Publisher Correction: Coherent Ising machines—optical neural networks operating at the quantum limit. - Yamamoto, Yoshihisa; Aihara, Kazuyuki; Leleu, Timothee; Kawarabayashi, Ken-ichi; Kako, Satoshi; Fejer, Martin; Inoue, Kyo; Takesue, Hiroki (NPJ Quantum Information, 2018)