Demonstration of chip-based coupled degenerate optical parametric oscillators for realizing a nanophotonic spin-glass

Yoshitomo Okawachi, Mengjie Yu, Jae K. Jang, Xingchen Ji, Yun Zhao, Bok Young Kim, Michal Lipson and Alexander L. Gaeta ()
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Yoshitomo Okawachi: Columbia University
Mengjie Yu: Columbia University
Jae K. Jang: Columbia University
Xingchen Ji: Columbia University
Yun Zhao: Columbia University
Bok Young Kim: Columbia University
Michal Lipson: Columbia University
Alexander L. Gaeta: Columbia University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The need for solving optimization problems is prevalent in various physical applications, including neuroscience, network design, biological systems, socio-economics, and chemical reactions. Many of these are classified as non-deterministic polynomial-time hard and thus become intractable to solve as the system scales to a large number of elements. Recent research advances in photonics have sparked interest in using a network of coupled degenerate optical parametric oscillators (DOPOs) to effectively find the ground state of the Ising Hamiltonian, which can be used to solve other combinatorial optimization problems through polynomial-time mapping. Here, using the nanophotonic silicon-nitride platform, we demonstrate a spatial-multiplexed DOPO system using continuous-wave pumping. We experimentally demonstrate the generation and coupling of two microresonator-based DOPOs on a single chip. Through a reconfigurable phase link, we achieve both in-phase and out-of-phase operation, which can be deterministically achieved at a fast regeneration speed of 400 kHz with a large phase tolerance.

Date: 2020
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DOI: 10.1038/s41467-020-17919-6

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