Multiple photonic systems show great promise for providing practical yet powerful hardware substrates for neuromorphic computing. Among those, delay-based systems offer -through a time-multiplexing technique - a simple technological implementation route. We discuss our advances in the development of passive coherent fibre-ring cavities and semiconductor lasers with integrated delay for reservoir computing. Time-multiplexed systems are also highly suitable for coherent Ising machines as they allow to implement a fully interconnected large scale system with few components. We have recently proposed a system based on opto-electronic oscillators subjected to self-feedback with improved calculation time and solution quality.
Recent experimental results show how classical accelerators based on analog computing can outperform quantum annealing alternatives in benchmark tasks that require dense connection matrices. In Hewlett Packard Labs, we have been studying two alternatives: integrated coherent Ising machines and mem-HNNs (based on memristive crossbar arrays). An important challenge for commercial viability is that different industrial workloads typically benefit from the availability of a variety of optimization algorithms and require a broad range of template combinatorial optimization problems. In this talk, we will discuss our recent progress in going beyond Max-Cut, and we will propose a broader range of algorithms. This flexibility in algorithm choices and template problems is an important step forward to address the wide variety of enterprise-level use-cases such as airline scheduling, supply chain optimization, real-time bandwidth management, gene sequencing, etc.
Coherent Ising machines have been proposed as a promising platform for combinatorial optimization. Initial fiber-based, FPGA-assisted instantiations experimentally outperform quantum annealers based on superconducting qubits in speed and energy-efficiency due their ability to have programmable all-to-all connectivity between the Ising nodes. Since then, multiple flavors of coherent Ising machines have been proposed based on silicon photonics. In this talk, we will compare and contrast these integrated Ising machines with their table-top setup counterparts and their upcoming competitors in digital and analog electronics. Moreover, we will explain how large-scale problems can be mapped to small-scale integrated Ising cores.
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