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Updated: Jun 12, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Outer product processor using polarization encoding
Abstract:
An architecture capable of performing the outer product operation followed by a weighting of the resultant elements is presented in this paper. By using a polarization encoding technique, the spatial capacity is increased by a factor of four over implementations using other techniques. The use of space-integrating photodiodes as detectors permits the evaluation of second-order polynomials. Spatial multiplexing allows the architecture greater versatility in performing a large number of operations in parallel. The primary application discussed here using this architecture is a quadratic neural network.
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Encoding
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...