Connection between memory performance and optical absorption in quantum reservoir computing

• URL: http://arxiv.org/abs/2501.15580v1
• Date: Sun, 26 Jan 2025 16:09:40 GMT
• Title: Connection between memory performance and optical absorption in quantum reservoir computing
• Authors: Niclas Götting, Steffen Wilksen, Alexander Steinhoff, Frederik Lohof, Christopher Gies,
• Abstract summary: dissipation due to material imperfections or coupling to the environment acts as a natural mechanism providing fading memory to reservoir computers. We unravel a connection between the physical metric of optical absorption and the performance of quantum reservoir computers in terms of their short-term memory capacity.
• Score: 39.58317527488534
• License:
• Abstract: The fading memory property is a key requirement for reservoir computers -- a specific type of recurrent neural network with fixed internal weights. While mostly undesired in gate-based quantum computing, dissipation due to material imperfections or coupling to the environment acts as a natural mechanism intrinsically providing fading memory to reservoir computers based on dynamical open quantum systems. In this work, we unravel a connection between the physical metric of optical absorption and the performance of quantum reservoir computers in terms of their short-term memory capacity. We establish this link by considering a coherent input encoding in conjunction with tunable qubit decay, giving precise control over the fading memory in the quantum reservoir computer. Our analysis enables us to identify a sweet-spot regime for the dissipation strength at which memory performance is maximized.

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