논문 해외 국제전문학술지(SCI급) Estimating Non-Gaussianity of a Quantum State by Measuring Orthogonal Quadratures
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2022-02
- 저자명 Jiyong Park
- 학술지명 Entropy
- 발행처명 MDPI
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 1
홈페이지논문 초록 (Abstract)
We derive the lower bounds for a non-Gaussianity measure based on quantum relative entropy (QRE). Our approach draws on the observation that the QRE-based non-Gaussianity measure of a single-mode quantum state is lower bounded by a function of the negentropies for quadrature distributions with maximum and minimum variances. We demonstrate that the lower bound can outperform the previously proposed bound by the negentropy of a quadrature distribution. Furthermore, we extend our method to establish lower bounds for the QRE-based non-Gaussianity measure of a multimode quantum state that can be measured by homodyne detection, with or without leveraging a Gaussian unitary operation. Finally, we explore how our lower bound finds application in non-Gaussian entanglement detection.