Published paper in Scientific Reports on April 2020

We propose and demonstrate an on-chip optofluidic device allowing active oscillatory microrheological measurements with sub-μL sample volume, low cost and high flexibility. The core elements of the optical part, integrated waveguides and an optical modulator, are fabricated by fs-laser writing on a glass substrate. The system performance is validated by measuring viscoelastic solutions of aqueous worm-like micelles composed by Cetylpyridinium Chloride (CPyCl) and Sodium Salicylate (NaSal).

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Published paper in Optical Materials: X on December 2019

Femtosecond Laser Irradiation followed by Chemical Etching (FLICE) is a powerful technique for prototyping three-dimensional structures in glass. Here we show that it is possible to apply FLICE also to a commercial alumino-borosilicate glass, where very complex and low-loss photonic circuitry has been demonstrated recently. As a test for the technique, we realize an optofluidic device composed of a microchannel and two intersecting optical waveguides.

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Published paper in Optica on December 2019

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 show that this combination of scalable sources and reconfigurable photonic circuits compares favorably in performance with respect to previous implementations and that merging these platforms could allow 10-photon experiments on chip at ∼40 s−1 rate in a foreseeable future.

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Published paper in Journal of Lightwave Technology on September 2019

Phase shifters are devices that offer the possibility to dynamically reconfigure the properties of photonic integrated circuits (PICs), thus greatly extending their quality and applicability. In this paper, we provide a thorough discussion of the main problems that one can encounter when using thermal phase shifters. We show how all these issues can be solved and the performance improved by manufacturing optimized thermal shifters in femtosecond-laser-written PICs (FLW-PICs). The unprecedented results in terms of power dissipation, miniaturization and stability enable the scalable implementation of reconfigurable FLW-PICs for exploitation in many applications.

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Published paper in Physical Review Letters on August 2019

With this work, we report on the quantum storage of a heralded frequency-multiplexed single photon in an integrated laser-written rare-earth doped waveguide.  In particular, a frequency-multimode photon is stored in a praseodymium-doped waveguide using the atomic frequency comb (AFC) scheme and we demonstrate that the storage preserves the nonclassical properties of the single photon.

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Published paper in Advanced Photonics on May 2019

Boson sampling is a computational problem that has recently been proposed as a candidate to obtain an unequivocal quantum computational advantage. This prospect has stimulated much effort resulting in the experimental implementation of progressively larger devices. We review recent advances in photonic boson sampling, describing both the technological improvements achieved and the future challenges.

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Published paper in Physical Review Letters on April 2019

Decay of an excited system to its ground state is a ubiquitous phenomenon in all branches of physics. Here we use a photonic simulator to show specific and counterintuitive features of such decay in quantum systems. Significant deviations from the widely accepted exponential decay dynamics are experimentally demonstrated, in particular showing oscillatory behavior at very long decay times. Such oscillation are due to quantum interference effects and mean that in this region the decay process is not monotonic but there is the possibility that the system is re-excited by the interaction with the environment.

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