Yesterday we celebrated the PhD defense of Diego, who presented his thesis on new approaches to quantum state tomography. His dedication and insight have inspired us all. His presence in the group will be greatly missed, and we wish him every success ahead.

Congratualtions to Alice on successfully defending her PhD thesis on quantum nonlinear integrated photonics. Her collaborative spirit and positive have enriched our group. We wish her an exciting journey ahead.

I’ll be visiting the group of Khabat Heshami at the NRC in Ottawa on March 5–6.
Looking forward to great discussions and exchanging ideas during the visit!

We report a new approach for the characterization of high-gain pulsed squeezed light from silicon nitride microresonators via time-resolved measurements, revealing key performance limits and optimization paths. Results soon in Phys. Rev. Appl., stay tuned!

I’m looking forward to the Quantum Italian Forum on February 5 in Milan, a workshop dedicated to quantum technologies and innovation. Happy to contribute to the discussion, sharing perspectives on research, industry collaboration, and future opportunities.

Happy to announce that our work on a silicon-integrated source of hyper-entangled photon pairs, exceeding 10⁹ pairs/s, is now available in npj Nanophotonics.

Grateful for an exciting 2025 filled with discoveries, collaborations, and growth. Wishing everyone a joyful, healthy, and fruitful 2026. It may it bring bold ideas, shared successes, and continued inspiration across our community worldwide together in science.

On Dec 17, I attended the Stati Generali Quantum with fellow NQSTI members to discuss the future of quantum technologies alongside colleagues from all Italy and representatives of the Italian government.

Thrilled to share results from our collaboration with Fabio Sciarrino’s group at Roma La Sapienza, demonstrating threshold quantum state tomography on photonic systems up to four qubits. Findings are now available in npj Quantum Information.

From Nov. 10 to Nov. 15 I will be visiting UofT and Xanadu. On Friday, Nov. 13 I will present work on a Maxwell’s demon at the Centre for Quantum Information and Quantum Control.Click here for details.

Visiting Krister Shalm at the University of Colorado Boulder, November 5–7, to present some recent results. Looking forward to discussing physics in this wonderful place, so rich in ideas and talented people!

We develop a general framework to model spontaneous emission in integrated photonics, enabling efficient and flexible design of tunable single-photon sources. The results are now published in Physical Review A.

Excited to join the amazing Ephos team in Milan during my sabbatical year! Looking forward to an inspiring journey exploring powerful, programmable 3D photonics in glass, a perfect blend of science and innovation. 🚀

I am pleased to announce my participation as a speaker at the Digital Innovation Forum, taking place in Villa Erba, Cernobbio, from October 14 to 17, 2025.

We demonstrated bipartite Gaussian boson sampling with squeezed light in time-frequency domains from a silicon-nitride photnic chip. High-fidelity four-photon events probed isomorphic graph similarity. Full results are avialble in npj Quantum Information.

I will attend the workshop "New Trends in Photonics" in Como, September 16–18 2025, where I will present the contribution "Squeezing nonclassical light out of a photonic chip". Looking forward to inspiring discussions!

Our work on the generation of hyperentangled photon pairs in the time and frequency domain on a silicon photonic chip is now avaialble in Optics Letters.

Our work on ultrabroadband resonant frequency doubling on a chip is now available in Nature Communications! We demonstrate over 200 nm of second-harmonic bandwidth using linearly uncoupled microrings with reconfigurable phase matching.

Our paper on the modeling and optimization of pulsed squeezed state generation in a ring-resonator system” is now published in Physical Review A. 

I will be speaking at ICTON 2025 in Barcelona, July 6–10 2025, on the latest breakthroughs in integrated photonics. Join me for engaging sessions and networking at the International Conference on Transparent Optical Networks! 

My group and I will be at CLEO 2025 with several contributions in classical and quantum photonics. For more details, please visit the CLEO website See you in Los Angeles!

Happy to share the results of our collaboration on frequency-bin entanglement-based QKD, published in NPJ Quantum Information. Using silicon ring resonators and real-time phase correction, we achieved secure key distribution over 26 km of fiber at 4.5 bps.

Our new Phys. Rev. A work introduces a compressed-sensing-inspired method that drastically reduces measurements needed for quantum state tomography of N-qudit systems.

Our new work on selective Q-factor tuning in silicon nitride microresonators has been accepted in J. Lightwave Technol.—from 65k to 3M, without disturbing other modes! Stay tuned!

Exciting news! Our paper “Versatile chip-scale platform for high-rate entanglement generation using an AlGaAs microresonator array”, a collaboration between UniPV and UCSB has been accepted in PRX Quantum! Stay tuned for publication updates.

We demonstrate how III-V semiconductor microring resonators can efficiently generate photon pairs and squeezed vacuum states via angular spontaneous parametric down-conversion. Read more.

Join us for the 2nd Congress of the National Quantum Science and Technology Institute (NQSTI), bringing together leading researchers and innovators in quantum technologies. Don’t miss this key event! Learn more.

We’re thrilled to announce the publication of our article, "Photonic multipartite entanglement in discrete variables without arbitrary unitaries," Check new approaches to achieve entanglement in Physical Review Research! 

Wishing everyone a joyful and prosperous 2025! May the new year bring exciting opportunities, success, and happiness. Happy New Year!

Jacopo Piantanida Chiesa, PhD candidate at Leiden University talks about the present and the future of superconducting nanowire single-photon detectors on December 18th at 3 PM in Aula dottorato.

Looking forward to a week at Xanadu Quantum Technology in Toronto, Canada, from Nov 23 to Nov 30. I’m excited to share insights on quantum photonics advancements and explore cutting-edge research with the Xanadu team.

Check out our new Optics Letters publication, “Squeezing enhancement by suppression of noise through a resonant interferometric coupler” in which we show a new integrated device to improve squeezing in realistic condition. Don’t miss it! 

Exciting news! Our work, “Superspontaneous Four-Wave Mixing in a Sequence of Lossy Ring Resonators,” exploring superradiance and nonclassical light generation is the Editor's pick in Phys. Rev. A! 

Join us on Thursday, September 26, 2024, at 10:00 AM in Aula Dottorato for Costantino De Angelis’ talk on “Analog Computing with Nonlinear Flat Optics.” Discover cutting-edge advancements in flat-optics technology.

I will be attending the IEEE Quantum Week 2024 in Montreal and giving a talk at the workshop "Quantum Photonics: From Optical Table to Chip" on Sept. 18th. more details can be found here. See you in Montreal!

Excited to announce our latest publication in Optics Letters: “Broadband SPDC in Reconfigurable Poled Linearly Uncoupled Resonators.” Discover a novel method for wideband photon pair generation without dispersion engineering!

We explored how we measured the joint temporal intensity of photon pairs in a silicon nitride microresonator. This technique will be handy for studying the correlation of photon pairs in high-Q systems. These results are now available in Optics Letters! 

Excited to announce our new work entitled “A Tailor-made Quantum State Tomography Approach”.  Our new protocol significantly reduces measurement requirements for quantum state reconstruction, maintaining high accuracy even with fewer measurements. These results are now published in APL Quantum! 

In collaboration with the Photonic Quantum Lab at the University of Pavia, we show that photon number distribution of squeezed light can be reconstructed without photon number resolving detectors. Results are now available in Optica Quantum!

Excited to speak at the Plasmonica International School on Plasmonics and Nano-optics in Como, Italy on June 5! I’ll be discussing the generation of squeezed light in microresonators, exploring its transformative potential in quantum technologies. Looking forward to an engaging session!