Considerations for the extension of coherent optical processors into the quantum computing regime

Young, Rupert C D, Birch, Philip M and Chatwin, Chris R (2016) Considerations for the extension of coherent optical processors into the quantum computing regime. Proceedings of SPIE, 9845. pp. 1-9. ISSN 0277-786X

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Abstract

Previously we have examined the similarities of the quantum Fourier transform to the classical coherent optical implementation of the Fourier transform (R. Young et al, Proc SPIE Vol 87480, 874806-1, -11). In this paper, we further consider how superposition states can be generated on coherent optical wave fronts, potentially allowing coherent optical processing hardware architectures to be extended into the quantum computing regime. In particular, we propose placing the pixels of a Spatial Light Modulator (SLM) individually in a binary superposition state and illuminating them with a coherent wave front from a conventional (but low intensity) laser source in order to make a so-called ‘interaction free’ measurement. In this way, the quantum object, i.e. the individual pixels of the SLM in their superposition states, and the illuminating wavefront would become entangled. We show that if this were possible, it would allow the extension of coherent processing architectures into the quantum computing regime and we give an example of such a processor configured to recover one of a known set of images encrypted using the well-known coherent optical processing technique of employing a random Fourier plane phase encryption mask which classically requires knowledge of the corresponding phase conjugate key to decrypt the image. A quantum optical computer would allow interrogation of all possible phase masks in parallel and so immediate decryption.

Item Type: Article
Keywords: Coherent optical processing, Optical quantum computing, Superposition states, Multiple photon states, Interaction free measurements, Coherent optical Fourier transform, Spatial light modulators
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: Q Science > QA Mathematics > QA0075 Electronic computers. Computer science
Q Science > QC Physics > QC0350 Optics. Light
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics > TK7885 Computer engineering. Computer hardware
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics > TK8300 Photoelectronic devices (General)
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Depositing User: Chris Chatwin
Date Deposited: 06 May 2016 14:32
Last Modified: 07 Mar 2017 12:57
URI: http://sro.sussex.ac.uk/id/eprint/60802

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