논문 해외 국제전문학술지(SCI급) Quantifying non-Gaussianity of a quantum state by the negative entropy of quadrature distributions
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2021-09
- 저자명 Jiyong Park, Jaehak Lee, Kyunghyun Baek, and Hyunchul Nha
- 학술지명 Physical Review A
- 발행처명 American Physical Society
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
We propose a non-Gaussianity measure of a multimode quantum state based on the negentropy of quadrature distributions. Our measure satisfies desirable properties as a non-Gaussianity measure, i.e., faithfulness, invariance under Gaussian unitary operations, and monotonicity under Gaussian channels. Furthermore, we find a quantitative relation between our measure and the previously proposed non-Gaussianity measures defined via quantum relative entropy and the quantum Hilbert-Schmidt distance. This allows us to estimate the non-Gaussianity measures readily by homodyne detection, which would otherwise require a full quantum-state tomography.