Integrated generation of complex optical quantum states and their coherent control

Roztocki, P. et al. (2018) Integrated generation of complex optical quantum states and their coherent control. In: SPIE Nanophotonics Australasia, 2017, Melbourne, Australia, 10-13 December 2017, 104561A. (doi: 10.1117/12.2286435)

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.

• Item Type: Conference Proceedings
• Additional Information: Proceedings of SPIE Volume 10456
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kues, Dr Michael
• Authors: Roztocki, P., Kues, M., Reimer, C., Romero Cortés, L., Sciara, S., Wetzel, B., Zhang, Y., Cino, A., Chu, S. T., Little, B., Moss, D., Caspani, L., Azaña, J., and Morandotti, R.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Proceedings of the SPIE: The International Society for Optical Engineering
• Publisher: SPIE - The International Society for Optical Engineering
• ISSN: 0277-786X
• ISSN (Online): 1996-756X
• Copyright Holders: Copyright © 2018 SPIE
• First Published: First published in Proceedings of the SPIE: The International Society for Optical Engineering 10456:104561A
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher