D. Perez-Lopez, A. López-Hernandez, A. Macho, P. Das Mahapatra, J. Capmany
We review some of the basic principles, fundamentals, technologies, architectures and recent advances leading to thefor the implementation of Field Programmable Photonic Field Arrays (FPPGAs).
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The Goldilocks Principle of Learning Unitaries by Interlacing Fixed Operators with Programmable Phase Shifters on a Photonic Chip
本研究针对可编程光子集成电路实现任意酉操作的需求，提出固定中间层与可编程移相器层交错的架构及中间算子判定准则，识别出多类可用光子组件，为高效设计多用途可编程光子芯片提供支撑。
Programmable photonic circuits of reconfigurable interferometers can be used to implement arbitrary operations on optical modes, facilitating a flexible platform for accelerating tasks in quantum simulation, signal processing, and artificial intelligence. A major obstacle to scaling up these systems is static fabrication error, where small component errors within each device accrue to produce significant errors within the circuit computation. Mitigating this error usually requires numerical optimization dependent on real-time feedback from the circuit, which can greatly limit the scalability o…
Component errors limit the scaling of programmable coherent photonic circuits. These errors arise because the standard tunable photonic coupler -- the Mach-Zehnder interferometer (MZI) -- cannot be perfectly programmed to the cross state. Here, we introduce two modified circuit architectures that overcome this limitation: (1) a 3-splitter MZI mesh for generic errors, and (2) a broadband MZI+Crossing design for correlated errors. Because these designs allow for perfect realization of the cross state, the matrix fidelity no longer decreases with mesh size, allowing scaling to arbitrarily large m…
A programmable photonic memory
本文提出一种基于通用光学逻辑门的集成光子置位-复位锁存器，作为可编程硅光子芯片上的光学静态存储单元，实现光学控制的可扩展存储，提升光学处理系统的效率与延迟。
Digital electronics is a technological cornerstone in our modern society which has covered the increasing demand in computing power during the last decades thanks to a periodic doubling of transistor density and power efficiency in integrated circuits. Currently, such scaling laws are reaching their fundamental limits, leading to the emergence of a large gamut of applications that cannot be supported by digital electronics, specifically, those that involve real time analog multi-data processing, e.g., medical diagnostic imaging, robotic control and remote sensing, among others. In this scenari…
Heavy tails and pruning in programmable photonic circuits
针对大规模可编程光子电路中噪声损害保真度的问题，研究揭示旋转算子的重尾分布与枢纽移相器，提出通过剪枝冗余旋转构建高保真、高能效通用酉矩阵架构。
Programmable Photonic Extreme Learning Machines
本文提出并实验演示了一种基于六边形波导网格的可编程光子极限学习机，可在芯片上直接编程输入特征、随机隐藏层和非线性，并结合进化算法与波分复用提升精度，成功完成多个复杂分类任务。
A fully-programmable integrated photonic processor for both domain-specific and general-purpose computing
本文提出一种全可编程集成光子处理器，通过自主光电计算平台实现端到端控制，既能高效求解子集和与精确覆盖等NP完全问题，又能完成高精度点积、图像边缘检测和97%准确率的MNIST分类，显著提升光学计算的通用性与实用性。
Towards the Information-Theoretic Limit of Programmable Photonics
针对可编程光子电路移相器需$2π$调谐范围限制可扩展性的问题，研究推导了多端口干涉仪相移效率的信息论极限，提出3-MZI架构逼近该极限，实现大幅相移降低，并验证其在低相移约束下的光学神经网络训练精度无损。
