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Single-photon storage in laser written waveguides fabricated in rare-earth-doped solids (Conference Presentation)
Author(s): Giacomo Corrielli; Alessandro Seri; Dario Lago; Andreas Lenhard; Hugues de Riedmatten; Roberto Osellame; Margherita Mazzera
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Paper Abstract

Efficient and long-lived multimode quantum memories are crucial devices in the development of quantum technolgies. The reversible mapping of quantum states of light in rare earth doped crystals represents one of the most promising routes towards the realization of this goal. Such systems are also compatible with the miniaturization of quantum memories in integrated optics platforms, which offer unique features in terms of experimental scalability and enhanced light-matter interaction. Here, we fabricate single mode channel waveguides for 606 nm light in a praseodymium-doped yttrium orthosilicate crystal (Pr3+:Y2SiO5), that, thanks to its excellent coherence properties, is a widely studied material for light storage experiments. Waveguides are inscribed by femtosecond laser writing, adopting the so-called Type I configuration, where the core is directly obtained at the irradiated area. Remarkably, fabricating this kind of waveguides in crystals is a difficult task, as it requires to operate in a very narrow processing parameters window, if existing. We then use these waveguides for performing the storage and retrieval of single photons, implementing the atomic frequency comb protocol. We achieve a storage time of 5,5 µs, which is almost 2 orders of magnitude longer than previous realizations of quantum light storage in a waveguide. In addition, we investigate the potential information multiplexing capabilities of our system by performing the quantum storage of single photons delocalized over 14 different spectral modes. Our results show that laser written waveguides in rare earth-doped solid state systems are very promising for the development of efficient and long-lived multimode quantum memories.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10933, Advances in Photonics of Quantum Computing, Memory, and Communication XII, 109330R (4 March 2019); doi: 10.1117/12.2508762
Show Author Affiliations
Giacomo Corrielli, Istituto di Fotonica e Nanotecnologie (Italy)
Alessandro Seri, ICFO - Institut de Ciències Fotòniques (Spain)
Dario Lago, ICFO - Institut de Ciències Fotòniques (Spain)
Andreas Lenhard, ICFO - Institut de Ciències Fotòniques (Spain)
Hugues de Riedmatten, ICFO - Institut de Ciències Fotòniques (Spain)
Roberto Osellame, Istituto di Fotonica e Nanotecnologie (Italy)
Margherita Mazzera, ICFO - Institut de Ciències Fotòniques (Spain)

Published in SPIE Proceedings Vol. 10933:
Advances in Photonics of Quantum Computing, Memory, and Communication XII
Philip R. Hemmer; Alan L. Migdall; Zameer Ul Hasan, Editor(s)

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