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)
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Abstract
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 |
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Status: | Published |
Refereed: | Yes |
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: | 2040-8978 |
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 |
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