The generation and control of quantum correlations in high-dimensional systems is a major challenge in the present landscape of quantum technologies. Achieving such non-classical high-dimensional resources will potentially unlock enhanced capabilities for quantum cryptography, communication and computation. We propose a protocol that is able to attain entangled states of d-dimensional systems through a quantum-walk-based  transfer … Continua a leggere

Computer quantistici: istruzioni per l’usoBenvenuti nell’era della quantum supremacy Incontro con Fabio Sciarrino, modera Leonardo De Cosmo29 ottobre, ore 18:30 Delle tecnologie quantistiche si parla ormai ovunque ma è complicato riuscire a capirne davvero qualcosa. In un dialogo semiserio, un giornalista scientifico e uno dei più autorevoli ricercatori del settore cercheranno di raccontare cosa sono … Continua a leggere

Quantum communication networks involving the preparation, sharing, and measurement of quantum states are ubiquitous in quantum information. Of particular relevance within this context is to understand under which conditions a given quantum resource can give rise to correlations incompatible with a classical explanation. Here we consider the so-called prepare-and-measure scenario, in which a quantum or … Continua a leggere

Self-testing is a method of quantum state and measurement estimation that does not rely on assumptions about the inner working of the used devices. Its experimental realization has been limited to sources producing single quantum states so far. In this work, we experimentally implement two significant building blocks of a quantum network involving two independent … Continua a leggere

The PHOQUSING (PHOtonic Quantum SamplING machine) project, coordinated by the Quantum Information Lab, just started on 1 September 2020.The project was awarded a grant of more than 3 million Euros under the Horizon 2020 programme of the European Commission. The project will allow to join the forces of leading European Groups involved in quantum information … Continua a leggere

Quantum metrology is one of the most relevant applications of quantum information theory to quantum technologies. Here, quantum probes are exploited to overcome classical bounds in the estimation of unknown parameters. In this context, phase estimation, where the unknown parameter is a phase shift between two modes of a quantum system, is a fundamental problem. … Continua a leggere

Multi-particle interference is a key resource for quantum information processing, as exemplified by Boson Sampling. Hence, given its fragile nature, an essential desideratum is a solid and reliable framework for its validation. However, while several protocols have been introduced to this end, the approach is still fragmented and fails to build a big picture for … Continua a leggere

The image of the cover for AVS quantum science Volume 2 issue 2, provides a representation of a basic tool for photonic quantum phase estimation: the Mach-Zehnder interferometer. Here interfering quantum states of light can be exploited to extract information on unknown relative phase shifts, enhancing the sensitivity achievable by classical resources.  The cover image … Continua a leggere