|Sezione:||Nanoscienze e nanotecnologie|
|Gruppi e laboratori di ricerca:||Spettroscopia ottica e ottica quantistica|
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Marco Barbieri is affiliated to the Department of Science, where he is building a team working on quantum photonics. He collaborates with the quantum optics group at Sapienza, the ultrafast quantum optics group in Oxford and the LKB in Paris. His researches have delivered 40 publications in peer-reviewed journals and 10 invited talks at international and Italian conferences.
In 2011-2014, he has been a postdoctoral fellow and then a departmental lecturer at the University of Oxford, where he has worked in Ian Walmsley's research group on ultrafast quantum optics, quantum metrology, integrated quantum photonics, and quantum memories with some incursions in nonlinear optics in PC fibres and ultrashort pulses metrology.
In 2008-2011, he held a Marie Curie fellowship in the group of Philippe Grangier and Rosa Tualle-Brouri based at the Institut d'Optique in Paris, where he has been active on continuous-variable quantum communications.
In 2006-2008 he has worked as postdoc fellow in the group of Andrew White at the University of Queensland, Brisbane, on building quantum logic gates in the photonics architecture, exploring both technical and fundamental aspects.
In 2003-2006 he has completed his postgraduate studies at Sapienza Università di Roma, under the supervision of Paolo Mataloni and Francesco de Martini. The subject of his thesis addressed the generation and control of quantum correlations within photon pairs simultaneously in polarisation and optical path. In 2003 he has received his laurea in physics from the University of Bari - thanks are due to Enzo Berardi and Paolo Mataloni who've been kind enough to supervise him as a young annoying chap.
He is an expert in experimental quantum information processing with photons, with a taste for fundamental aspects. He has the awful habit of talking about himself in third person.
not mine, but those of my fellow colleagues
Boson Sampling. Is an optical quantum computer ever going to beat a classical machine? A possible race might consist in sending photons in a linear network and sample the distribution at the output. This is really difficult with a standard computer, since the distribution is related to the hard problem of estimating permanents. We have shown that the experiment works for a small number of photons.
J.B. Spring et al. Experimental boson sampling on a photonic chip. Science 339, 798 (2013).
Noiseless Amplification. Any amplifier must always preserve the signal-to-noise ratio. Well, not always. If you give up a device that works any given instance (but it's kind enough to let you know when it actually worked) you can increase the intensity of weak light pulses, and evade some fundamental limits valid for deterministic amplifiers. We have shown how this can be realised, and tested its operation conditions.
F. Ferreyrol et al. Implementation of a nondeterministic noiseless optical amplifier. Phys. Rev. Lett. 104, 123603 (2010).
Quantum computing without entanglement. Quantum entanglement is a strong correlation across quantum systems, and it is thought to be the fuel that speeds up quantum computers. However, there are instances where a quantum speed-up is observed, but the presence of entanglement is far from being clear. We have shown that in such computation there are other forms of milder quantum correlations that are generated. What their role could be is not yet understood, but our work has helped starting a new effort on understanding more general quantum correlations.
B.P. Lanyon et al. Experimental quantum computation without entanglement. Phys. Rev. Lett. 101, 200501 (2008).