We report the implementation of a perceptron quantum gate in an ion-trap quantum computer. In this scheme, a perceptron's target qubit changes its state depending on the interactions with several qubits. The target qubit displays a tunable sigmoid switching behaviour becoming a universal approximator when nested with other percetrons. The procedure consists on the adiabatic ramp-down of a dressing-field applied to the target qubit. We also use two successive perceptron quantum gates to implement a XNOR-gate, where the perceptron qubit changes its state only when the parity of two input qubits is even. The applicability can be generalized to higher-dimensional gates as well as the reconstruction of arbitrary bounded continuous functions of the perceptron observables.
@article{arxiv.2111.08977,
title = {Realization of a quantum perceptron gate with trapped ions},
author = {P. Huber and J. Haber and P. Barthel and J. J. García-Ripoll and E. Torrontegui and C. Wunderlich},
journal= {arXiv preprint arXiv:2111.08977},
year = {2021}
}