Evaluation of parameterized quantum circuits: on the relation between classification accuracy, expressibility, and entangling capability

Springer Science and Business Media LLC - 2021
Thomas Hubregtsen1, Josef Pichlmeier2, Patrick Stecher3, Koen Bertels2
1BMW Group Research, New Technologies, Innovations, Garching bei, München, Germany
2Delft University of Technology, Delft, Netherlands
3Department of Informatics, Technical University of Munich, Garching bei, München, Germany

Tóm tắt

AbstractAn active area of investigation in the search for quantum advantage is quantum machine learning. Quantum machine learning, and parameterized quantum circuits in a hybrid quantum-classical setup in particular, could bring advancements in accuracy by utilizing the high dimensionality of the Hilbert space as feature space. But is the ability of a quantum circuit to uniformly address the Hilbert space a good indicator of classification accuracy? In our work, we use methods and quantifications from prior art to perform a numerical study in order to evaluate the level of correlation. We find a moderate to strong correlation between the ability of the circuit to uniformly address the Hilbert space and the achieved classification accuracy for circuits that entail a single embedding layer followed by 1 or 2 circuit designs. This is based on our study encompassing 19 circuits in both 1- and 2-layer configurations, evaluated on 9 datasets of increasing difficulty. We also evaluate the correlation between entangling capability and classification accuracy in a similar setup, and find a weak correlation. Future work will focus on evaluating if this holds for different circuit designs.

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