Scaling-up optical quantum technologies requires a combination of highly efficient multi-photon sources and integrated waveguide components. Here, we interface these scalable platforms, demonstrating high-rate three-photon interference with a quantum dot based multi-photon source and a reconfigurable photonic chip on glass. We actively demultiplex the temporal train of single photons obtained from a quantum emitter to … Continua a leggere

Introducing quantum sensors as a solution to real world problems demands reliability and controllability outside of laboratory conditions. Producers and operators ought to be assumed to have limited resources readily available for calibration, and yet, they should be able to trust the devices. Neural networks are almost ubiquitous for similar tasks for classical sensors: here … Continua a leggere

Quantum technologies comprise an emerging class of devices capable of controlling superposition and entanglement of quantum states of light or matter, to realize fundamental performance advantages over ordinary classical machines. The technology of integrated quantum photonics has enabled the generation, processing and detection of quantum states of light at a steadily increasing scale and level … Continua a leggere

The wave or particle duality has long been considered a fundamental signature of the nonclassical behavior of quantum phenomena, especially in a delayed choice experiment, where the experimental setup revealing either the particle or the wave nature of the system is decided after the system has entered the apparatus. However, as counterintuitive as it might … Continua a leggere

QuantumLab is participating in the Quantum Information Structure of Spacetime (QISS) project funded from the John Templeton Foundation, 2019-2022 What is QISS?QISS is a cross–disciplinary fundamental research initiative in the broader fields of Quantum Information and Quantum Gravity, aiming to put the physics of quantum spacetime on an information theoretical basis, bring within reach empirical access … Continua a leggere

The image on the cover for Advanced Photonics Volume 1, Issue 4, provides a pictorial view of the hybrid two-photon entangled state. Quantum entanglement is present between the polarization of a first photon (bottom) and the vector vortex state of a second photon (top). The second photon has been transmitted through an air-core fiber and … Continua a leggere

Entanglement distribution between distant parties is one of the most important and challenging tasks in quantum communication. Distribution of photonic entangled states using optical fiber links is a fundamental building block toward quantum networks. Among the different degrees of freedom, orbital angular momentum (OAM) is one of the most promising due to its natural capability … Continua a leggere

Instrumental variables allow the estimationof cause and effect relations even in pres-ence of unobserved latent factors, thus provid-ing a powerful tool for any science whereincausal inference plays an important role.More recently, the instrumental scenario hasalso attracted increasing attention in quantumphysics, since it is related to the seminal Bell’stheorem and in fact allows the detection ofeven … Continua a leggere

Quantum tomography is currently the mainly employed method to characterize a quantum system and therefore plays a fundamental role when trying to characterize the action of a particular channel. Nonetheless, quantum tomography works on the premise of a full characterization and description of the devices preparing the quantum state and realizing the measurements. Such an … Continua a leggere