Contact
Bio
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
- M. Walschaers, S. Sarkar, V. Parigi, and N. Treps, Tailoring Non-Gaussian Continuous-Variable Graph States, Phys. Rev. Lett. 121, 220501 (2018).
- M. Walschaers, C. Fabre, V. Parigi, and N. Treps, Entanglement and Wigner function negativity of multimode non-Gaussian states, Phys. Rev. Lett. 119, 183601 (2017).
- M. Walschaers, A. Buchleitner, and M. Fannes, On optimal currents of indistinguishable particles, New J. Phys. 19, 023025 (2017).
- M. Walschaers, J. Kuipers, J.-D. Urbina, K. Mayer, M. C. Tichy, K. Richter, and A. Buchleitner, Statistical Benchmark for BosonSampling, New J. Phys. 18, 032001 (2016).
- M. Walschaers, J. Fernandez-de-Cossio Diaz, R. Mulet, and A. Buchleitner, Optimally Designed Quantum Transport across Disordered Networks, Phys. Rev. Lett. 111, 180601 (2013).
Full Bibliography
- M. Walschaers, Y.-S. Ra, N. Treps, Mode-Dependent Loss Model for Multimode Photon-Subtracted States, Phys. Rev. A 100, 023828 (2019).
- 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 interference, Nat. Photonics 12, 173-178 (2018).
- C. Dittel, G. Dufour, M. Walschaers, G. Weihs, A. Buchleitner, and R. Keil, Totally destructive many-particle interference, Phys. 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 states, Phys. Rev. A 97, 062116 (2018).
- V. N. Shatokhin, M. Walschaers, F. Schlawin, and A. Buchleitner, Coherence turned on by incoherent light, New J. Phys. 20, 113040 (2018).
- M. Walschaers, S. Sarkar, V. Parigi, and N. Treps, Tailoring Non-Gaussian Continuous-Variable Graph States, Phys. Rev. Lett. 121, 220501 (2018).
Books
Research articles
- M. Walschaers, A. Buchleitner, and M. Fannes, On optimal currents of indistinguishable particles, New J. Phys. 19, 023025 (2017).
- M. Walschaers, R. Mulet, and A. Buchleitner, Scattering Theory of Efficient Quantum Transport across Finite Networks, J. Phys. B: At. Mol. Opt. Phys. 50, 224003 (2017).
- M. Walschaers, C. Fabre, V. Parigi, and N. Treps, Entanglement and Wigner function negativity of multimode non-Gaussian states, Phys. Rev. Lett. 119, 183601 (2017).
- M. Walschaers, C. Fabre, V. Parigi, and N. Treps, Statistical signatures of multimode single-photon added and subtracted states of light, Phys. Rev. A 96, 053835 (2017).
Research articles
- M. Walschaers, J. Kuipers, J.-D. Urbina, K. Mayer, M. C. Tichy, K. Richter, and A. Buchleitner, Statistical Benchmark for BosonSampling, New J. Phys. 18, 032001 (2016).
This article was featured in an associated perspective. - M. Walschaers, J. Kuipers, and A. Buchleitner, From Many-Particle Interference to Correlation Spectroscopy, Phys. Rev. A 94(R), 020104 (2016).
Review articles
- M. Walschaers, F. Schlawin, T. Wellens, and A. Buchleitner, Quantum Transport on Disordered and Noisy Networks: An Interplay of Structural Complexity and Uncertainty, Annu. Rev. Condens. Matter Phys. 7, 223 { 248 (2016).
Research articles
- T. Zech, M. Walschaers, T. Scholak, R. Mulet, T. Wellens, and A. Buchleitner, Quantum transport in biological functional units: Noise, disorder, structure, Fluct. Noise Lett. 12, 1340007 (2013).
- M. Walschaers, J. Fernandez-de-Cossio Diaz, R. Mulet, and A. Buchleitner, Optimally Designed Quantum Transport across Disordered Networks, Phys. Rev. Lett. 111, 180601 (2013).
- M. Walschaers, R. Mulet, T. Wellens, and A. Buchleitner, Statistical theory of designed quantum transport across disordered networks, Phys. Rev. E 91, 042137 (2015).
Research articles
- 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
- F. Flamini, M. Walschaers, N. Spagnolo, N. Wiebe, A. Buchleitner, F. Sciarrino, Requirements for the validation of a quantum advantage in Boson Sampling, arXiv:1904.12318
Reviews
- M. Walschaers, Signature of Many-Particle Interference, arXiv:1908.08370