Mattia Walschaers

Mattia Walschaers


Multimode Quantum Optics




Mattia Walschaers got his PhD from the universities of Freiburg (Germany) and Leuven (Belgium) for a cotutelle project, supervised by Andreas Buchleitner and Mark Fannes. His work initially focused on the role of quantum effects in photosynthesis, where he developed analytically solvable toy models to better understand the role of disorder in coherent transport of photosynthetic excitons. Later on, his interest shifted to many-particle systems. First he tried to understand the highest possible current that can flow through many-fermion systems in a non-equilibrium steady state. Then the attention shifted to dynamical features of many-particle systems on transient time scales. In particular, Mattia spent a big part of the final years of his PhD project working on many-particle interference a phenomenon which induced by indistinguishability of quantum particles. This ultimately led to the development of an experimentally implementable statistical benchmark for boson sampling.
The resulting dissertation was published as a book in the Springer Theses series, and it was also one of the four nominees for the SAMOP dissertation prize of the German Physical Society.

Since September 2016, Mattia is a post-doctoral researcher in multimode quantum optics group of the Laboratoire Kastler Brossel, where his research interests shifted to continuous-variable quantum optics and quantum information. With specific interest for highly multimode systems, he mixes standard approaches in the field with tools from statistical physics. At the moment, most of his attention is devoted to understanding experimentally feasible non-Gaussian states in these systems. As such, he used techniques based on multimode correlation functions to develop a general framework to study multimode photon addition and subtraction.
In May 2018, Mattia was awarded a research fellowship from the German Research Foundation (DFG) to extend his stay at the LKB and further explore these topics.

Selected Publications


Full Bibliography

  • D. S. Phillips, M. Walschaers, J. J. Renema, I. A. Walmsley, N. Treps, J. Sperling, Benchmarking of Gaussian boson sampling using two-point correlators, Phys. Rev. A 99, 023836 (2019).
Research articles
  • T. Giordani, F. Flamini, M. Pompili, N. Viggianiello, N. Spagnolo, A. Crespi, R. Osellame, N. Wiebe, M. Walschaers, A. Buchleitner, and F. Sciarrino, Experimental statistical signature of many-body quantum interferenceNat. Photonics 12, 173-178 (2018).
  • C. Dittel, G. Dufour, M. Walschaers, G. Weihs, A. Buchleitner, and R. Keil, Totally destructive many-particle interferencePhys. Rev. Lett. 120, 240404 (2018).
  • C. Dittel, G. Dufour, M. Walschaers, G. Weihs, A. Buchleitner, and R. Keil, Totally destructive interference for permutation-symmetric many-particle statesPhys. Rev. A 97, 062116 (2018).
  • V. N. Shatokhin, M. Walschaers, F. Schlawin, and A. Buchleitner, Coherence turned on by incoherent lightNew J. Phys. 20, 113040 (2018).
  • M. Walschaers, S. Sarkar, V. Parigi, and N. Treps, Tailoring Non-Gaussian Continuous-Variable Graph StatesPhys. Rev. Lett. 121, 220501 (2018).
Research articles
Research articles
Review articles
Research articles
  • T. Zech, M. Walschaers, T. Scholak, R. Mulet, T. Wellens, and A. Buchleitner, Quantum transport in biological functional units: Noise, disorder, structureFluct. Noise Lett. 12, 1340007 (2013).
  • M. Walschaers, J. Fernandez-de-Cossio Diaz, R. Mulet, and A. Buchleitner, Optimally Designed Quantum Transport across Disordered NetworksPhys. Rev. Lett. 111, 180601 (2013).
  • M. Walschaers, R. Mulet, T. Wellens, and A. Buchleitner, Statistical theory of designed quantum transport across disordered networksPhys. Rev. E 91, 042137 (2015).
  • Y.-S. Ra, A. Dufour, M. Walschaers, C. Jacquard, T. Michel, C. Fabre, N. Treps, Non-Gaussian quantum states of a multimode light field, arXiv:1901.10939