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6 September 2019 Investigation of directional and directionally-unbiased devices in linear optics for quantum walk applications
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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.
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Shuto Osawa, David S. Simon, and Alexander V. Sergienko "Investigation of directional and directionally-unbiased devices in linear optics for quantum walk applications", Proc. SPIE 11134, Quantum Communications and Quantum Imaging XVII, 111340C (6 September 2019); https://doi.org/10.1117/12.2527915
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