How Photons with Spin and Twist Become Logical Machines

Congratulations to Matteo Sanna and the team led by Lorenzo Pavesi at the University of Trento for their recent publication in npj Quantum Information:

📄 Four-qubit variational algorithms in silicon photonics with integrated entangled photon sources

Kudos also to Alessio Baldazzi, Massimo Borghi, and Stefano Azzini for this outstanding piece of Italian quantum research.

This work marks a significant milestone:

 ✅ execution of variational quantum algorithms on a photonic integrated circuit,

 ✅ operating at room temperature,

 ✅ with on-chip entangled photon pair sources,

 ✅ using entangled ququarts to run a VQE (for H₂) and variational factorization.

A concrete step towards practical, scalable photonic quantum computing — no cryogenics required.

📌 We are especially proud to share this result because Matteo Sanna is now part of the Rotonium team, where we continue developing a sustainable and scalable vision for photonic quantum computing.

🎓 This research was conducted during his PhD at the University of Trento and is a brilliant example of how academic innovation can fuel deep tech entrepreneurship.