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Topologically Protected All-Optical Memory

Cited 3 time in Web of Science Cited 3 time in Scopus
Authors

Choi, Seou; Kim, Jungmin; Kwak, Jeonghun; Park, Namkyoo; Yu, Sunkyu

Issue Date
2022-10
Publisher
Wiley-VCH Verlag
Citation
Advanced Electronic Materials, Vol.8 No.10, p. 2200579
Abstract
The in-memory processor has played an essential role in overcoming the von Neumann bottleneck, which arises from the partition of memory and a processing unit. Although photonic technologies have recently attracted attention for ultrafast and power-efficient in-memory computing, the realization of an all-optical in-memory processor remains a challenge. This difficulty originates from the contradiction between robustness and sensitivity in wave dynamics, requiring both noise-immune memory states and modulation-sensitive transitions between these states. Here, a building block that provides an all-optical transition between topologically protected memory states is proposed. A nonlinear photonic molecule that satisfies parity-time (PT) symmetry, revealing multiple oscillation quenching states with different degeneracies determined by PT-symmetric phases is investigated. In terms of topology for dynamical systems, these quenching states support topologically protected dynamical trajectories suitable for stable memory states. An all-optical bidirectional transition between these states, which allows incoherent memory switching is demonstrated. The result provides design criteria for all-optical in-memory processors with multilevel operations, enabling the classical-wave counterpart of electronic memristors.
ISSN
2199-160X
URI
https://hdl.handle.net/10371/202187
DOI
https://doi.org/10.1002/aelm.202200579
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  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area Disordered, Open-System Wave Mechanics, Photonic AI Systems, Photonic Neuromorphic Devices, 광학 뉴로모픽 소자, 광학 인공지능 시스템, 무질서, 열린계 파동역학

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