Ten-Port Unitary Optical Processor on a Silicon Photonic Chip

Tang, Rui; Tanomura, Ryota; Tanemura, Takuo; Nakano, Yoshiaki

doi:10.1021/acsphotonics.1c00419

Cited by 62 publications

(19 citation statements)

References 61 publications

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“…Other impressive works of large-scale photonic integrated circuits can be found in the literature, however they are either non-universal [37][38][39][40][41][42][43][44][45][46][47][48][49], or have unknown performance in terms of losses [50][51][52][53][54][55][56][57][58][59][60]. [36] [20] This work [35] Silica SOI Si 3 N 4 FIG.…”

Section: Discussionmentioning

confidence: 99%

20-Mode Universal Quantum Photonic Processor

Taballione¹,

Anguita²,

Goede³

et al. 2022

Preprint

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Integrated photonics is an essential technology for optical quantum computing. Universal, phasestable, reconfigurable multimode interferometers (quantum photonic processors) enable manipulation of photonic quantum states and are one of the main components of photonic quantum computers in various architectures. In this paper, we report the realization of the largest quantum photonic processor to date. The processor enables arbitrary unitary transformations on its 20 input modes with a fidelity of (F Haar = 97.4%, F Perm = 99.5%), an average optical loss of 2.9 dB/mode, and high-visibility quantum interference (V HOM = 98%). The processor is realized in Si 3 N 4 waveguides.

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Section: Discussionmentioning

confidence: 99%

20-Mode Universal Quantum Photonic Processor

Taballione¹,

Anguita²,

Goede³

et al. 2022

Preprint

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“…The device should be carefully chosen to ensure that the overall transformation X is universal. The mixing entropy of a device can be used as a measure of universality [43,44]. To realize an arbitrary U (N ) transformation, the total number of degrees of freedom must exceed N 2 [45].…”

Section: A Device Definition and Redundancymentioning

confidence: 99%

Iterative configuration of programmable unitary converter based on few layer redundant multi-plane light conversion

Taguchi¹,

Wang²,

Tanomura³

et al. 2023

Preprint

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Programmable unitary photonic devices are emerging as promising tools to implement unitary transformation for quantum information processing, machine learning, and optical communication. These devices typically use a rectangular mesh of Mach-Zehnder interferometers (MZIs), which has a clear mathematical structure and can be configured deterministically. However, this mesh architecture is sensitive to fabrication errors, and the correction techniques are still under investigation. In contrast, the multi-plane light conversion (MPLC) architecture is more robust against fabrication errors, but a deterministic method for configuring the converter has not yet been developed due to its complex mathematical structure. In this work, we propose a fast iterative configuration method for MPLC, following the mathematical review of the matrix distance and proposal of a new norm. We show through numerical simulations that adding a few redundant layers significantly improves the convergence of the MPLC architecture, making it a practical and attractive option. We also consider the effects of finite resolution and crosstalk in phase shifters in our simulations. In addition, we propose a phase-insensitive distance suited for applications using only intensity detections. Our method demonstrates orders of magnitude better accuracy and a 20-fold speed-up compared to previous approaches.

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“…For the time being, all DSP solutions rely on electronic devices, mostly because of all the commercial computing cores are electronic systems. While there are early concepts of fully optical processors [107], [108] and even plasmonic processors [109], [110], these are not likely to become a reality within 6G systems. Therefore, we focus on electronic DSP systems.…”

Section: The Digital Bottleneckmentioning

confidence: 99%

TeraHertz Band Communication: An Old Problem Revisited and Research Directions for the Next Decade

Akyildiz¹,

Han²,

Hu³

et al. 2021

Preprint

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TeraHertz (THz) band communications are envisioned as a key technology for 6G and Beyond. As a fundamental wireless infrastructure, THz communication can boost abundant promising applications. In 2014, our team published two comprehensive roadmaps for the development and progress of THz communication networks [1], [2], which helped the research community to start research on this subject afterwards. In particular, this topic became very important and appealing to the research community due to 6G wireless systems design and development in recent years. Many papers are getting published covering different aspects of wireless systems using the THz band. With this paper, our aim is looking back to the last decade and revisiting the old problems and pointing out what has been achieved in the research community so far. Furthermore, in this paper still to be investigated new research challenges for the THz band communication systems are presented by covering diverse subtopics such as from perspectives of devices, channel behavior, communication and networking problems, physical testbeds and demonstration systems. The key aspects presented in this paper will enable THz communications as a pillar of 6G and Beyond wireless systems in the next decade.

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Ten-Port Unitary Optical Processor on a Silicon Photonic Chip

Cited by 62 publications

References 61 publications

20-Mode Universal Quantum Photonic Processor

20-Mode Universal Quantum Photonic Processor

Iterative configuration of programmable unitary converter based on few layer redundant multi-plane light conversion

TeraHertz Band Communication: An Old Problem Revisited and Research Directions for the Next Decade

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