Optical Fiber Communication Conference

On-Chip Universal Linear Optics using a 4x4 Silicon Photonic Coherent Crossbar

George Giamougiannis, Miltiadis Moralis‐Pegios, Apostolos Tsakyridis, Nikos Bamiedakis, David Lazovsky, Nikos Pleros

Published Jan 1, 2023• 2 citations

Abstract

We demonstrate the first on-chip and fidelity-restorable universal linear optical circuit that relies on a novel 4×4 silicon photonic coherent crossbar architecture. Its experimental characterization yields a fidelity of 99.93±0.06%, calculated over 10,000 arbitrary matrices.

DOI: 10.1364/ofc.2023.tu3b.3

Related papers

On-Chip Universal Linear Optics using a 4x4 Silicon Photonic Coherent Crossbar

George Giamougiannis, Miltiadis Moralis‐Pegios, Apostolos Tsakyridis +3 more

Optical Fiber Communication ConferenceMar 1, 20231 citation

Perfect linear optics using silicon photonics

Miltiadis Moralis‐Pegios, George Giamougiannis, Apostolos Tsakyridis +2 more

Recently there has been growing interest in using photonics to perform the linear algebra operations of neuromorphic and quantum computing applications, aiming at harnessing silicon photonics' (SiPho) high-speed and energy-efficiency credentials. Accurately mapping, however, a matrix into optics remains challenging, since state-of-the-art optical architectures are sensitive to fabrication imperfections. This leads to reduced fidelity that degrades as the insertion losses of the optical matrix nodes or the matrix dimensions increase. In this work, we present the experimental deployment of a 4 × 4 coherent crossbar (Xbar) as a silicon chip and validate experimentally its theoretically predicted fidelity restoration credentials. We demonstrate the experimental implementation of 10,000 arbitrary linear transformations achieving a record-high fidelity of 99.997% ± 0.002, limited mainly by the measurement equipment. Our work represents an integrated optical circuit providing almost unity and loss-independent fidelity in the realization of arbitrary matrices, highlighting light's credentials in resolving complex computations.

arXiv:2306.17728Nature CommunicationsJun 27, 202443 citations

A Coherent Photonic Crossbar for Scalable Universal Linear Optics

George Giamougiannis, Apostolos Tsakyridis, Yangjin Ma +4 more

We demonstrate a novel interferometric coherent photonic crossbar architecture (Xbar) that can realize any tensor operator and allows for total loss-induced fidelity restoration, offering at the same time significant dimension scalability credentials compared to respective state-of-the-art solutions. The proposed Xbar layout demarcates from the prevalent photonic schemes that rely on the implementation of intended matrices factorized via the Singular Value Decomposition (SVD); instead, it harnesses the power of interference within a novel design where each matrix element can be mapped by one-to-one correspondence to a single, designated Xbar node, bringing down the number of programming steps to only one. In this paper, we present the theoretical foundations of the Xbar, proving that its insertion losses do not scale with the node losses as opposed to the exponential scaling witnessed by the SVD based counterparts. This leads to a matrix design with significantly lower overall insertion losses and improved scalability potential compared to SVD-based schemes, allowing for the employment of alternative node technologies with lower energy consumption and higher operational speed credentials. Finally, we theoretically validate that the proposed Xbar architecture is the first linear operator that supports fidelity restoration, outperforming SVD schemes in loss- and phase-error fidelity performance.

arXiv:2208.12033Journal of Lightwave TechnologyJan 6, 202360 citations

Design and Implementation of a 6x6 MZI-Based Coherent Crossbar Array for Scalable Photonic Matrix Computation

José Roberto Rausell‐Campo, J. Capmany

We demonstrate an on-chip 6x6 MZI-based coherent crossbar architecture and provide a calibration algorithm based on the creation of interferometric structures. Experimental results over 5000 matrices show a fidelity of 99.47±0.14%.

Jan 1, 20250 citations

High-Fidelity Positive Real Matrix Transformation with Coherent Integrated Photonics Chip

Guangsong Yuan, Hongxiang Guo, Yuepeng Wu +3 more

We implement random 3x3 positive real matrix transformation with a 4x4 coherent integrated photonics chip. Experiments show the similarity results for random single or two parallel matrices are 95.2% and 93.5%, respectively.

Asia Communications and Photonics ConferenceNov 4, 20230 citations

Modular linear optical circuits

Paolo L. Mennea, William R. Clements, Devin H. Smith +8 more

We propose and demonstrate a modular architecture for reconfigurable on-chip linear-optical circuits. Each module contains 10 independent phase-controlled Mach-Zehnder interferometers; several such modules can be connected to each other to build large reconfigurable interferometers. With this architecture, large interferometers are easier to build and characterize than with traditional, bespoke, monolithic designs. We demonstrate our approach by fabricating three modules in the form of UV-written silica-on-silicon chips. We characterize these chips, connect them to each other, and implement a wide range of linear optical transformations. We envisage that this architecture will enable many future experiments in quantum optics.

arXiv:1803.04539OpticaAug 30, 201856 citations