Enhanced Hanbury Brown and Twiss interferometry using parametric amplification Xiaoping Ma, Chenglong You, Sushovit Adhikari, Yongjian Gu, Omar S. Magaña-Loaiza, Jonathan P. Dowling and Hwang Lee EPJ Quantum Technol., 7 1 (2020) 10 Published online: 29 June 2020 DOI: 10.1140/epjqt/s40507-020-00085-5