Translation from a Distinguishable to Indistinguishable Two-Photon State
Dongjin Lee, Kyungdeuk Park, Woncheol Shin, Heedeuk Shin · ACS Photonics · 2023
High Resolution Image Download MS PowerPoint Slide Indistinguishability is a crucial element for quantum interference in scalable quantum information processing. Here, we demonstrate the ability to erase the distinguishability of a nondegenerate two-photon state using Bragg-scattering four-wave mixing (BS-FWM) by tuning the idler-photon frequency. We achieve a maximum translation efficiency of 93.2 ± 2.0% and verify the indistinguishability using a Hong–Ou–Mandel interferometer. The frequency anticorrelation of the input state is preserved as the two-photon states are translated from the distinguishable to indistinguishable state, as confirmed by the joint spectral intensity. Our results demonstrate precise control of indistinguishability using BS-FWM, which is a critical step toward large-scale quantum information processing including scalable linear quantum computing and long-distance quantum communications.