Share Email Print
cover

Proceedings Paper

Versatile integrated source of entangled photons at telecom wavelength in femtosecond-laser-written circuits (Conference Presentation)
Author(s): Simone Atzeni; Giacomo Corrielli; Andrea Crespi; Roberto Osellame; Adil Rab; Emanuele Polino; Mauro Valeri; Nicolo Spagnolo; Paolo Mataloni; Fabio Sciarrino

Paper Abstract

Entangled photons generation is an interesting field of research, since progress in this area will directly affect the development of photonic quantum technologies, including quantum computing, simulation and sensing. Several methods have been sifted to increase the performances of entangled photon sources and the integrated optics approach represents a promising strategy. In particular, integrated waveguide sources represent a robust tool, thanks to their stability and the enhancement of nonlinear light-crystal interaction provided by waveguide field confinement. Here, we show the versatility of a hybrid approach, realizing an integrated optical source for the generation of entangled photon-pairs at telecom wavelength. The nonlinear active medium used is lithium niobate, while the routing and manipulation of the generated signal is performed in aluminum-borosilicate glass photonic circuits. The system is composed of three cascaded devices. First, a balanced directional coupler at the fundamental wavelength equally splits the pump in the lithium niobate waveguides, which generate single-photon pairs through type 0 spontaneous parametric down-conversion process. A third chip, encompassing directional couplers and waveplates, closes the interferometer and recombines the generated photons, thus giving access to different quantum states of light: path-entangled or polarization-entangled states. A thermal phase shifter, which controls the relative phase between the interferometer arms, gives an additional degree of freedom for engineering the output state of the presented photon pairs source. All these components are entirely fabricated by femtosecond laser micromachining, a direct and very versatile technique that allows to process different kind of materials and realize high quality optical circuits.

Paper Details

Date Published: 14 March 2018
PDF
Proc. SPIE 10547, Advances in Photonics of Quantum Computing, Memory, and Communication XI, 105470Y (14 March 2018); doi: 10.1117/12.2290555
Show Author Affiliations
Simone Atzeni, Politecnico di Milano (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Giacomo Corrielli, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Politecnico di Milano (Italy)
Andrea Crespi, Politecnico di Milano (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Roberto Osellame, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Politecnico di Milano (Italy)
Adil Rab, Sapienza Univ. di Roma (Italy)
Emanuele Polino, Sapienza Univ. di Roma (Italy)
Mauro Valeri, Sapienza Univ. di Roma (Italy)
Nicolo Spagnolo, Sapienza Univ. di Roma (Italy)
Paolo Mataloni, Sapienza Univ. di Roma (Italy)
Fabio Sciarrino, Sapienza Univ. di Roma (Italy)


Published in SPIE Proceedings Vol. 10547:
Advances in Photonics of Quantum Computing, Memory, and Communication XI
Zameer Ul Hasan; Philip R. Hemmer; Alan E. Craig; Alan L. Migdall, Editor(s)

© SPIE. Terms of Use
Back to Top