Quantum Lab

Quantum state teleportation represents a pillar of quantum information and a milestone on the roadmap towards quantum networks with a large number of nodes. Successful photonic demonstrations of this protocol have been carried out employing different qubit encodings. However, demonstrations in the Fock basis encoding are challenging, due to the impossibility of generating a coherent … Continua a leggere

Fabio Sciarrino is presenting “Photonics Quantum Technologies @NQSTI for Quantum Computing” at the Quantum Computing @INFN workshop (website: https://agenda.infn.it/event/42801/overview), held in Padova on 29-31 October 2024. The workshop represented an opportunity for the community to come together and receive training, with the objectives of presenting ongoing activities, fostering the exchange of knowledge and experiences, and attracting … Continua a leggere

In the current era of noisy intermediate-scale quantum computers, variational quantum algorithms represent one of the most viable approaches for their application to solve tasks of interest. These algorithms train a parameterized quantum circuit to execute a specific task encoded in a cost function that needs to be minimized using a classical optimizer. In this … Continua a leggere

Generating and manipulating randomness is essential for numerous information technology applications, and quantum mechanics has been shown to offer distinct advantages in this area. A notable model for randomness manipulation is the Bernoulli factory, which enables the controlled adjustment of the bias in Bernoulli random processes. Initially, this framework was explored entirely within a classical … Continua a leggere

The Quantum Lab group of Sapienza University organized an engaging didactic exposition on quantum mechanics and quantum technologies titled “Dire l’indicibile” as part of the European Researcher’s Night 2024, held at Città dell’Altra Economia last weekend in Roma (link: https://www.scienzainsieme.it/). The event aimed to explore the fascinating and often counterintuitive world of quantum mechanics, making … Continua a leggere

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 … Continua a leggere

The exploitation of certification tools by end users represents a fundamentalaspect of the development of quantum technologies as the hardware scales upbeyond the regime of classical simulatability. Certifying quantum networksbecomes even more crucial when the privacy of their users is exposed tomalicious quantum nodes or servers as in the case of multi-client distributedblind quantum computing, … Continua a leggere

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 of probing the quantum nature of a variable by using it to mediate entanglement and yields theoretical and experimental insights, clarifying the operational … Continua a leggere

A seminal task in quantum information theory is to realize a device able to produce copies of a generic input state with the highest possible output fidelity, thus realizing an optimal quantum cloning machine. Recently, the concept of variational quantum cloning was introduced: a quantum machine learning algorithm through which, by exploiting a classical feedback … Continua a leggere