Linear light processing functions (e.g., routing, splitting, filtering) are key functions requiring configuration to implement on a programmable photonic integrated circuit (PPIC). In recirculating waveguide meshes (which include loop-backs), this is usually done manually. Some previous results describe explorations to perform this task automatically, but their efficiency or applicability is still limited. In this paper, we propose an efficient method that can automatically realize configurations for many light processing functions on a square-mesh PPIC. At its heart is an automatic differenti…
Software-defined optical networking applications enabled by programmable integrated photonics
针对数据中心网络增长需求，本研究基于可编程集成光子处理器，结合图论实现多种软件定义光网络应用，在串扰和重配置速度上表现优异，为高性能光子器件发展奠定基础。
Auto-calibrating Universal Programmable Photonic Circuits: Hardware Error-Correction and Defect Resilience
该研究验证了基于相移层与DFrFT交错的通用光子电路架构，在中间操作扰动、每层最多1个故障移相器的情况下仍保持通用性与缺陷韧性，可实现制造后自动校准以补偿相位元件误差缺陷。
Thermal Crosstalk Modelling and Compensation Methods for Programmable Photonic Integrated Circuits
针对热串扰影响可编程光子集成电路精确编程的问题，研究人员提出三种融合不同物理直觉的热串扰预测模型，实现低建模误差，并验证了模型的补偿效果与泛化能力。
M3ICRO: Machine Learning-Enabled Compact Photonic Tensor Core based on PRogrammable Multi-Operand Multimode Interference
针对光子张量核尺寸大、计算密度低的问题，提出基于可编程多操作数多模干涉器件的超紧凑PTC M3ICRO，利用机器学习预测器件行为，结合块展开方法，实现更小面积、更高速度和计算密度，并保持接近数字精度。
Realization of a programmable multi-purpose photonic quantum memory with over-thousand qubit manipulations
本文实现了一种可编程多用途光子量子存储器，可同时存储72个光学量子比特并支持超千次随机访问读写，演示了量子队列、栈、缓冲器及纠缠光子对同步重排，为大规模全功能量子网络提供关键构建模块。
This paper proposes the implementation of programmable threshold logic gate (TLG) crossbar array based on modified TLG cells for high speed processing and computation. The proposed TLG array operation does not depend on input signal and time pulses, comparing to the existing architectures. The circuit is implemented using TSMC $180nm$ CMOS technology. The on-chip area and power dissipation of the simulated $3\times 4$ TLG array is $1463 μm^2$ and $425 μW$, respectively.
Length-Matching Routing for Programmable Photonic Circuits Using Best-First Strategy
本文提出基于最佳优先策略的长度匹配路由方法，通过改进的启发式估计器和剪枝技术，实现精确长度路径搜索，提升光子集成电路的性能与效率。
Provable Routing Analysis of Programmable Photonics
本文从理论角度分析可编程光子集成电路的光路由问题，证明方形网格PPIC上路径长度的可实现性条件，并给出多路径路由的解析表达式与上界，所有结论均经数学证明。
Programming universal unitary transformations on a general-purpose silicon photonics platform
本文首次在六边形拓扑的通用可编程硅光子电路上实现了通用幺正变换编程，通过构建等效马赫-曾德尔干涉仪结构并编程三角形和矩形矩阵乘法架构，对3x3和4x4随机幺正矩阵实验获得超过98%的保真度和5比特以上精度，为光学计算与信号处理应用铺平道路。
Fully Programmable Spatial Photonic Ising Machine by Focal Plane Division
提出基于焦平面分割的完全可编程空间光子伊辛机，通过将伊辛问题分解为Mattis哈密顿量并利用相机传感器多区域光强同时计算能量，实验验证了32自旋模型的高成功率求解，突破了部分可编程性限制。
With photonics, the quantum computational advantage has been demonstrated on the task of boson sampling. Next, developing quantum-enhanced approaches for practical problems becomes one of the top priorities for photonic systems. Quantum walks are powerful kernels for developing new and useful quantum algorithms. Here we realize large-scale quantum walks using a fully programmable photonic quantum computing system. The system integrates a silicon quantum photonic chip, enabling the simulation of quantum walk dynamics on graphs with up to 400 vertices and possessing full programmability over qua…
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