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Integrated generation of complex optical quantum states and their coherent control
Author(s): Piotr Roztocki; Michael Kues; Christian Reimer; Luis Romero Cortés; Stefania Sciara; Benjamin Wetzel; Yanbing Zhang; Alfonso Cino; Sai T. Chu; Brent E. Little; David J. Moss; Lucia Caspani; José Azaña; Roberto Morandotti
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Paper Abstract

Complex optical quantum states based on entangled photons are essential for investigations of fundamental physics and are the heart of applications in quantum information science. Recently, integrated photonics has become a leading platform for the compact, cost-efficient, and stable generation and processing of optical quantum states. However, onchip sources are currently limited to basic two-dimensional (qubit) two-photon states, whereas scaling the state complexity requires access to states composed of several (<2) photons and/or exhibiting high photon dimensionality. Here we show that the use of integrated frequency combs (on-chip light sources with a broad spectrum of evenly-spaced frequency modes) based on high-Q nonlinear microring resonators can provide solutions for such scalable complex quantum state sources. In particular, by using spontaneous four-wave mixing within the resonators, we demonstrate the generation of bi- and multi-photon entangled qubit states over a broad comb of channels spanning the S, C, and L telecommunications bands, and control these states coherently to perform quantum interference measurements and state tomography. Furthermore, we demonstrate the on-chip generation of entangled high-dimensional (quDit) states, where the photons are created in a coherent superposition of multiple pure frequency modes. Specifically, we confirm the realization of a quantum system with at least one hundred dimensions. Moreover, using off-the-shelf telecommunications components, we introduce a platform for the coherent manipulation and control of frequencyentangled quDit states. Our results suggest that microcavity-based entangled photon state generation and the coherent control of states using accessible telecommunications infrastructure introduce a powerful and scalable platform for quantum information science.

Paper Details

Date Published: 2 January 2018
PDF: 5 pages
Proc. SPIE 10456, Nanophotonics Australasia 2017, 104561A (2 January 2018); doi: 10.1117/12.2286435
Show Author Affiliations
Piotr Roztocki, INRS-EMT (Canada)
Michael Kues, INRS-EMT (Canada)
Univ. of Glasgow (United Kingdom)
Christian Reimer, INRS-EMT (Canada)
Luis Romero Cortés, INRS-EMT (Canada)
Stefania Sciara, INRS-EMT (Canada)
Univ. of Palermo (Italy)
Benjamin Wetzel, INRS-EMT (Canada)
Univ. of Sussex (United Kingdom)
Yanbing Zhang, INRS-EMT (Canada)
Alfonso Cino, Univ. of Palermo (Italy)
Sai T. Chu, City Univ. of Hong Kong (Hong Kong, China)
Brent E. Little, Xi’an Institute of Optics and Precision Mechanics (China)
David J. Moss, Swinburne Univ. of Technology (Australia)
Lucia Caspani, Univ. of Strathclyde (United Kingdom)
Heriot-Watt Univ. (United Kingdom)
José Azaña, INRS-EMT (Canada)
Roberto Morandotti, INRS-EMT (Canada)
Univ. of Electronic Science and Technology of China (China)
National Research Univ. of Information Technologies (Russian Federation)


Published in SPIE Proceedings Vol. 10456:
Nanophotonics Australasia 2017
James W. M. Chon; Baohua Jia, Editor(s)

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