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Proceedings Paper

Investigation of directional and directionally-unbiased devices in linear optics for quantum walk applications
Author(s): Shuto Osawa; David S. Simon; Alexander V. Sergienko
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Paper Abstract

The optical beam splitter is one of the main building blocks in photonics-based quantum information processing. Traditionally, beam splitters are used in feed-forward configurations that reflect their natural directional-bias, meaning a photon cannot leave the scattering element through the entrance port. However, this directional-bias constraint can be circumvented by designing new linear-optical configurations that include mirrors in addition to the beam splitter. This directionality removal restores a full symmetry in the scattering element and allows the input photon to leave the system also from the input port. Such a system can be seen as a scattering center, enabling execution of quantum walks on rather complex optical graph networks with great savings in hardware resources when compared with existing approaches utilizing directionally-biased devices. The directionallyunbiased configuration can be realized using different optical systems. Analysis of some originally directional optical devices and the basic principles of their conversion into directionally-unbiased systems form the base of this paper. Several quantum walk procedures executed on graph networks constructed using directionallyunbiased nodes are discussed.

Paper Details

Date Published: 6 September 2019
PDF: 19 pages
Proc. SPIE 11134, Quantum Communications and Quantum Imaging XVII, 111340C (6 September 2019); doi: 10.1117/12.2527915
Show Author Affiliations
Shuto Osawa, Boston Univ. (United States)
David S. Simon, Boston Univ. (United States)
Stonehill College (United States)
Alexander V. Sergienko, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 11134:
Quantum Communications and Quantum Imaging XVII
Keith S. Deacon, Editor(s)

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