Silicon photonic processor of two-qubit entangling quantum logic

Santagati, R. et al. (2017) Silicon photonic processor of two-qubit entangling quantum logic. Journal of Optics, 19(11), 114006. (doi: 10.1088/2040-8986/aa8d56)

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Entanglement is a fundamental property of quantum mechanics, and is a primary resource in quantum information systems. Its manipulation remains a central challenge in the development of quantum technology. In this work, we demonstrate a device which can generate, manipulate, and analyse two-qubit entangled states, using miniature and mass-manufacturable silicon photonics. By combining four photon-pair sources with a reconfigurable six-mode interferometer, embedding a switchable entangling gate, we generate two-qubit entangled states, manipulate their entanglement, and analyse them, all in the same silicon chip. Using quantum state tomography, we show how our source can produce a range of entangled and separable states, and how our switchable controlled-Z gate operates on them, entangling them or making them separable depending on its configuration.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Sorel, Professor Marc and Hadfield, Professor Robert and Natarajan, Dr Chandra and Strain, Dr Michael and Tanner, Dr Michael
Authors: Santagati, R., Silverstone, J.W., Strain, M.J., Sorel, M., Miki, S., Yamashita, T., Fujiwara, M., Sasaki, M., Terai, H., Tanner, M.G., Natarajan, C.M., Hadfield, R.H., O'Brien, J.L., and Thompson, M.G.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Optics
Publisher:Institute of Physics Publishing Ltd.
ISSN (Online):2040-8986
Published Online:18 September 2017
Copyright Holders:Copyright © 2017 IOP Publishing
First Published:First published in Journal of Optics 19(11):114006
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
645961Integrated Photonic Quantum technologiesRobert HadfieldEngineering and Physical Sciences Research Council (EPSRC)EP/L024020/1ENG - ENGINEERING ELECTRONICS & NANO ENG