By IQT News posted 17 Feb 2020

(SwissQuantumHub) A team of scientists at MIT and Xanadu has published a paper about quantum classifiers as trainable quantum circuits used as machine learning models.
The first part of the circuit implements a quantum feature map that encodes classical inputs into quantum states, embedding the data in a high-dimensional Hilbert space.
The second part of the circuit executes a quantum measurement interpreted as the output of the model. Usually, the measurement is trained to distinguish quantum-embedded data. They have proposed to instead train the first part of the circuit—the embedding—with the objective of maximally separating data classes in Hilbert space, a strategy they call quantum metric learning.

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