecnologie fotoniche quantistiche. La premiazione si svolgerà giovedì 21 marzo a Roma presso l’Aula Marconi del CNR, P.le Aldo Moro. Leggi anche: https://nqsti.it/events/premio-ugo-fano-2024-cento-anni-dalla-nascita-della-meccanica-quantistica

Single-photon sources based on semiconductor quantum dots find several applications in quantum 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 a possible solution relying on the interference in probabilistic gates of identical photons emitted at different … Leggi tutto

INL, Sapienza University of Rome, CNR-INF and Politecnico di Milano, have recently published a new study that demonstrates how to certify several quantum properties of devices of increasing complexity. The paper was published on November 3rd in the journal Science Advances (full publication here). Programmable optical circuits are one of the leading architectures for quantum information processing. They enable tests of key aspects … Leggi tutto

Programmable integrated optical circuits are among the leading architectures for quantum information processing, enabling tests of foundational properties of quantum mechanics, with applications in metrology, cryptography, and computation. The nonclassical processing of information encoded by quantum states of light in these devices lies at the core of these applications. As new devices grow in size … Leggi tutto

High-dimensional biphoton states are promising resources for quantum applications, ranging from high-dimensional quantum communications to quantum imaging. A pivotal task is fully characterizing these states, which is generally time-consuming and not scalable when projective measurement approaches are adopted; however, new advances in coincidence imaging technologies allow for overcoming these limitations by parallelizing multiple measurements. Here … Leggi tutto

In a Bell experiment, it is natural to seek a causal account of correlations wherein only a common cause acts on the outcomes. For this causal structure, Bell inequality violations can be explained only if causal dependencies are modeled as intrinsically quantum. There also exists a vast landscape of causal structures beyond Bell that can … Leggi tutto

Estimation of physical quantities is at the core of most scientific research, and the use of quantum devices promises to enhance its performances. In real scenarios, it is fundamental to consider that resources are limited, and Bayesian adaptive estimation represents a powerful approach to efficiently allocate, during the estimation process, all the available resources. However, … Leggi tutto