Observation of two-photon interference with continuous variables by homodyne detection Daohua Wu, Kota Kawamoto, Xiaomin Guo, Katsuyuki Kasai, Masayoshi Watanabe and Yun Zhang Eur. Phys. J. D, 71 10 (2017) 260 Published online: 19 October 2017 DOI: 10.1140/epjd/e2017-80379-y