Proposed optical realisation of a two photon, four-qubit entangled χ state

Ritboon, A., Croke, S. and Barnett, S. (2017) Proposed optical realisation of a two photon, four-qubit entangled χ state. Journal of Optics, 19(7), 075201. (doi: 10.1088/2040-8986/aa72af)

141870.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.



The four-qubit states |χij, exhibiting genuinely multi-partite entanglement have been shown to have many interesting properties and have been suggested for novel applications in quantum information processing. In this work we propose a simple quantum circuit and its corresponding optical embodiment with which to prepare photon pairs in the |χij states. Our approach uses hyper-entangled photon pairs, produced by the type-I spontaneous parametric down-conversion (SPDC) process in two contiguous nonlinear crystals, together with a set of simple linear-optical transformations. Our photon pairs are maximally hyper-entangled in both their polarisation and orbital angular momentum (OAM). After one of these daughter photons passes through our optical setup, we obtain photon pairs in the hyper-entangled state |χ00, and the |χij states can be achieved by further simple transformations.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Barnett, Professor Stephen and Croke, Dr Sarah and Ritboon, Atirach
Authors: Ritboon, A., Croke, S., and Barnett, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Optics
Publisher:IOP Publishing
ISSN (Online):2040-8986
Published Online:12 May 2017
Copyright Holders:Copyright © 2017 IOP Publishing Ltd
First Published:First published in Journal of Optics 19(7): 075201
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
721291Astronomy and physics, theoretical physics and application physics / Quantum Theory. Royal Society Research Professorship.Stephen BarnettThe Royal Society (ROYSOC)RP150122S&E P&A - PHYSICS & ASTRONOMY