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Proceedings Paper

Quantum state generation via integrated frequency combs (Conference Presentation)
Author(s): Piotr Roztocki; Michael Kues; Christian Reimer; Benjamin Wetzel; Fabio Grazioso; Brent E. Little; Sai T. Chu; Tudor Wyatt Johnston; Yaron Bromberg; Lucia Caspani; David J. Moss; Roberto Morandotti

Paper Abstract

The on-chip generation of optical quantum states will enable accessible advances for quantum technologies. We demonstrate that integrated quantum frequency combs (based on high-Q microring resonators made from a CMOS-compatible, high refractive-index doped-glass platform) can enable the generation of pure heralded single photons, cross-polarized photon pairs, as well as bi- and multi-photon entangled qubit states over a broad frequency comb covering the S, C, L telecommunications band, with photon frequencies corresponding to standard telecommunication channels spaced by 200 GHz. Exploiting a self-locked, intra-cavity excitation configuration, a highly-stable source of multiplexed heralded single photons is demonstrated, operating continuously for several weeks with less than 5% fluctuations. The photon bandwidth of 110 MHz is compatible with quantum memories, and high photon purity was confirmed through single-photon auto-correlation measurements. In turn, by simultaneously exciting two orthogonal polarization mode resonances, we demonstrate the first realization of type-II spontaneous FWM (in analogy to type-II spontaneous parametric down-conversion), allowing the direct generation of orthogonally-polarized photon pairs on a chip. By using a double-pulse excitation, we demonstrate the generation of time-bin entangled photon pairs. We measure qubit entanglement with visibilities above 90%, enabling the implementation of quantum information processing protocols. Finally, the excitation field and the generated photons are intrinsically bandwidth-matched due to the resonant characteristics of the ring cavity, enabling the multiplication of Bell states and the generation of a four-photon time-bin entangled state. We confirm the generation of this four-photon entangled state through four-photon quantum interference.

Paper Details

Date Published: 28 April 2017
PDF: 1 pages
Proc. SPIE 10107, Smart Photonic and Optoelectronic Integrated Circuits XIX, 101070N (28 April 2017); doi: 10.1117/12.2263222
Show Author Affiliations
Piotr Roztocki, Institut National de la Recherche Scientifique (Canada)
Michael Kues, Institut National de la Recherche Scientifique (Canada)
Christian Reimer, Institut National de la Recherche Scientifique (Canada)
Benjamin Wetzel, Institut National de la Recherche Scientifique (Canada)
Univ.of Sussex (United Kingdom)
Fabio Grazioso, Institut National de la Recherche Scientifique (Canada)
Brent E. Little, Xi’an Institute of Optics and Precision Mechanics, CAS (China)
Sai T. Chu, City Univ. of Hong Kong (Hong Kong, China)
Tudor Wyatt Johnston, Institut National de la Recherche Scientifique (Canada)
Yaron Bromberg, Yale Univ. (United States)
Lucia Caspani, Institut National de la Recherche Scientifique (Canada)
Heriot-Watt Univ. (United Kingdom)
David J. Moss, Swinburne Univ. of Technology (Australia)
Roberto Morandotti, Institut National de la Recherche Scientifique (Canada)
Univ. of Electronic Science and Technology of China (China)

Published in SPIE Proceedings Vol. 10107:
Smart Photonic and Optoelectronic Integrated Circuits XIX
Louay A. Eldada; El-Hang Lee; Sailing He, Editor(s)

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