A. Crespi, R. Osellame, R. Ramponi, M. Bentivegna, F. Flamini, N. Spagnolo, N. Viggianiello, L. Innocenti, P. Mataloni, and F. Sciarrino, “Suppression law of quantum states in a 3-D photonic fast Fourier transform chip”, Nature Communications 7, 10469 (2016).
WHAT IS PINT OF SCIENCE? Our aim is to deliver science talks in a fun, engaging and approachable way by bringing them to a pub close to you. We will bring you the most interesting and knowledgeable scientists around to give a talk about their research. You just sit back, sip your drink, listen and … Continua a leggere
The importance of integrated quantum photonics in the telecom band is based on the possibility of interfacing with the optical network infrastructure that was developed for classical communications. In this framework, femtosecond laser-written integrated photonic circuits, which have already been assessed for use in quantum information experiments in the 800-nm wavelength range, have great potential. In fact, these circuits, being written in glass, can be perfectly mode-matched at telecom wavelength to the in/out coupling fibers, which is a key requirement for a low-loss processing node in future quantum optical networks. In addition, for several applications, quantum photonic devices must be dynamically reconfigurable. Here, we experimentally demonstrate the high performance of femtosecond laser-written photonic circuits for use in quantum experiments in the telecom band, and we demonstrate the use of thermal shifters, which were also fabricated using the same femtosecond laser, to accurately tune such circuits. State-of-the-art manipulation of single- and two-photon states is demonstrated, with fringe visibilities greater than 95%. The results of this work open the way to the realization of reconfigurable quantum photonic circuits based on this technological platform.
“Thermally reconfigurable quantum photonic circuits at telecom wavelength by femtosecond laser micromachining”, F. Flamini, L. Magrini, A. S. Rab, N. Spagnolo, V. D’Ambrosio, P. Mataloni, F. Sciarrino, T. Zandrini, A. Crespi, R. Ramponi, R. Osellame, Light: Science & Applications 4, e354 (2015).
Quantum technologies promise to improve the way we do various things – from trading over the internet to performing powerful simulations for chemistry, and even engineering nanotechnology. There’s a quantum revolution going on, but it’s still a work in progress. While we can expect to develop simple quantum machines that perform specific tasks in a … Continua a leggere
The full structuration of light in the transverse plane, including intensity, phase and polarization, holds the promise of unprecedented capabilities for applications in classical optics as well as in quantum optics and information sciences. Harnessing special topologies can lead to enhanced focusing, data multiplexing or advanced sensing and metrology. Here we experimentally demonstrate the storage … Continua a leggere
Boson sampling is a computational task strongly believed to be hard for classical computers, but efficiently solvable by orchestrated bosonic interference in a specialized quantum computer. Current experimental schemes, however, are still insufficient for a convincing demonstration of the advantage of quantum over classical computation. A new variation of this task, scattershot boson sampling, leads … Continua a leggere