Quantum reservoir computing is a class of quantum machine learning algorithms involving a reservoir of an echo state network based on a register of qubits, but the dependence of its memory capacity on the hyperparameters is still rather unclear. In order to maximize its accuracy in time–series predictive tasks, we investigate the relation between the memory of the network and the reset rate of the evolution of the quantum reservoir. We benchmark the network performance by three non–linear maps with fading memory on IBM quantum hardware. The memory capacity of the quantum reservoir is maximized for central values of the memory reset rate in the interval . As expected, the memory capacity increases approximately linearly with the number of qubits. After optimization of the memory reset rate, the mean squared errors of the predicted outputs in the tasks may decrease by a factor with respect to previous implementations.

Optimization of the Memory Reset Rate of a Quantum Echo-State Network for Time Sequential Tasks / R. Molteni, C. Destri, E. Prati. - In: PHYSICS LETTERS A. - ISSN 0375-9601. - 465:(2023 Mar 28), pp. 128713.1-128713.9. [10.1016/j.physleta.2023.128713]

Optimization of the Memory Reset Rate of a Quantum Echo-State Network for Time Sequential Tasks

E. Prati
Ultimo
2023

Abstract

Quantum reservoir computing is a class of quantum machine learning algorithms involving a reservoir of an echo state network based on a register of qubits, but the dependence of its memory capacity on the hyperparameters is still rather unclear. In order to maximize its accuracy in time–series predictive tasks, we investigate the relation between the memory of the network and the reset rate of the evolution of the quantum reservoir. We benchmark the network performance by three non–linear maps with fading memory on IBM quantum hardware. The memory capacity of the quantum reservoir is maximized for central values of the memory reset rate in the interval . As expected, the memory capacity increases approximately linearly with the number of qubits. After optimization of the memory reset rate, the mean squared errors of the predicted outputs in the tasks may decrease by a factor with respect to previous implementations.
Quantum echo state network; Quantum machine learning; Quantum reservoir computing
Settore FIS/03 - Fisica della Materia
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
28-mar-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/956862
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