Reconfigurable continuously-coupled 3D photonic circuit for Boson Sampling experiments

Hoch, Francesco; Piacentini, Simone; Giordani, Taira; Tian, Zhen‐Nan; Iuliano, Mariagrazia; Esposito, Chiara; Camillini, Anita; Carvacho, Gonzalo; Ceccarelli, Francesco; Spagnolo, Nicolò; Crespi, Andrea; Sciarrino, Fabio; Osellame, Roberto

doi:10.1038/s41534-022-00568-6

Cited by 20 publications

(22 citation statements)

References 73 publications

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“…This technique exploits the non-linear interaction of focused femtosecond laser pulses with a transparent dielectric material to induce a permanent change in the refractive index localized in the focal volume, allowing the fabrication of waveguides by translating the sample underneath the pulsed laser. Femtosecond-laser-written waveguides in glass substrates show low optical losses (less than

dB/cm in the visible and near-infrared [ 17 ]), have low birefringence (as low as

[ 18 ], making them compatible with polarization-encoded protocols), and can be easily exploited for the fabrication of complex structures in a three-dimensional fashion [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Toward Higher Integration Density in Femtosecond-Laser-Written Programmable Photonic Circuits

et al. 2022

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Programmability in femtosecond-laser-written integrated circuits is commonly achieved with the implementation of thermal phase shifters. Recent work has shown how such phase shifters display significantly reduced power dissipation and thermal crosstalk with the implementation of thermal isolation structures. However, the aforementioned phase shifter technology is based on a single gold film, which poses severe limitations on integration density and circuit complexity due to intrinsic geometrical constraints. To increase the compactness, we propose two improvements to this technology. Firstly, we fabricated thermal phase shifters with a photolithography process based on two different metal films, namely (1) chromium for microheaters and (2) copper for contact pads and interconnections. Secondly, we developed a novel curved isolation trench design that, along with a state-of-the-art curvature radius, allows for a significant reduction in the optical length of integrated circuits. As a result, curved Cr-Cu phase shifters provide a compact footprint with low parasitic series resistance and no significant increase in power dissipation (∼38 mW) and thermal crosstalk (∼20%). These results pave the way toward the fabrication of femtosecond-laser-written photonic circuits with a steep increase in terms of layout complexity.

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dB/cm in the visible and near-infrared [ 17 ]), have low birefringence (as low as

[ 18 ], making them compatible with polarization-encoded protocols), and can be easily exploited for the fabrication of complex structures in a three-dimensional fashion [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Toward Higher Integration Density in Femtosecond-Laser-Written Programmable Photonic Circuits

et al. 2022

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“…Also important are heterogeneous integration techniques that enable compact footprints for computing cores involving active (ie., gain media or light sources), photodetectors, modulators and passive computing cores (such as MZI arrays) [169][170][171]. Finally, multi-layer photonic circuits exploiting the vertical dimension of integration, other than planar circuits [172] can also be exploited.…”

Section: Discussionmentioning

confidence: 99%

Photonic Multiplexing Techniques for Optical Neuromorphic Computing

Moss¹

2022

Preprint

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The simultaneous advances in artificial neural networks and photonic integration technologies have spurred extensive research in optical computing and optical neural networks (ONNs). The potential to simultaneously exploit multiple physical dimensions of time, wavelength and space give ONNs the ability to achieve computing operations with high parallelism and large-data throughput. Different photonic multiplexing techniques based on these multiple degrees of freedom have enabled ONNs with large-scale interconnectivity and linear computing functions. Here, we review the recent advances of ONNs based on different approaches to photonic multiplexing, and present our outlook on key technologies needed to further advance these photonic multiplexing/hybrid-multiplexing techniques of ONNs.

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Section: Integrated Photonic Platformmentioning

confidence: 99%

Integrated Photonic Computing beyond the von Neumann Architecture

Jin

2023

ACS Photonics

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In the context of a doomed end of the Moore's law, various new types of computing architectures have been emerging, aiming to meet the demands of intractable computation and artificial intelligence. Photonic computing is a competitive candidate, in light of the inherent properties of photons, including high propagation speed, strong robustness, and multiple degrees of freedom to encode information. Also, the progress of integrated photonics continues to provide novel possibilities, apart from boosting the scalability and stability of photonic computing architectures. Moreover, an introduction of quantum technology might open a new chapter for photonic computing, from the view of single photons. In this Perspective, we highlight the unique features and advances of integrated photonic platforms, whose roles in constructing a non-von Neumann computing architecture are also outlined. We show their potential in solving problems beyond the reach of traditional computers and in machine learning and further discuss the conceivable challenges and opportunities.

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Reconfigurable continuously-coupled 3D photonic circuit for Boson Sampling experiments

Cited by 20 publications

References 73 publications

Toward Higher Integration Density in Femtosecond-Laser-Written Programmable Photonic Circuits

Toward Higher Integration Density in Femtosecond-Laser-Written Programmable Photonic Circuits

Photonic Multiplexing Techniques for Optical Neuromorphic Computing

Integrated Photonic Computing beyond the von Neumann Architecture

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