Programmable photonic unitary circuits for light computing
Kyuho Kim, Kunwoo Park, Hyungchul Park, Sunkyu Yu, Namkyoo Park,, Xianji Piao

TL;DR
This paper reviews the design principles and recent advancements in programmable photonic unitary circuits, emphasizing integrated platforms, different design strategies, and approaches to scalability for light-based computing and quantum applications.
Contribution
It provides a comprehensive classification and analysis of various design strategies for programmable photonic unitary circuits, highlighting recent progress and scalability solutions.
Findings
Classification of design strategies based on unitary operation dimensionality
Discussion of physical axes like temporal and frequency domains for scalability
Analysis of trade-offs in different photonic circuit implementations
Abstract
Unitarity serves as a fundamental concept for characterizing linear and conservative wave phenomena in both classical and quantum systems. Developing platforms that perform unitary operations on light waves in a uni-versal and programmable manner enables the emulation of complex light-matter interactions and the execution of general-purpose functionalities for wave manipulations, photonic computing, and quantum circuits. Recent-ly, numerous approaches to implementing programmable photonic unitary circuits have been proposed and demonstrated, each employing different design strategies that distinctly impact overall device performance. Here, we review foundational design principles and recent achievements in the implementation of programma-ble photonic unitary circuits, with a particular focus on integrated photonic platforms. We classify the design strategies based on the dimensionality…
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Taxonomy
TopicsNeural Networks and Reservoir Computing · Photonic and Optical Devices · Optical Network Technologies
