Welcome !

This is the website of the Laboratory of Nonlinear Photonics and Theoretical Physics at the Department of Physics of the University Sapienza and the Institute for Complex Systems of the National Research Council. Our program is applying paradigms from the science of complex systems to light propagation, and investigating the development of complexity and self-organization in nonlinear waves. We want to test and deepen ideas of fundamental physics by using optics and photonics, and developing experiments, high performance computing approaches, and theory.

Please visit our research pages or our Blog.







How much can you twist a ultrashort pulse?

If you have a ultrashort pulse, and you want to add angular momentum, you have limitations.

This is what Andrea Ornigotti, Claudio Conti, and Alexander Szameit, discovered and published in the Physical Review Letters. An extended and generalized analysis can be found in Physical Review A.

Angular momentum of light is nowadays largely studied because you can add information to a optical beam by twisting it, or you can rotate objects by lasers with angular momentum. But if you want to transmit information, the best thing to do is using light pulses and adding to any pulse a certain amount of orbital angular momentum (OAM).  For example, by using m levels of OAM, any single pulse can encode m symbols (2 symbols correspond to one bit). The shortest the pulse you use, the higher the number of symbols you can transmit in a second (the transmission rate). This approach can be used for new classical and quantum high-bit rate transmission systems in free space or in fiber. 

But Ornigotti and others find out that the number of OAM bits you can store in a single pulse is actually limited by the duration of the pulse and by its carrier frequency.

The following picture shows the link between OAM units m and the number of optical cycles in the pulse, these two quantized observables are actually strictly related.



These findings have important outcomes in the modern multilevel transmission systems, but also reveal a novel form of spatio-temporal coupling. The latter may lead to new kinds of entanglement, which may trigger applications in Quantum Optics.




Last Updated (Sunday, 04 October 2015 12:18)


The John Templeton Foundation !

Great news ! 

The John Templeton Foundation is funding us!

Out project "Generalized Uncertainty Principle and the Photon" has been funded for searching the links between quantum gravity and photonics.


Last Updated (Sunday, 30 August 2015 10:02)


The New Theory for Rogue Waves featured in SPIE Newsroom !


14 August 2015, SPIE Newsroom. DOI: 10.1117/2.1201507.006035


Last Updated (Wednesday, 19 August 2015 14:26)


Irreversibility of Shock Waves Explained by Nonlinear Gamow Vectors

Editors of Physical Review A have retained among their suggestions a paper published by Silvia Gentilini, Maria Chiara Braidotti, Giulia Marcucci, Eugenio Del Re and Claudio Conti about a novel theoretical approach for the description of shock waves in nonlinear nonlocal media.

The novel theory is based on ideas retained from Irreversible Quantum Mechanics, a novel formulation of quantum mechanics based on the so-called Rigged Hilbert Space that include explonential decaying wavefuctions.

The theory describes the shock and wave-breaking scenario beyond the limits of the usual hydrodynamic approach, and allows to derive closed forms for the degree of irreversibility. This approach also introduces the "nonlinear Gamow Vectors," a novel kind of nonlinear waves with many possible applications in nonlinear physics.


Last Updated (Wednesday, 05 August 2015 08:28)