High-dimensional one-way quantum processing implemented on d-level cluster states

Reimer, C. et al. (2019) High-dimensional one-way quantum processing implemented on d-level cluster states. Nature Physics, 15(2), pp. 148-153. (doi: 10.1038/s41567-018-0347-x)

Abstract

Taking advantage of quantum mechanics for executing computational tasks faster than classical computers1 or performing measurements with precision exceeding the classical limit2,3 requires the generation of specific large and complex quantum states. In this context, cluster states4 are particularly interesting because they can enable the realization of universal quantum computers by means of a ‘one-way’ scheme5, where processing is performed through measurements6. The generation of cluster states based on sub-systems that have more than two dimensions, d-level cluster states, provides increased quantum resources while keeping the number of parties constant7, and also enables novel algorithms8. Here, we experimentally realize, characterize and test the noise sensitivity of three-level, four-partite cluster states formed by two photons in the time9 and frequency10 domain, confirming genuine multi-partite entanglement with higher noise robustness compared to conventional two-level cluster states6,11,12,13. We perform proof-of-concept high-dimensional one-way quantum operations, where the cluster states are transformed into orthogonal, maximally entangled d-level two-partite states by means of projection measurements. Our scalable approach is based on integrated photonic chips9,10 and optical fibre communication components, thus achieving new and deterministic functionalities.

• Item Type: Articles (Letter)
• Additional Information: This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Steacie, Strategic, Discovery and Acceleration Grants Schemes, by the MESI PSR-SIIRI Initiative in Quebec, by the Canada Research Chair Program and by the Australian Research Council Discovery Projects scheme (DP150104327). C.R., P.R. and S.L. acknowledge the support of NSERC Vanier Canada Graduate Scholarships. M.K. acknowledges funding from the European Union’s Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie grant agreement number 656607. S.T.C. acknowledges support from the CityU APRC programme number 9610356. B.E.L. acknowledges support from the Strategic Priority Research Program of the Chinese Academy of Sciences (grant number XDB24030300). W.J.M. acknowledges support from the John Templeton Foundation (JTF) number 60478. R.M. acknowledges additional support by the Government of the Russian Federation through the ITMO Fellowship and Professorship Program (grant 074-U 01) and from the 1000 Talents Sichuan Program.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kues, Dr Michael
• Authors: Reimer, C., Sciara, S., Roztocki, P., Islam, M., Romero Cortés, L., Zhang, Y., Fischer, B., Loranger, S., Kashyap, R., Cino, A., Chu, S. T., Little, B. E., Moss, D. J., Caspani, L., Munro, W. J., Azaña, J., Kues, M., and Morandotti, R.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Nature Physics
• Publisher: Nature Publishing Group
• ISSN: 1745-2473
• ISSN (Online): 1745-2481
• Published Online: 03 December 2018
• Copyright Holders: Copyright © 2019 Springer Nature Limited
• First Published: First published in Nature Physics 15(2):148-153
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher