Efficient Discrete Feature Encoding for Variational Quantum Classifier

Hiroshi Yano, Yudai Suzuki, Kohei M. Itoh, Rudy Raymond, Naoki Yamamoto

研究成果: Article査読

17 被引用数 (Scopus)


Recent days have witnessed significant interests in applying quantum-enhanced techniques for solving a variety of machine learning tasks. Variational methods that use quantum resources of imperfect quantum devices with the help of classical computing techniques are popular for supervised learning. Variational quantum classification (VQC) is one of such methods with possible quantum advantage in using quantum-enhanced features that are hard to compute by classical methods. Its performance depends on the mapping of classical features into a quantum-enhanced feature space. Although there have been many quantum-mapping functions proposed so far, there is little discussion on efficient mapping of discrete features, such as age group, zip code, and others, which are often significant for classifying datasets of interest. We first introduce the use of quantum random-access coding (QRAC) to map such discrete features efficiently into limited number of qubits for VQC. In numerical simulations, we present a range of encoding strategies and demonstrate their limitations and capabilities. We experimentally show that QRAC can help speeding up the training of VQC by reducing its parameters via saving on the number of qubits for the mapping. We confirm the effectiveness of the QRAC in VQC by experimenting on classification of real-world datasets with both simulators and real quantum devices.

ジャーナルIEEE Transactions on Quantum Engineering
出版ステータスPublished - 2021

ASJC Scopus subject areas

  • ソフトウェア
  • コンピュータ サイエンス(その他)
  • 凝縮系物理学
  • 工学(その他)
  • 機械工学
  • コンピュータ サイエンスの応用
  • 電子工学および電気工学


「Efficient Discrete Feature Encoding for Variational Quantum Classifier」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。