Picture of person typing on laptop with programming code visible on the laptop screen

World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

Explore

Entanglement of arbitrary superpositions of modes within two-dimensional orbital angular momentum state spaces

Jack, B. and Yao, A. M. and Leach, J. and Romero, J. and Franke-Arnold, S. and Ireland, D. G. and Barnett, S. M. and Padgett, M. J. (2010) Entanglement of arbitrary superpositions of modes within two-dimensional orbital angular momentum state spaces. Physical Review A, 81 (4). ISSN 1094-1622

[img]
Preview
PDF
EntangArbSup.pdf - Preprint

Download (528kB) | Preview

Abstract

We use spatial light modulators (SLMs) to measure correlations between arbitrary superpositions of orbital angular momentum (OAM) states generated by spontaneous parametric down-conversion. Our technique allows us to fully access a two-dimensional OAM subspace described by a Bloch sphere, within the higher-dimensional OAM Hilbert space. We quantify the entanglement through violations of a Bell-type inequality for pairs of modal superpositions that lie on equatorial, polar, and arbitrary great circles of the Bloch sphere. Our work shows that SLMs can be used to measure arbitrary spatial states with a fidelity sufficient for appropriate quantum information processing systems.